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NSR database version of April 11, 2024.

Search: Author = U.Koster

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2024CH10      Appl.Radiat.Isot. 205, 111174 (2024)

M.Chojnacki, K.Kulesz, I.Michelon, N.Azaryan, E.Barbero, B.Crepieux, R.Lica, L.Murawski, M.Ziemba, M.Piersa-Silkowska, K.Vitulova, A.Korgul, R.B.Jolivet, R.Prokopowicz, U.Koster, M.Kowalska

Production of 129mXe and 131mXe via neutron activation of 128Xe and 130Xe at ILL-RHF and NCBJ-MARIA high-flux reactors

NUCLEAR REACTIONS 128,130Xe(n, γ), E thermal; measured reaction products, Eγ, Iγ; deduced yields, σ. Comparison with available data. The high-flux reactor MARIA located at the National Centre for Nuclear Research (NCBJ) in Swierk, Poland.

doi: 10.1016/j.apradiso.2024.111174
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2024KN01      Phys.Rev. C 109, 014313 (2024)

L.Knafla, K.Nomura, A.Esmaylzadeh, A.Harter, J.Jolie, V.Karayonchev, Y.H.Kim, U.Koster, M.Ley, C.Michelagnoli, A.Pfeil, J.-M.Regis, F.von Spee

Investigating the prolate-to-oblate shape phase transition: Lifetime measurements and γ spectroscopy of the low-lying negative parity structure in 193Os

doi: 10.1103/PhysRevC.109.014313
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2024KU05      Phys.Rev. C 109, 024304 (2024)

D.Kumar, A.Pal, S.Basak, T.Bhattacharjee, S.S.Alam, L.Gerhard, L.Knafla, A.Esmaylzadeh, M.Ley, F.Dunkel, K.Schomaker, J.-M.Regis, J.Jolie, Y.H.Kim, U.Koster

Lifetime measurement for the 15/2-1 and 13/2-1 levels in 129Sn

doi: 10.1103/PhysRevC.109.024304
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2024YU02      Phys.Lett. B 849, 138452 (2024)

Z.Yue, A.N.Andreyev, A.E.Barzakh, I.N.Borzov, J.G.Cubiss, A.Algora, M.Au, M.Balogh, S.Bara, R.A.Bark, C.Bernerd, M.J.G.Borge, D.Brugnara, K.Chrysalidis, T.E.Cocolios, H.De Witte, Z.Favier, L.M.Fraile, H.O.U.Fynbo, A.Gottardo, R.Grzywacz, R.Heinke, A.Illana, P.M.Jones, D.S.Judson, A.Korgul, U.Koster, M.Labiche, L.Le, R.Lica, M.Madurga, N.Marginean, B.Marsh, C.Mihai, E.Nacher, C.Neacsu, C.Nita, B.Olaizola, J.N.Orce, C.A.A.Page, R.D.Page, J.Pakarinen, P.Papadakis, G.Penyazkov, A.Perea, M.Piersa-Silkowska, Zs.Podolyak, S.D.Prosnyak, E.Reis, S.Rothe, M.Sedlak, L.V.Skripnikov, C.Sotty, S.Stegemann, O.Tengblad, S.V.Tolokonnikov, J.M.Udias, P.Van Duppen, N.Warr, W.Wojtaczka

Magnetic moments of thallium isotopes in the vicinity of magic N=126

NUCLEAR MOMENTS 207,209Tl; measured frequencies; deduced magnetic dipole moments. Comparison with the self-consistent theory of finite Fermi systems based on the energy density functional. The in-source laser resonance-ionization spectroscopy technique with the Laser Ion Source and Trap (LIST) at ISOLDE (CERN).

doi: 10.1016/j.physletb.2024.138452
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2023AU02      Phys.Rev. C 107, 064604 (2023)

M.Au, M.Athanasakis-Kaklamanakis, L.Nies, R.Heinke, K.Chrysalidis, U.Koster, P.Kunz, B.Marsh, M.Mougeot, L.Schweikhard, S.Stegemann, Y.Vila Gracia, Ch.E.Dullmann, S.Rothe

Production of neptunium and plutonium nuclides from uranium carbide using 1.4-GeV protons

NUCLEAR REACTIONS U(p, X)235Np/236Np/237Np/238Np/239Np/240Np/241Np/235Pu/236Pu/237Pu/238Pu/239Pu/240Pu/241Pu, E=1.4 GeV; measured reaction products using resonance ionization laser ion source (RILIS), general purpose separator (GPS), and ISOLTRAP multireflection time-of-flight mass spectrometer (MR-ToF MS) at CERN-ISOLDE facility. 234,237,236,239,240U, 231,232,233,234,235,236,237,238,239,240,241Np, 235,236,237,238,239,240,241Pu; calculated production yields by inelastic reactions and through decays of precursors: 234,236,237Pa, 231,233,235Pu, 237,239,240U, 235Am, 235,236,238,239,240,241Np using GEANT4 QGSP_INCLXX+ABLA code. Comparison with predictions of GEANT4 and FLUKA simulations; discussed limit of accelerator-based isotope production at high-energy proton accelerator facilities for nuclides in the actinide region.

ATOMIC PHYSICS 236,237,239Np, 236,239,240Pu; measured isotope shifts for the 395.6-nm ground-state transition in Np isotopes, and for the 413.4-nm ground-state transition in Pu isotopes by two-step ionization schemes using intra-cavity doubled Ti:Sa lasers to resonantly ionize Np and Pu isotopes.

doi: 10.1103/PhysRevC.107.064604
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2023BO01      Phys.Rev. C 107, 014322 (2023)

S.Bottoni, E.R.Gamba, G.De Gregorio, A.Gargano, S.Leoni, B.Fornal, N.Brancadori, G.Ciconali, F.C.L.Crespi, N.Cieplicka-Orynczak, L.W.Iskra, G.Colombi, Y.H.Kim, U.Koster, C.Michelagnoli, F.Dunkel, A.Esmaylzadeh, L.Gerhard, J.Jolie, L.Knafla, M.Ley, J.-M.Regis, K.Schomaker, M.Sferrazza

Testing the predictive power of realistic shell model calculations via lifetime measurement of the 11/2+ state in 131Sb

NUCLEAR REACTIONS 235U(n, F)131Sb, E=thermal; measured fission fragments, Eγ, Iγ, γγ-coin, (fragment)γ-coin. 131Sb; deduced levels, J, π, T1/2 for transitions from excited states, B(E2). Lifetimes obtained with generalized centroid difference (GCD) method. Systematics of 2+ states energies in Sn isotopes compared with 11/2+ states in Sb isotopes. Comparison to realistic shell-model calculations performed with KSHELL code. LOHENGRIN spectrometer together with 2 HPGe and 5 LaBr3(Ce) detectors (ILL).

doi: 10.1103/PhysRevC.107.014322
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2023CO11      Appl.Radiat.Isot. 202, 111044 (2023)

S.M.Collins, U.Koster, A.P.Robinson, P.Ivanov, T.E.Cocolios, B.Russell, A.J.Fenwick, C.Bernerd, S.Stegemann, K.Johnston, A.M.Gerami, K.Chrysalidis, H.Mohamud, N.Ramirez, A.Bhaisare, J.Mewburn-Crook, D.M.Cullen, B.Pietras, S.Pells, K.Dockx, N.Stucki, P.H.Regan

Determination of the Terbium-152 half-life from mass-separated samples from CERN-ISOLDE and assessment of the radionuclide purity

RADIOACTIVITY 152Tb(EC), (β+); measured decay products, Eγ, Iγ, Eβ, Iβ; deduced T1/2 by three independent techniques from mass-separated samples. Comparison with available data. Two mass-separated samples from the CERN-ISOLDE facility have been assayed at the National Physical Laboratory.

doi: 10.1016/j.apradiso.2023.111044
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2023GA30      Phys.Rev. C 108, 064301 (2023)

E.R.Gamba, S.Bottoni, L.W.Iskra, C.Zavaglia, S.Leoni, B.Fornal, N.Cieplicka-Orynczak, G.Benzoni, G.Colombi, F.C.L.Crespi, A.Esmaylzadeh, M.Jentschel, J.Jolie, V.Karayonchev, Y.H.Kim, L.Knafla, U.Koster, M.Ley, N.Marginean, R.Marginean, C.Michelagnoli, M.Polettini, C.Porzio, J-.M.Regis, D.Reygadas, A.Turturica

Lifetime measurements in 96Rb via fast-timing techniques: Investigating shape coexistence at A ∼ 100

doi: 10.1103/PhysRevC.108.064301
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2023JU01      Appl.Radiat.Isot. 202, 111058 (2023)

F.Juget, M.van Dijk, E.A.Maugeri, M.Schumann, S.Heinitz, A.Boyarsky, U.Koster, L.Shchutska, C.Bailat

Measurement of the 171Tm beta spectrum

RADIOACTIVITY 171Tm(β-); measured decay products, Eβ, Iβ; deduced beta spectrum shape, Kurie plot, Q-value. Comparison with ENSDF library. The double focalizing magnetic spectrometer, Institute of Radiation Physics built by a company, Bruker GmbH (Karksruhe, Germany).

doi: 10.1016/j.apradiso.2023.111058
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2023KR02      Nature(London) 617, 706 (2023)

S.Kraemer, J.Moens, M.Athanasakis-Kaklamanakis, S.Bara, K.Beeks, P.Chhetri, K.Chrysalidis, A.Claessens, T.E.Cocolios, J.G.M.Correia, H.De Witte, R.Ferrer, S.Geldhof, R.Heinke, N.Hosseini, M.Huyse, U.Koster, Y.Kudryavtsev, M.Laatiaoui, R.Lica, G.Magchiels, V.Manea, C.Merckling, L.M.C.Pereira, S.Raeder, T.Schumm, S.Sels, P.G.Thirolf, S.M.Tunhuma, P.Van Den Bergh, P.Van Duppen, A.Vantomme, M.Verlinde, R.Villarreal, U.Wahl

Observation of the radiative decay of the 229Th nuclear clock isomer

RADIOACTIVITY 229Ac(β-), 229Th(IT) [from U(p, X), E=1.4 GeV]; measured decay products, Eγ, Iγ; deduced isomeric transition energies and T1/2. Comparison with available data. The ISOLDE facility at CERN.

doi: 10.1038/s41586-023-05894-z
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2023NI10      Phys.Rev.Lett. 131, 222503 (2023)

L.Nies, L.Canete, D.D.Dao, S.Giraud, A.Kankainen, D.Lunney, F.Nowacki, B.Bastin, M.Stryjczyk, P.Ascher, K.Blaum, R.B.Cakirli, T.Eronen, P.Fischer, M.Flayol, V.Girard Alcindor, A.Herlert, A.Jokinen, A.Khanam, U.Koster, D.Lange, I.D.Moore, M.Muller, M.Mougeot, D.A.Nesterenko, H.Penttila, C.Petrone, I.Pohjalainen, A.de Roubin, V.Rubchenya, Ch.Schweiger, L.Schweikhard, M.Vilen, J.Aysto

Further Evidence for Shape Coexistence in 79Znm near Doubly Magic 78Ni

ATOMIC MASSES 79Zn; measured frequencies, TOF; deduced the excitation energy of the 1/2+ isomer, the bandhead of a low-lying deformed structure akin to a predicted low-lying deformed band, shape coexistence. Comparison with state-of-the-art shell-model diagonalizations, complemented with discrete nonorthogonal shell-model calculations. The time-of-flight ion cyclotron resonance (TOF-ICR) method, the JYFLTRAP double Penning trap at the ion guide isotope separator on-line (IGISOL) facility in Jyvaskyla (Finland), and the multi-reflection time-of-flight mass spectrometer (MR-TOF MS) of ISOLTRAP at ISOLDE at CERN (Switzerland).

doi: 10.1103/PhysRevLett.131.222503
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2023PF03      Phys.Rev. C 108, 034310 (2023)

A.Pfeil, K.Nomura, N.Gavrielov, J.-M.Regis, U.Koster, Y.H.Kim, A.Esmaylzadeh, A.Harter, J.Jolie, L.Knafla, M.Ley, V.Karayonchev

Lifetime measurements in 99Nb and 99Zr: Investigation of shape coexistence

doi: 10.1103/PhysRevC.108.034310
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2023RZ01      Phys.Rev. C 108, 014324 (2023)

T.Rzaca-Urban, W.Urban, A.Blanc, M.Jentschel, P.Mutti, U.Koster, G.de France, G.S.Simpson, C.A.Ur

Low-spin excitations in 95Zr

NUCLEAR REACTIONS 94Zr(n, γ), 235U(n, F)95Zr, E=cold neutrons; measured Eγ, Iγ γγ-coin, γγγ-coin, γγ(θ). 95Zr; deduced levels, J, π, transition intensities, γ-transition branchings, angular correlation coefficients. Comparison of low-spin excitations of 94Zr, 95Zr, 96Zr, 97Zr. EXILL array of 16 large HPGe detectors at the PF1B facility of ILL-Grenoble.

RADIOACTIVITY 95Y(β-)[from 235U(n, F), E=cold neutrons]; measured Eγ, Iγ γγ-coin, γγγ-coin, γγ(θ). 95Zr; deduced levels, J, π, transition intensities, γ-transition branchings, angular correlation coefficients. EXILL array of 16 large HPGe detectors at the PF1B facility of ILL-Grenoble.

doi: 10.1103/PhysRevC.108.014324
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2023WE04      Phys.Rev. C 107, 034313 (2023)

F.Weber, T.E.Albrecht-Schonzart, S.O.Allehabi, S.Berndt, M.Block, H.Dorrer, C.E.Dullmann, V.A.Dzuba, J.G.Ezold, V.V.Flambaum, V.Gadelshin, S.Goriely, A.Harvey, R.Heinke, S.Hilaire, M.Kaja, T.Kieck, N.Kneip, U.Koster, J.Lantis, C.Mokry, D.Munzberg, S.Nothhelfer, S.Oberstedt, S.Peru, S.Raeder, J.Runke, V.Sonnenschein, M.Stemmler, D.Studer, P.Thorle-Pospiech, H.Tomita, N.Trautmann, S.Van Cleve, J.Warbinek, K.Wendt

Nuclear moments and isotope shifts of the actinide isotopes 249-253Cf probed by laser spectroscopy

NUCLEAR MOMENTS 249,250,251,252,253Cf; measured hyperfine spectra; deduced energy positions of three atomic ground-state transitions, isotope shifts. 249,251,253Cf; deduced nuclear magnetic dipole moments, hyperfine parameters. 249,253Cf; deduced spectroscopic quadrupole moments. Comparison with previous experimental data. Laser resonance ionisation high-resolution spectroscopy. Comparison to theoretical estimations. RISIKO mass separator at Johannes Gutenberg University Mainz.

doi: 10.1103/PhysRevC.107.034313
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2023WI04      Phys.Rev. C 108, 024302 (2023)

J.Wisniewski, W.Urban, T.Rzaca-Urban, K.Sieja, A.Blanc, M.Jentschel, C.Micheagnoli, P.Mutti, U.Koster, G.de France, G.S.Simpson, C.A.Ur

Structure of N=56 isotones with 36 ≤ Z ≤ 42 protons

NUCLEAR REACTIONS 235U(n, F)92Kr/96Zr, E = thermal; 97Mo(n, γ), E = thermal; measured Eγ, Iγ, γγ-coin, γγ(θ). 92Kr, 96Zr, 98Mo; deduced levels, J, π, angular correlation coefficients, linear polarization, high-spin states, δ, configurations. 92Kr; calculated occupation of neutron and proton orbitals. Systematics of low-spin level structures for N=56 isotones (Se, Kr, Sr, Zr, Mo, Ru, Pd). Comparison to large-scale shell-model (LSSM) calculations for 92Kr. EXILL array of 16 large Ge detectors including eight clover detectors in one plane with an octagonal geometry was used for experiment in which 92Kr and 96Zr were measured, while for 98Mo - FIPPS array of 8 HPGe detectors mounted in an octagonal geometry was used.

doi: 10.1103/PhysRevC.108.024302
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2022CO10      Appl.Radiat.Isot. 190, 110480 (2022)

S.M.Collins, A.P.Robinson, P.Ivanov, U.Koster, T.E.Cocolios, B.Russell, B.Webster, A.J.Fenwick, C.Duchemin, J.P.Ramos, E.Chevallay, U.Jakobsson, S.Stegemann, P.H.Regan, T.Stora

Half-life determination of 155Tb from mass-separated samples produced at CERN-MEDICIS

RADIOACTIVITY 155Tb(EC) [from Ta(p, X), E=1.4 GeV]; measured decay products, Eγ, Iγ; deduced T1/2. Comparison with available data. The Proton Synchrotron Booster accelerator at CERN, the target foil was delivered to NPL.

doi: 10.1016/j.apradiso.2022.110480
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2022FR01      Astropart.Phys. 138, 102686 (2022)

F.M.Frankle, A.Schaller, K.Blaum, L.Bornschein, G.Drexlin, F.Gluck, V.Hannen, F.Harms, D.Hinz, K.Johnston, J.Karthein, U.Koster, A.Lokhov, S.Mertens, F.Muller, A.Osipowicz, P.C.-O.Ranitzsch, K.Schlosser, T.Thummler, N.Trost, C.Weinheimer, J.Wolf

KATRIN background due to surface radioimpurities

RADIOACTIVITY 211,212Pb(β-); measured decay products, Eβ, Iβ; deduced T1/2 and uncertainties. Comparison with available data.

doi: 10.1016/j.astropartphys.2022.102686
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2022KN02      Nucl.Instrum.Methods Phys.Res. A1042, 167463 (2022)

L.Knafla, A.Esmaylzadeh, A.Harter, J.Jolie, U.Koster, M.Ley, C.Michelagnoli, J.-M.Regis

Development of a new γ-γ angular correlation analysis method using a symmetric ring of clover detectors

RADIOACTIVITY 177Lu, 152Eu(β-); measured decay products, Eγ, Iγ, γ-γ-coin.; deduced γ-ray energies, multipole mixing ratios using different configurations of the FIPPS instrument. Comparison with available data.

NUCLEAR REACTIONS 115Sn(n, γ)116Sn, E thermal; measured reaction products, Eγ, Iγ, γ-γ-coin.; deduced γ-ray energies, multipole mixing ratios. The Institut Laue-Langevin, using the EXILL and FATIMA spectrometer.

doi: 10.1016/j.nima.2022.167463
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2022KU31      Phys.Rev. C 106, 034306 (2022)

D.Kumar, T.Bhattacharjee, S.S.Alam, S.Basak, L.Gerhard, L.Knafla, A.Esmaylzadeh, M.Ley, F.Dunkel, K.Schomaker, J.-M.Regis, J.Jolie, Y.H.Kim, U.Koster, G.S.Simpson, L.M.Fraile

Lifetimes and transition probabilities for low-lying yrast levels in 130, 132Te

RADIOACTIVITY 130,132Sb(β-); 130m,132mTe(IT) [from 233U(n, γ), E=thermal, followed by mass-separation of fission fragments by the Lohengrin separator at Institut Laue-Langevin, Grenoble]; measured Eγ, Iγ, γγ-coin, isomer and level T1/2 by γ(t) and γγ(t) fast-timing method using four LaBr3(Ce) detectors and two Clover HPGe detectors, and analyzed using generalized centroid difference (GCD) method, and by slope method. 130,132Te; deduced levels, T1/2 of levels and isomers, B(E2) for yrast members of the g.s. bands up to 10+, configurations. Comparison with large-basis shell model calculations, and with previous experimental results. Systematics of B(E2) values for g.s. band members up to 10+ for 126,128,130,132,134Te.

doi: 10.1103/PhysRevC.106.034306
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2022SI16      Phys.Rev. C 106, 014302 (2022)

M.Si, R.Lozeva, H.Naidja, A.Blanc, J.-M.Daugas, F.Didierjean, G.Duchene, U.Koster, T.Kurtukian-Nieto, F.Le Blanc, P.Mutti, M.Ramdhane, W.Urban

New β-decay spectroscopy of the 137Te nucleus

RADIOACTIVITY 137Te(β-), (β-n)[from 235U(n, F), E=thermal at the high flux reactor of Institut Laue-Langevin (ILL), followed by separation of fragments using LOHENGRIN separator]; measured Eγ, Iγ, γγ-coin, βγ-coin using two clover Ge detectors surrounded by BGO anti-Compton shields, and a coaxial HPGe detector for γ radiation, and plastic scintillators for β radiation. 137I; deduced levels, J, π, β feedings, logft, shell-model configurations and wave function amplitudes. 136I; deduced one level at 87.3 keV through the observation of g.s. transition. 137Te; measured T1/2 of its decay by time distribution of β-decay events; estimated lower limit of %β-n or Pn decay mode. Comparison of level structure of 137I with theoretical shell-model (SM) calculations.

doi: 10.1103/PhysRevC.106.014302
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2022TO11      Appl.Radiat.Isot. 190, 110508 (2022)

M.Tosato, M.Asti, V.Di Marco, M.L.Jensen, J.Schell, T.T.Dang, U.Koster, M.Jensen, L.Hemmingsen

Towards in vivo applications of 111Ag perturbed angular correlation of γ-rays (PAC) spectroscopy

RADIOACTIVITY 111Ag(β-) [from 110Pd(n, γ), E not given]; measured frequencies; deduced fitting parameters, PAC spectra.

doi: 10.1016/j.apradiso.2022.110508
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2022VE01      Phys.Rev. C 105, 034338 (2022)

M.Venhart, A.N.Andreyev, J.G.Cubiss, J.L.Wood, A.E.Barzakh, C.Van Beveren, T.E.Cocolios, R.P.de Groote, D.V.Fedorov, V.N.Fedosseev, R.Ferrer, D.A.Fink, L.Ghys, M.Huyse, U.Koster, J.Lane, V.Liberati, K.M.Lynch, B.A.Marsh, P.L.Molkanov, T.J.Procter, E.Rapisarda, K.Sandhu, M.D.Seliverstov, A.M.Sjodin, P.Van Duppen, M.Veselsky

Decay modes of the 9/2- isomeric state in 183Tl

RADIOACTIVITY 183mTl(IT), (α)[from U(p, F), E=1.4 GeV]; measured Eg, Iγ, ce, Eα, Iα, γγ-coin, ceγ-coin, αγ-coin; deduced branching ratios, T1/2, reduced transition widths and hindrance factor for α-decay branch. 183Tl; deduced levels, J, π, δ, ICC, B(E3). Systematics of 9/2- isomers in neutron-deficient odd-mass Tl isotopes. Comparison to 182mHg decay and other experimental data. Selective laser resonance ionization and mass separation at ISOLDE (CERN).

doi: 10.1103/PhysRevC.105.034338
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2021BO02      Phys.Rev. C 103, 014320 (2021)

S.Bottoni, N.Cieplicka-Orynczak, S.Leoni, B.Fornal, G.Colo, P.F.Bortignon, G.Bocchi, D.Bazzacco, G.Benzoni, A.Blanc, A.Bracco, S.Ceruti, F.C.L.Crespi, G.de France, E.R.Gamba, L.W.Iskra, M.Jentschel, U.Koster, C.Michelagnoli, B.Million, D.Mengoni, P.Mutti, Y.Niu, C.Porzio, G.Simpson, T.Soldner, B.Szpak, A.Turler, C.A.Ur, W.Urban

Low-spin particle-core and hole-core excitations in 41, 47, 49Ca isotopes studied by cold-neutron-capture reactions

NUCLEAR REACTIONS 40,46,48Ca(n, γ), E=cold neutrons from High Flux Reactor of ILL-Grenoble; measured Eγ, Iγ, γγ-coin, γγ(θ) using EXILL array of eight clover detectors from the EXOGAM setup, six coaxial detectors from the GASP array, and two ILL clover detectors. 41,47,49Ca; deduced levels, J, π, γ branching ratios, multipolarities, mixing ratios, S(n), configurations. Comparison with self-consistent beyond-mean-field calculations using hybrid configuration mixing model, based on a Skyrme SkX Hamiltonian.

NUCLEAR STRUCTURE 41,47,49Ca; calculated levels, J, π, wave functions and corresponding squared amplitudes, B(E3), spectroscopic factors for 49Ca levels populated in (d, p) reaction using self-consistent beyond-mean-field calculations in a hybrid configuration mixing model, based on a Skyrme SkX Hamiltonian. Comparison with experimental data.

doi: 10.1103/PhysRevC.103.014320
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2021CH64      Eur.Phys.J. A 57, 335 (2021)

A.Chebboubi, G.Kessedjian, O.Serot, H.Faust, U.Koster, O.Litaize, C.Sage, A.Blanc, D.Bernard, A.Letourneau, T.Materna, O.Meplan, P.Mutti, M.Rapala, M.Ramdhane

Measurements of 233U(nth, f) fission product mass yields with the LOHENGRIN recoil mass spectrometer

NUCLEAR REACTIONS 233U(n, F), E thermal; measured reaction products; deduced fission product mass yields, mean and total kinetic energies. Comparison with ENDF/B-VIII.0 and JEFF-3.3 libraries. The LOHENGRIN recoil mass spectrometer of the ILL.

doi: 10.1140/epja/s10050-021-00645-y
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2021DE09      Phys.Rev. C 103, 044322 (2021)

A.Dey, D.C.Biswas, A.Chakraborty, S.Mukhopadhyay, A.K.Mondal, L.S.Danu, B.Mukherjee, S.Garg, B.Maheshwari, A.K.Jain, A.Blanc, G.de France, M.Jentschel, U.Koster, S.Leoni, P.Mutti, G.Simpson, T.Soldner, C.A.Ur, and W.Urban

Measurement of relative isotopic yield distribution of even-even fission fragments from 235U(nth, f) following γ-ray spectroscopy

NUCLEAR REACTIONS 235U(n, F)86Se/88Se/88Kr/90Kr/92Kr/92Sr/94Sr/96Sr/96Zr/98Zr/100Zr/102Zr/104Mo/106Mo/130Sn/132Sn/132Te/136Xe/138Xe/140Xe/144Ba/146Ba/144Ce, E=thermal; measured Eγ, Iγ, γγ- and γγγ-coin using the EXILL array of eight EXOGAM Clover detectors, six large coaxial detectors from GASP, and two clovers at ILL-Grenoble for γ detection; deduced relative isotopic yield distributions of the even-even neutron-rich fission fragments. Z=34-54, A=86-142; assigned values of the third component of isospins T3 and total isospins for all the possible even-even fission fragments produced in the 235U(n, F), E=thermal reaction. Comparison with theoretical calculations using the semiempirical GEF model, and isospin conservation (ISCF) approach.

doi: 10.1103/PhysRevC.103.044322
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2021DU15      Appl.Radiat.Isot. 176, 109893 (2021)

M.T.Duran, F.Juget, Y.Nedjadi, F.Bochud, Z.Talip, N.P.van der Meulen, U.Koster, C.Duchemin, T.Stora, C.Bailat

Ytterbium-175 half-life determination

RADIOACTIVITY 175Yb(β-) [from 174Yb(n, γ), E thermal]; 99mTc(IT), (β-) [from 99Mo radionuclide generator PERTECTOR]; measured decay products, Eγ, Iγ; deduced T1/2 and uncertainties. Comparison with available data, ENSDF database.

doi: 10.1016/j.apradiso.2021.109893
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2021DU19      Phys.Rev. C 104, 034621 (2021)

S.Dubey, A.Echler, P.Egelhof, P.Grabitz, W.Lauterfeld, M.Mutterer, S.Stolte, A.Blanc, U.Koster, O.Serot, G.Kessedjian, S.Kraft-Bermuth, P.Scholz, S.Bishop, J.M.Gomez-Guzman, F.Gonnenwein

Isotopic distributions of thermal-neutron-induced fission fragments of near-symmetric fission of 239, 241Pu determined using calorimetric low-temperature detectors

NUCLEAR REACTIONS 239,241Pu(n, F)89Se/89Br/90Br/91Br/89Kr/90Kr/91Kr/92Kr/93Kr/94Kr/95Kr/89Rb/90Rb/91Rb/92Rb/93Rb/94Rb/95Rb/96Rb/97Rb/90Sr/91Sr/92Sr/93Sr/94Sr/95Sr/96Sr/97Sr/98Sr/99Sr/100Sr/93Y/94Y/95Y/96Y/97Y/98Y/99Y/100Y/101Y/102Y/96Zr/97Zr/98Zr/99Zr/100Zr/101Zr/102Zr/103Zr/104Zr/105Zr/98Nb/99Nb/100Nb/101Nb/102Nb/103Nb/104Nb/105Nb/106Nb/101Mo/102Mo/103Mo/104Mo/105Mo/106Mo/107Mo/108Mo/109Mo/104Tc/105Tc/106Tc/107Tc/108Tc/109Tc/110Tc/111Tc/112Tc/106Ru/107Ru/108Ru/109Ru/110Ru/111Ru/112Ru/109Rh/110Rh/111Rh/112Rh/112Pd/113Rh/113Pd, E=thermal; measured particle energies, and isotopic distributions for the light fission fragments in A=89-112, Z=36-45 asymmetric to symmetric fission region using calorimetric low-temperature detectors (CLTDs) and the LOHENGRIN spectrometer of the ILL, Grenoble high flux reactor; deduced fractional independent yields, independent yields, charge polarization as a function of the secondary mass, local proton odd-even effect versus nuclear charge number Z, virtual shell effect near Z=44, in analogy to the effect of the Z=50 shell in the complementary heavy fragment group of 239,241Pu. Comparison with previous experimental data.

doi: 10.1103/PhysRevC.104.034621
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2021DU23      Appl.Radiat.Isot. 178, 109983 (2021)

C.Duchemin, T.E.Cocolios, K.Dockx, G.J.Farooq-Smith, O.Felden, R.Formento-Cavaier, R.Gebel, U.Koster, B.Neumaier, B.Scholten, I.Spahn, S.Spellerberg, M.E.Stamati, S.Stegemann, H.Verhoeven

Production cross-section measurements of proton-induced reactions on natural tantalum in the 0.3 GeV-1.7 GeV energy range

NUCLEAR REACTIONS Ta(p, X)116Te/123I/153Dy/158Er, E=0.3-1.7 GeV; measured reaction products, Eγ, Iγ. 110,111In, 115,118Sb, 116,117,119Te, 123I, 123,127Xe, 127,129Cs, 126,128,131Ba, 132La, 132,133,135,139Ce, 138Pr, 136,139Nd, 145,147Eu, 146,147,149,153Gd, 147,148,149,151,153,155Tb, 152,153,155Dy, 156Ho, 157,158,159,161Er, 163,165,167Tm, 162,169Yb, 167,169Yb, 170,171,172,173Lu, 170,172,173,175,180Hf, 173,174,175,176,177,178,180Ta, 175,177W; deduced cumulative σ and uncertainties. Comparison with available data. COSY synchrotron at Julich.

doi: 10.1016/j.apradiso.2021.109983
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2021MA62      Phys.Lett. B 820, 136569 (2021)

K.R.Mashtakov, V.Yu.Ponomarev, M.Scheck, S.W.Finch, J.Isaak, M.Zweidinger, O.Agar, C.Bathia, T.Beck, J.Beller, M.Bowry, R.Chapman, M.M.R.Chishti, U.Friman-Gayer, L.P.Gaffney, P.E.Garrett, E.T.Gregor, J.M.Keatings, U.Koster, B.Loher, A.D.MacLean, D.O'Donnell, H.Pai, N.Pietralla, G.Rainovski, M.Ramdhane, C.Romig, G.Rusev, D.Savran, G.S.Simpson, J.Sinclair, K.Sonnabend, P.Spagnoletti, A.P.Tonchev, W.Tornow

Structure of high-lying levels populated in the 96Y → 96Zr β decay

RADIOACTIVITY 96Y(β-) [from 235U(n, F), E thermal]; measured decay products, Eγ, Iγ, Eβ, Iβ; deduced γ-ray energies, B(E1), branching ratios, Gamow-Teller transition probabilities B(GT). Quasiparticle Phonon Model. Institut Laue Langevin (ILL), LOHENGRIN separator.

doi: 10.1016/j.physletb.2021.136569
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2021NY01      Phys.Rev. C 103, 034304 (2021)

B.M.Nyako, J.Timar, M.Csatlos, Zs.Dombradi, A.Krasznahorkay, I.Kuti, D.Sohler, T.G.Tornyi, M.Czerwinski, T.Rzaca-Urban, W.Urban, P.Baczyk, L.Atanasova, D.L.Balabanski, K.Sieja, A.Blanc, M.Jentschel, U.Koster, P.Mutti, T.Soldner, G.de France, G.S.Simpson, C.A.Ur

Medium-spin states of the neutron-rich nucleus 87Br

NUCLEAR REACTIONS 235U(n, F), E=cold neutrons; measured Eγ, Iγ, γγ-coin, (γ rays from complementary fission fragments of 146,147La)γγ-coin, γγ(θ) using EXILL array of Ge detectors at the PF1B facility of ILL-Grenoble. 87Br; deduced high-spin levels, J, π, bands, γ-ray branching ratios, multipolarities, mixing ratios, configurations; calculated levels, J, π, bands, proton and neutron occupations of excited states using shell-model. Comparison of 9/2+ band in 87Br with g.s. bands of 86Se and 88Kr.

doi: 10.1103/PhysRevC.103.034304
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2021NY02      Phys.Rev. C 104, 054305 (2021)

B.M.Nyako, J.Timar, M.Csatlos, Zs.Dombradi, A.J.Krasznahorkay, I.Kuti, D.Sohler, T.G.Tornyi, M.Czerwinski, T.Rzaca-Urban, W.Urban, L.Atanasova, D.L.Balabanski, K.Sieja, A.Blanc, G.de France, M.Jentschel, U.Koster, P.Mutti, G.S.Simpson, T.Soldner, C.A.Ur

Observation of excited states in the neutron-rich nucleus 89Br

NUCLEAR REACTIONS 235U(n, F), E=cold neutrons; measured Eγ, Iγ, γγ-coin, (γ rays from complementary fission fragments 144,145La)γγ-coin, using EXILL array of Ge detectors at the PF1B facility of ILL-Grenoble. 89Br; deduced high-spin levels, J, π, g9/2 band, γ-ray branching ratios for one level, configurations, evolution of collectivity in this mass region. Comparison with large valence-space shell-model calculations, and with experimental levelstructure in 87Br investigated by 2021Ny01: Phys. Rev. C 103, 034304. 144,145La; observed γ rays.

doi: 10.1103/PhysRevC.104.054305
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2021SE17      Phys.Rev. C 104, 024317 (2021)

S.Sekal, L.M.Fraile, R.Lica, M.J.G.Borge, W.B.Walters, A.Aprahamian, C.Benchouk, C.Bernards, J.A.Briz, B.Bucher, C.J.Chiara, Z.Dlouhy, I.Gheorghe, D.G.Ghita, P.Hoff, J.Jolie, U.Koster, W.Kurcewicz, H.Mach, N.Marginean, R.Marginean, Z.Meliani, B.Olaizola, V.Paziy, J.M.Regis, M.Rudigier, T.Sava, G.S.Simpson, M.Stanoiu, L.Stroe

Low-spin states in 80Ge populated in the β decay of the 80Ga 3- isomer

RADIOACTIVITY 80mGa(β-)[from decay of 80Zn produced in U(n, F), E=fast neutrons at the ISOLDE-CERN facility, followed by separation of fission fragments passed using the ISOLDE Resonance Ionization Laser Ion Source (RILIS) and high-resolution magnetic separator]; measured Eγ, Iγ, βγ- and γγ-coin using two HPGe detectors for γ rays and an NE111A organic plastic scintillator for β detection. 80Ge; deduced levels, J, π, β feedings, logft. Comparison with previous experimental results, and with shell-model and IBM calculations.

NUCLEAR STRUCTURE 70,72,74,76,78,80,82Ge, 82Se, 84Kr, 86Sr, 88Zr, 90Mo; calculated energies of second 0+ states by shell-model using Antoine code with JUN45 interaction, and NUSHELLX@MSU code with jj44bpn interaction, and IBM-1, IBM-2 models, and comparison with experimental values; Systematics of low-lying positive-parity levels up to 8+.

doi: 10.1103/PhysRevC.104.024317
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2021UR03      Phys.Rev. C 104, 064309 (2021)

W.Urban, K.Sieja, T.Rzkaca-Urban, J.Wisniewski, A.Blanc, M.Jentschel, P.Mutti, U.Koster, T.Soldner, G.de France, G.S.Simpson, C.A.Ur, A.G.Smith, J.P.Greene

Structure of even-even Sr isotopes with 50 ≤ N ≤ 58 neutrons

NUCLEAR REACTIONS 235U(n, F), E=thermal; measured Eγ, Iγ, γγ-coin, γγ(θ), γγ(linear polarization) using Exogam array at Institut Laue Langevin (EXILL) at Grenoble. 90,92,94Sr, 96Sr; deduced levels, J, π, γ-branching ratios, multipolarities, multipole mixing ratios. Comparison with previous experimental results, and with large-scale shell-model calculations; discussed role of the ν9/2[404] extruder in change of deformation in this mass range. Systematics of excited 0+ low-lying states in N=50-64, Zn, Ge, Se, Kr, Sr, Zr, Ru; and in N=50, 52, Z=28-50 even-even isotopes.

RADIOACTIVITY 252Cf(SF); measured Eγ, Iγ, γγ-coin using Gammasphere array at Argonne National Laboratory. 90,92,94Sr, 96Sr; deduced levels, J, π, γ-branching. Results from this experiment were mainly used as a countercheck of data from 235U(n, F) reaction. No separate Eγ, Iγ data given from this measurement.

NUCLEAR STRUCTURE 88,90,92,94Sr, 96Sr; calculated main proton and neutron components in wave functions of the levels in Sr isotopes, structure of first four 0+, first two 1+, first three 2+, first two 3+, and first 3-, 4-, 5-, 6-, 7- and 9- levels in terms of main components, B(M1), occupation of proton orbitals in selected levels of 88Sr using large-scale shell-model.

doi: 10.1103/PhysRevC.104.064309
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2020CI01      Phys.Lett. B 802, 135222 (2020)

N.Cieplicka-Orynczak, C.Michelagnoli, A.Gargano, B.Fornal, S.Leoni, G.Benzoni, A.Blanc, S.Bottoni, F.C.L.Crespi, L.W.Iskra, M.Jentschel, U.Koster, P.Mutti, N.Pietralla, E.Ruiz-Martinez, V.Werner

Contrasting properties of particle-particle and hole-hole excitations in 206Tl and 210Bi nuclei

NUCLEAR REACTIONS 209Bi, 205Tl(n, γ), E thermal; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, level schemes, branching ratios. Comparison with shell-model realistic calculations.

doi: 10.1016/j.physletb.2020.135222
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2020CR02      Eur.Phys.J. A 56, 94 (2020)

F.C.L.Crespi, N.Cieplicka-Orynczak, M.Jentschel, F.Kandzia, Y.H.Kim, U.Koster, S.Leoni, C.Michelagnoli, S.Ziliani

GRIDSA: femtosecond lifetime measurements with germanium detector arrays

NUCLEAR REACTIONS 35Cl(n, γ), E thermal; measured reaction products, Eγ, Iγ, γ-γ-coin. 36Cl; deduced γ-ray energies, level T1/2, two-step γ cascades. Comparison with ENSDF library. The Gamma Ray Induced Doppler Shift Attenuation (GRIDSA) method, the FIPPS HPGe-detectors, the in-pile position of the ILL reactor.

doi: 10.1140/epja/s10050-020-00088-x
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2020DU13      Phys.Rev. C 102, 044602 (2020)

S.Dubey, A.Echler, P.Egelhof, P.Grabitz, W.Lauterfeld, M.Mutterer, S.Stolte, A.Blanc, U.Koster, O.Serot, G.Kessedjian, S.Kraft-Bermuth, P.Scholz, F.Gonnenwein

Precise 92Rb and 96Y yields for thermal-neutron-induced fission of 235U and 239, 241Pu determined using calorimetric low-temperature detectors

NUCLEAR REACTIONS 235U, 239,241Pu(n, F), E=thermal neutrons from high-flux reactor at ILL-Grenoble; measured fission fragments using the LOHENGRIN mass spectrometer; deduced fractional independent yields per A=92 and A=96, independent yields per fission of A=92 and 96 isotopes of 92Rb, 92Sr, 92Kr, 96Rb, 96Sr, 96Y and 96Zr, and cumulative yields. Comparison with previous experimental results, and with data in evaluated libraries: JENDL-4.0, JEFF-3.3, and ENDF/B-VIII.0, and with GEF theoretical calculations. Relevance to reducing nuclear data uncertainties in the computation of reactor antineutrino spectra by the summation method. Discussed problem of 92Rb β- decay to 92Sr ground-state in the context of discrepancies between previous measurements for fission yields.

doi: 10.1103/PhysRevC.102.044602
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2020IS08      Phys.Rev. C 102, 054324 (2020)

L.W.Iskra, S.Leoni, B.Fornal, C.Michelagnoli, F.Kandzia, N.Marginean, M.Barani, S.Bottoni, N.Cieplicka-Orynczak, G.Colombi, C.Costache, F.C.L.Crespi, J.Dudouet, M.Jentschel, Y.H.Kim, U.Koster, R.Lica, R.Marginean, C.Mihai, R.E.Mihai, C.R.Nita, S.Pascu, C.Porzio, D.Reygadas, E.Ruiz-Martinez, A.Turturica

γ spectroscopy of the 96Y isotope: Searching for the onset of shape coexistence before N = 60

NUCLEAR REACTIONS 233,235U(n, F), E=thermal; measured fission events, Eγ, Iγ, double and triple γγ-coin tagged by fission events, γγ(θ), half-life of (6+) isomer by γγ(t) using FIPPS array of 16 HPGe clover detectors at ILL-Grenoble. 96Y; deduced levels, J, π, conversion coefficients, mixing ratios, multipolarities, configurations, shape coexistence. Comparison with predictions of Hartree-Fock-Bogoliubov calculations in literature. Possible relevance to calculations of electron and antineutrino spectra from fission of actinides. 137I; measured γγ-coin, relative yields of the cross-coincidence iodine fission partners.

doi: 10.1103/PhysRevC.102.054324
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2020JU03      Phys.Rev. C 102, 034602 (2020)

S.Julien-Laferriere, A.Chebboubi, G.Kessedjian, O.Serot, O.Litaize, A.Blanc, U.Koster, O.Meplan, M.Ramdhane, C.Sage

Investigation of neutron emission through the local odd-even effect as a function of the fission product kinetic energy

NUCLEAR REACTIONS 241Pu(n, F)139Te/139I/139Xe/139Cs/139Ba/139La, E=Thermal; measured A=139 fission products using the using the LOHENGRIN recoil separator for fission products at the high-flux reactor of ILL-Grenoble, off-line Eγ, Iγ using two Clover Ge detectors; deduced absolute isotopic fission yields of A=139 isobars, neutron multiplicity probability, odd-even effect as a function of kinetic energy of the fission products. Comparison with Hauser-Feshbach calculations using he Monte Carlo code FIFRELIN.

doi: 10.1103/PhysRevC.102.034602
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2020KA46      Eur.Phys.J. A 56, 207 (2020)

F.Kandzia, G.Belier, C.Michelagnoli, J.Aupiais, M.Barani, J.Dudouet, Ch.E.Dullmann, L.W.Iskra, M.Jentschel, Y.H.Kim, U.Koster, A.Turturica

Development of a liquid scintillator based active fission target for FIPPS

NUCLEAR REACTIONS 233,235U(n, F)134Te, E not given; measured reaction products, Eγ, Iγ; deduced γ-ray energies and intensities, J, π.

doi: 10.1140/epja/s10050-020-00201-0
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2020KN04      Phys.Rev. C 102, 054322 (2020)

L.Knafla, P.Alexa, U.Koster, G.Thiamova, J.-M.Regis, J.Jolie, A.Blanc, A.M.Bruce, A.Esmaylzadeh, L.M.Fraile, G.de France, G.Hafner, S.Ilieva, M.Jentschel, V.Karayonchev, W.Korten, T.Kroll, S.Lalkovski, S.Leoni, H.Mach, N.Marginean, P.Mutti, G.Pascovici, V.Paziy, Zs.Podolyak, P.H.Regan, O.J.Roberts, N.Saed-Samii, G.S.Simpson, J.F.Smith, T.Soldner, C.Townsley, C.A.Ur, W.Urban, A.Vancraeyenest, N.Warr

Lifetime measurements in the odd-A nucleus 177Hf

RADIOACTIVITY 177mLu(β-)[from thermal neutron activation of Lu(NO3)3 at the FRM2 reactor in Garching]; measured Eγ, Iγ, γγ-coin, half-lives of levels in 177Hf by γγ(t) and generalized-centroid-difference (GCD) method using EXILL-FATIMA array of eight HPGe-Clover detectors and 16 fast-timing LaBr3(Ce) detectors at ILL-Grenoble. 177Hf; deduced levels, J, π, B(M1), B(E2), B(E1), configurations. Comparison to particle-rotor-model (PRM), and quasiparticle-phonon-model (QPM) calculations with multipole-multipole interactions. 176Hf; calculated microscopic structure of the lowest 2-qp vibrational states.

doi: 10.1103/PhysRevC.102.054322
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2020KO03      Phys.Rev. C 101, 014303 (2020)

P.Koseoglou, V.Werner, N.Pietralla, S.Ilieva, T.Niksic, D.Vretenar, P.Alexa, M.Thurauf, C.Bernards, A.Blanc, A.M.Bruce, R.B.Cakirli, N.Cooper, L.M.Fraile, G.de France, M.Jentschel, J.Jolie, U.Koster, W.Korten, T.Kroll, S.Lalkovski, H.Mach, N.Marginean, P.Mutti, Z.Patel, V.Paziy, Zs.Podolyak, P.H.Regan, J.-M.Regis, O.J.Roberts, N.Saed-Samii, G.S.Simpson, T.Soldner, C.A.Ur, W.Urban, D.Wilmsen, E.Wilson

Low-Z boundary of the N=88-0 shape phase transition: 148Ce near the critical point

NUCLEAR REACTIONS 235U(n, Fγ), E=cold neutrons from PF1B, ILL-Grenoble facility; measured Eγ, γγ-coin, half-lives of the first 2+ and 4+ levels in 148Ce by fast-timing technique using the EXILL-FATIMA array of eight EXOGAM clovers and 16 LaBr3(Ce) scintillators. 148Ce; deduced levels, B(E2) for the first 2+ 4+ states. Comparison with predictions of vibrator, rigid rotor, X(5) and X(5)-β8 models, and with previous experimental results. Systematics of E(first 4+)/E(first 2+) and energies of the yrast states for N=90 isotones 146Ba, 148Ce, 150Nd, 152Sm, 154Gd, 156Dy.

NUCLEAR STRUCTURE 144,146,148Ce, 146,148,150Nd, 148,150,152,154Sm; calculated quantum shape phase transition (QSPT) lines in the IBM symmetry triangle using IBM-1 model. 148Ce; calculated self-consistent triaxial quadrupole constrained energy surfaces and probability distributions in in the β-γ plane using Axial Skyrme-Hartree-Fock-Bogoliubov model.

doi: 10.1103/PhysRevC.101.014303
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2020MA37      Phys.Rev.Lett. 125, 102502 (2020)

N.Marginean, D.Little, Y.Tsunoda, S.Leoni, R.V.F.Janssens, B.Fornal, T.Otsuka, C.Michelagnoli, L.Stan, F.C.L.Crespi, C.Costache, R.Lica, M.Sferrazza, A.Turturica, A.D.Ayangeakaa, K.Auranen, M.Barani, P.C.Bender, S.Bottoni, M.Boromiza, A.Bracco, S.Calinescu, C.M.Campbell, M.P.Carpenter, P.Chowdhury, M.Ciemala, N.Cieplicka-Orynczak, D.Cline, C.Clisu, H.L.Crawford, I.E.Dinescu, J.Dudouet, D.Filipescu, N.Florea, A.M.Forney, S.Fracassetti, A.Gade, I.Gheorghe, A.B.Hayes, I.Harca, J.Henderson, A.Ionescu, L.W.Iskra, M.Jentschel, F.Kandzia, Y.H.Kim, F.G.Kondev, G.Korschinek, U.Koster, Krishichayan, M.Krzysiek, T.Lauritsen, J.Li, R.Marginean, E.A.Maugeri, C.Mihai, R.E.Mihai, A.Mitu, P.Mutti, A.Negret, C.R.Nita, A.Olacel, A.Oprea, S.Pascu, C.Petrone, C.Porzio, D.Rhodes, D.Seweryniak, D.Schumann, C.Sotty, S.M.Stolze, R.Suvaila, S.Toma, S.Ujeniuc, W.B.Walters, C.Y.Wu, J.Wu, S.Zhu, S.Ziliani

Shape Coexistence at Zero Spin in 64Ni Driven by the Monopole Tensor Interaction

NUCLEAR REACTIONS 62Ni(18O, 16O), E=39 MeV; 65Cu(11B, 12C), E=26 MeV; 63Ni(n, γ), E thermal; measured reaction products, Eγ, Iγ; analyzed available data from multiple experiments. 64Ni; deduced γ-ray energies, J, π, B(E2). Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.125.102502
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2020PA26      Phys.Rev. C 102, 014329 (2020)

V.Paziy, L.M.Fraile, H.Mach, B.Olaizola, G.S.Simpson, A.Aprahamian, C.Bernards, J.A.Briz, B.Bucher, C.J.Chiara, Z.Dlouhy, I.Gheorghe, D.Ghita, P.Hoff, J.Jolie, U.Koster, W.Kurcewicz, R.Lica, N.Marginean, R.Marginean, J.-M.Regis, M.Rudigier, T.Sava, M.Stanoiu, L.Stroe, W.B.Walters

Fast-timing study of 81Ga from the β decay of 81Zn

RADIOACTIVITY 81Zn(β-), (β-n)[from U(p, F), E=1.4 GeV at CERN PS-Booster (PSB) facility, followed by separation of ionized nuclei using the ISOLDE-RILIS]; measured Eγ, Iγ, b-, βγ- and γγ-coin, half-life of 81Zn decay, level half-lives by βγγ(t) fast-timing technique, β-delayed neutron branching ratio or Pn using HPGe and LaBr3 detectors for γ detection and a plastic scintillator for β detection at CERN-ISOLDE. 80,81Ga(β-); measured half-lives of 80Ga and 81Ga decays. 80,81Ga; deduced levels, J, π, Iβ, logft, B(M1), and B(E2). Comparison with large-scale shell model calculations using the NuShellX@MSU and ANTOINE codes with JUN45 and jj44b interactions. Systematics of low-lying levels in 71,73,75,77,79,81Ga, 79Cu, 83As, 85Br, 87Rb. 81Zn; discussed spin, parity and configuration of the ground state.

doi: 10.1103/PhysRevC.102.014329
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2020PO12      Phys.Rev. C 102, 064310 (2020)

C.Porzio, C.Michelagnoli, N.Cieplicka-Orynczak, M.Sferrazza, S.Leoni, B.Fornal, Y.Tsunoda, T.Otsuka, S.Bottoni, C.Costache, F.C.L.Crespi, L.W.Iskra, M.Jentschel, F.Kandzia, Y.-H.Kim, U.Koster, N.Marginean, C.Mihai, P.Mutti, A.Turturica

Detailed low-spin spectroscopy of 65Ni via neutron capture reaction

NUCLEAR REACTIONS 64Ni(n, γ), E=thermal; measured Eγ, Iγ, γγ-coin, γγ(θ) using FIPPS array of eight HPGe clovers at ILL, Grenoble. 65Ni; deduced levels, J, π, multipolarities, mixing ratios; calculated potential-energy surfaces of 65Ni in (Q0, Q2) plane for different excited states. Comparison with Monte Carlo shell-model (MCSM) calculations, predicting spherical shapes for most states, with the exception of first 9/2+ and second 1/2- states of oblate deformation.

doi: 10.1103/PhysRevC.102.064310
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2020ST03      Eur.Phys.J. A 56, 69 (2020)

D.Studer, J.Ulrich, S.Braccini, T.S.Carzaniga, R.Dressler, K.Eberhardt, R.Heinke, U.Koster, S.Raeder, K.Wendt

High-resolution laser resonance ionization spectroscopy of 143-147Pm

doi: 10.1140/epja/s10050-020-00061-8
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2020VE01      Nucl.Instrum.Methods Phys.Res. B463, 327 (2020)

H.Verhoeven, T.E.Cocolios, K.Dockx, G.J.Farooq-Smith, O.Felden, R.Formento-Cavaier, R.Gebel, U.Koster, B.Neumaier, B.Scholten, I.Spahn, S.Spellerberg, M.E.Stamati, S.Stegemann

Measurement of spallation cross sections for the production of terbium radioisotopes for medical applications from tantalum targets

NUCLEAR REACTIONS Ta(p, X)149Tb, E=0.3-1.7 GeV; measured reaction products, Eβ, Iβ; deduced cumulative σ. Comparison with available data.

doi: 10.1016/j.nimb.2019.04.071
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2019BA22      Phys.Rev. C 99, 054317 (2019)

A.E.Barzakh, J.G.Cubiss, A.N.Andreyev, M.D.Seliverstov, B.Andel, S.Antalic, P.Ascher, D.Atanasov, D.Beck, J.Bieron, K.Blaum, Ch.Borgmann, M.Breitenfeldt, L.Capponi, T.E.Cocolios, T.Day Goodacre, X.Derkx, H.De Witte, J.Elseviers, D.V.Fedorov, V.N.Fedosseev, S.Fritzsche, L.P.Gaffney, S.George, L.Ghys, F.P.Hessberger, M.Huyse, N.Imai, Z.Kalaninova, D.Kisler, U.Koster, M.Kowalska, S.Kreim, J.F.W.Lane, V.Liberati, D.Lunney, K.M.Lynch, V.Manea, B.A.Marsh, S.Mitsuoka, P.L.Molkanov, Y.Nagame, D.Neidherr, K.Nishio, S.Ota, D.Pauwels, L.Popescu, D.Radulov, E.Rapisarda, J.P.Revill, M.Rosenbusch, R.E.Rossel, S.Rothe, K.Sandhu, L.Schweikhard, S.Sels, V.L.Truesdale, C.Van Beveren, P.Van den Bergh, P.Van Duppen, Y.Wakabayashi, K.D.A.Wendt, F.Wienholtz, B.W.Whitmore, G.L.Wilson, R.N.Wolf, K.Zuber

Inverse odd-even staggering in nuclear charge radii and possible octupole collectivity in 217, 218, 219At revealed by in-source laser spectroscopy

NUCLEAR MOMENTS 217,218,219At; measured hyperfine structure spectra, isotopic shifts, and hyperfine splitting constants using in-source resonance-ionization technique at CERN-ISOLDE; deduced magnetic dipole and electric quadrupole moments, changes in nuclear mean-square charge radii, octupole collectivity. 217,218,219At isotopes produced in U(p, X), E=1.4 GeV reaction. Systematics of g factors in 209,211,213Bi, 211,217,219At, 213,219,221,223,225Fr, 215,217,227Ac, changes in rms charge radii for 207,208,209,210,211,217,218,219At, shell-effect parameters in Pb, Bi, Po, At, Rn, Fr, Ra, Ac isotopes, and odd-even staggering in 205,207,209,211Pb, 207,209,217Po, 208,210,218At, 210,212,220,222,224,226Fr, 219,221Rn, 221,223,225,227Ra.

doi: 10.1103/PhysRevC.99.054317
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2019BO22      Acta Phys.Pol. B50, 285 (2019)

S.Bottoni, L.W.Iskra, S.Leoni, B.Fornal, G.Colo, D.Bazzacco, L.Gatti, G.Benzoni, A.Blanc, G.Bocchi, A.Bracco, N.Cieplicka-Orynczak, F.C.L.Crespi, M.Jentschel, U.Koster, C.Michelagnoli, B.Million, P.Mutti, T.Soldner, C.A.Ur, W.Urban

Investigating Core Excitations in the 131Sn One-valence-hole Nucleus

NUCLEAR REACTIONS 235U, 241Pu(n, F), E=cold; measured Eγ, Iγ, γγ-coin. 131Sn; deduced levels, J, π; calculated levels, J, π using Hybrid Configuration Mixing Model describing 131Sn in terms of 132Sn core coupled to single-hole degrees of freedom.

doi: 10.5506/aphyspolb.50.285
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2019CU02      Phys.Rev. C 99, 064317 (2019)

J.G.Cubiss, A.N.Andreyev, A.E.Barzakh, B.Andel, S.Antalic, T.E.Cocolios, T.Day Goodacre, D.V.Fedorov, V.N.Fedosseev, R.Ferrer, D.A.Fink, L.P.Gaffney, L.Ghys, M.Huyse, Z.Kalaninova, U.Koster, B.A.Marsh, P.L.Molkanov, R.E.Rossel, S.Rothe, M.D.Seliverstov, S.Sels, A.M.Sjodin, M.Stryjczyk, V.L.Truesdale, C.Van Beveren, P.Van Duppen, G.L.Wilson

Fine structure in the α decay of 218At

RADIOACTIVITY 218At(α)[from U(p, F), E=1.4 GeV, followed by selective ionization of 218At using RILIS at CERN-ISOLDE facility]; measured Eα, Iα, Eγ, Iγ, αγ-coin, half-life of 218At decay using silicon detectors for α detection and low-energy Ge detector for γ detection. 214Bi; deduced levels, J, π, α feedings, α hindrance factors. 218At; deduced J, π. Systematics of low-lying level energies in 210,212,214Bi, 212,214,216At, and α hindrance factors in the decays of 214,216,218At, 216Fr. Comparison with theoretical predictions, and with previous experimental results.

doi: 10.1103/PhysRevC.99.064317
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2019DE19      Nucl.Instrum.Methods Phys.Res. A936, 252 (2019)

M.De Gerone, B.Alpert, D.Becker, D.Bennett, M.Biasotti, V.Ceriale, R.Dressler, M.Faverzani, E.Ferri, J.Fowler, G.Gallucci, J.Gard, F.Gatti, A.Giachero, J.Hays-Wehle, S.Heinitz, G.Hilton, U.Koester, M.Lusignoli, J.Mates, A.Nucciotti, S.Nisi, A.Orlando, G.Pessina, A.Puiu, S.Ragazzi, C.Reintsema, M.Ribeiro Gomes, D.Schmidt, D.Schumann, D.Swetz, J.Ullom, L.Vale

Probing the absolute neutrino mass scale with 163Ho: The HOLMES project

RADIOACTIVITY 163Ho(EC); measured decay products; deduced sensitivity towards neutrino mass.

doi: 10.1016/j.nima.2018.10.108
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2019ES04      Phys.Rev. C 100, 064309 (2019)

A.Esmaylzadeh, J.-M.Regis, Y.H.Kim, U.Koster, J.Jolie, V.Karayonchev, L.Knafla, K.Nomura, L.M.Robledo, R.Rodriguez-Guzman

Lifetime measurements and shape coexistence in 97Sr

NUCLEAR REACTIONS 235U(n, F), E=thermal neutrons from high-flux reactor of ILL-Grenoble; measured fission products using Lohengrin spectrometer, Eγ, Iγ, level half-lives by (fragment)γγ(t) fast-timing technique using LaBr detectors for γ detection and ionization chamber for fission fragments. 97Sr; deduced levels, isomer, J, π, B(M1), B(E2). Comparison with previous experimental results, and with interacting boson-fermion model calculation based on microscopic energy density functional.

doi: 10.1103/PhysRevC.100.064309
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2019GH11      Phys.Rev. C 100, 054310 (2019)

L.Ghys, A.N.Andreyev, M.Huyse, P.Van Duppen, S.Antalic, A.Barzakh, L.Capponi, T.E.Cocolios, J.Cubiss, X.Derkx, H.De Witte, J.Elseviers, F.P.Hessberger, Z.Kalaninova, U.Koster, J.F.W.Lane, V.Liberati, S.Mitsuoka, Y.Nagame, K.Nishio, S.Ota, D.Pauwels, R.D.Page, L.Popescu, D.Radulov, M.M.Rajabali, E.Rapisarda, K.Sandhu, V.L.Truesdale, P.Van den Bergh, Y.Wakabayashi

α-decay properties of 200, 202Fr

RADIOACTIVITY 200,202,202mFr, 196,198,198mAt, 194,192Bi(α)[from 238U(p, F), E=1.4 GeV]; measured Eα, Iα, Eγ, Iγ, αγ- and αγγ-coin, half-lives of 200Fr g.s., 198At g.s. and 198At isomer using the windmill detection setup at ISOLDE-CERN; 196,198At, 192,194Bi; deduced levels, J, π, total conversion coefficients, multipolarities, α-reduced widths. 190Tl, 194Bi, 198At, 202Fr, 206Ac; deduced energies of the isomeric states and compared to previous experimental values. 198,202Po, 200,202At, 202Rn(α); measured Eα. Systematics of 206Ac to 190Tl and 200Fr to 188Tl decay chains. Systematics of α-reduced widths for odd-odd A=184-201 Fr, At and Bi α-emitters.

doi: 10.1103/PhysRevC.100.054310
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2019GR06      J.Phys.(London) G46, 075101 (2019)

E.T.Gregor, N.N.Arsenyev, M.Scheck, T.M.Shneidman, M.Thurauf, C.Bernards, A.Blanc, R.Chapman, F.Drouet, A.A.Dzhioev, G.de France, M.Jentschel, J.Jolie, J.M.Keatings, T.Kroll, U.Koster, R.Leguillon, K.R.Mashtakov, P.Mutti, D.O'Donnell, C.M.Petrache, G.S.Simpson, J.Sinclair, J.F.Smith, T.Soldner, P.Spagnoletti, A.V.Sushkov, W.Urban, A.Vancraeyenest, J.R.Vanhoy, V.Werner, K.O.Zell, M.Zielinska

Decay properties of the 3-1 level in 96Mo

NUCLEAR REACTIONS 95Mo(n, 2γ), E cold; measured reaction products, Eγ, Iγ, γ-γ-coin.; deduced γ-ray energies and intensities, B(Eλ). Comparison with QRPA results.

NUCLEAR STRUCTURE 92,94,96,98Mo; calculated energy levels, B(Eλ) using QRPA approach.

doi: 10.1088/1361-6471/ab0b5e
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2019GU28      Phys.Lett. B 797, 134809 (2019); Erratum Phys.Lett. B 802, 135268 (2020)

C.Guerrero, M.Tessler, M.Paul, J.Lerendegui-Marco, S.Heinitz, E.A.Maugeri, C.Domingo-Pardo, R.Dressler, S.Halfon, N.Kivel, U.Koster, T.Palchan-Hazan, J.M.Quesada, D.Schumann, L.Weissman

The s-process in the Nd-Pm-Sm region: Neutron activation of 147Pm

NUCLEAR REACTIONS 147Pm, 197Au(n, γ), E ∼ 40 keV; measured reaction products, Eγ, Iγ; deduced Maxwellian averaged σ. Comparison with available data.

doi: 10.1016/j.physletb.2019.134809
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2019HE03      Nat.Phys. 15, 208 (2019)

S.Heinitz, U.Koster

Zirconium isotope found to be a neutron poison

doi: 10.1038/s41567-019-0452-5
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2019HE12      Phys.Rev. C 99, 065810 (2019)

T.Heftrich, M.Weigand, Ch.E.Dullmann, K.Eberhardt, S.Fiebiger, J.Glorius, K.Gobel, C.Guerrero, R.Haas, S.Heinitz, J.Lerendegui-Marco, F.Kappeler, J.D.Kaiser, U.Koster, C.Langer, S.Lohse, F.Ludwig, R.Reifarth, D.Renisch, K.Scheutwinkel, D.Schumann, N.Wiehl, C.Wolf

Thermal (n, γ) cross section and resonance integral of 171Tm

NUCLEAR REACTIONS 171Tm(n, γ), E=thermal; measured Eγ, Iγ, thermal and epithermal neutron fluence, σ, and resonance integral using activation technique at Triga reactor facility in Mainz. Comparison with previous experimental values, and with data in evaluated libraries. Relevance to s process in thermally pulsing asymptotic giant branch (TP-AGB) stars.

doi: 10.1103/PhysRevC.99.065810
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2019MA71      Phys.Rev. C 100, 044610 (2019)

H.Makii, K.Nishio, K.Hirose, R.Orlandi, R.Leguillon, T.Ogawa, T.Soldner, U.Koster, A.Pollitt, F.-J.Hambsch, I.Tsekhanovich, M.Aiche, S.Czajkowski, L.Mathieu, C.M.Petrache, A.Astier, S.Guo, T.Ohtsuki, S.Sekimoto, K.Takamiya, R.J.W.Frost, T.Kawano

Effects of the nuclear structure of fission fragments on the high-energy prompt fission γ-ray spectrum in 235U(nth, f)

NUCLEAR REACTIONS 235U(n, F), E=cold neutrons; measured fission fragments, Eγ, Iγ, prompt fission γ-ray spectra (PFGS), (fragment)(fragment)- and (fragment)γ-coin, time of flight using two MWPCs and two LaBr3(Ce) scintillators at the PF1B cold-neutron beam facility of ILL-Grenoble; deduced fission-fragment mass distribution, average γ and neutron multiplicities as function of fragment mass. Comparison of the present and previous experimental data with statistical Hauser-Feshbach model calculations for PFGS.

doi: 10.1103/PhysRevC.100.044610
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2019OL02      Phys.Rev. C 99, 024321 (2019)

B.Olaizola, L.M.Fraile, H.Mach, F.Nowacki, A.Poves, A.Aprahamian, J.A.Briz, J.Cal-Gonzalez, D.Ghita, U.Koster, W.Kurcewicz, S.R.Lesher, D.Pauwels, E.Picado, D.Radulov, G.S.Simpson, J.M.Udias

Properties of low-lying states in 65Co from lifetime measurements

RADIOACTIVITY 65Fe(β-)[from U(p, F), E=1.4 GeV followed by ionization using a Resonance Ionization Laser Ion Source (RILIS) at ISOLDE-CERN facility]; measured Eγ, Iγ, βγ- and γγ-coin, half-life of 65Fe g.s. from decay curves for γ rays, level half-lives by βγ(t) and βγγ(t) using fast timing technique. 65Co; deduced levels, J, π, β feedings, logft, B(M1), and B(E2). Comparison with large-scale shell model calculations.

NUCLEAR STRUCTURE 65Co; calculated levels, J, π, occupation numbers using shell-model with LNPS effective interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.99.024321
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2019PE06      Phys.Rev. C 99, 024303 (2019)

C.M.Petrache, J.-M.Regis, C.Andreoiu, M.Spieker, C.Michelagnoli, P.E.Garrett, A.Astier, E.Dupont, F.Garcia, S.Guo, G.Hafner, J.Jolie, F.Kandzia, V.Karayonchev, Y.-H.Kim, L.Knafla, U.Koster, B.F.Lv, N.Marginean, C.Mihai, P.Mutti, K.Ortner, C.Porzio, S.Prill, N.Saed-Samii, W.Urban, J.R.Vanhoy, K.Whitmore, J.Wisniewski, S.W.Yates

Collectivity of the 2p-2h proton intruder band of 116Sn

NUCLEAR REACTIONS 115Sn(n, γ), E=thermal; measured Eγ, Iγ, γγ-coin, half-lives of levels using γγ-coin fast timing technique at ILL-Grenoble. 116Sn; deduced levels, J, π, B(E2) values of states in the normal and intruder configurations. Comparison with previous measurements, and with theoretical predictions using IBM-2. Systematics of levels, J, π and half-lives in 110,112,114,116,118,120,122Sn.

doi: 10.1103/PhysRevC.99.024303
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2019SI32      J.Phys.(London) G46, 065108 (2019)

G.Simpson, J.M.Regis, L.Bettermann, J.Genevey, J.Jolie, U.Koster, T.Materna, T.Malkiewicz, J.-F.Muraz, J.A.Pinston, B.Roussiere, G.Thiamova

Lifetime of the (15/2-1) state in 135Te

NUCLEAR REACTIONS 235U(n, F)135Te, E thermal; measured reaction products, Eγ, Iγ; deduced γ-ray energies, T1/2, B(E2). Comparison with NuShellX@MSU code results.

doi: 10.1088/1361-6471/ab1a75
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2019SP03      Phys.Rev. C 100, 014311 (2019)

P.Spagnoletti, G.Simpson, S.Kisyov, D.Bucurescu, J.-M.Regis, N.Saed-Samii, A.Blanc, M.Jentschel, U.Koster, P.Mutti, T.Soldner, G.de France, C.A.Ur, W.Urban, A.M.Bruce, C.Bernards, F.Drouet, L.M.Fraile, L.P.Gaffney, D.G.Ghita, S.Ilieva, J.Jolie, W.Korten, T.Kroll, S.Lalkovski, C.Larijarni, R.Lica, H.Mach, N.Marginean, V.Paziy, Zs.Podolyak, P.H.Regan, M.Scheck, J.F.Smith, G.Thiamova, C.Townsley, A.Vancraeyenest, V.Vedia, N.Warr, V.Werner, M.Zielinska

Lifetimes and shape-coexisting states of 99Zr

NUCLEAR REACTIONS 235U(n, F), E=cold neutrons from high-flux reactor of the Institut Laue-Langevin; measured Eγ, Iγ, level half-lives by γγ(t) using EXILL-FATIMA Ge and LaBr3(Ce) detector array for fast-timing technique. 99Zr; deduced levels, J, π, B(E2), B(M1), Q(transition), β2, configuration, kinematic moment of inertia for ν3/2[451] band. Systematics of kinematic moments of inertia of ν3/2[411] bands in 99,101,103Zr, 97Sr. Comparison with theoretical calculations using IBFM-1 model, and with previous experimental results.

doi: 10.1103/PhysRevC.100.014311
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2019TH01      Phys.Rev. C 99, 011304 (2019)

M.Thurauf, Ch.Stoyanov, M.Scheck, M.Jentschel, C.Bernards, A.Blanc, N.Cooper, G.De France, E.T.Gregor, C.Henrich, S.F.Hicks, J.Jolie, O.Kaleja, U.Koster, T.Kroll, R.Leguillon, P.Mutti, D.O'Donnell, C.M.Petrache, G.S.Simpson, J.F.Smith, T.Soldner, M.Tezgel, W.Urban, J.Vanhoy, M.Werner, V.Werner, K.O.Zell, T.Zerrouki

Low-lying octupole isovector excitation in 144Nd

NUCLEAR REACTIONS 143Nd(n, γ), E=cold; measured Eγ, Iγ, γγ-coin, γγ(θ), half-lives of 3- states by Doppler-shift technique (GRID) using EXILL array for γ detection at the Institut Laue-Langevin, Grenoble. 144Nd; deduced low-lying 3- levels, multipolarities, mixing ratios, B(M1), B(E2), B(E3). Comparison with quasiparticle phonon model (QPM) calculations.

doi: 10.1103/PhysRevC.99.011304
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2019TO02      Phys.Rev. C 99, 014612 (2019)

I.Tomandl, J.Vacik, U.Koster, L.Viererbl, E.A.Maugeri, S.Heinitz, D.Schumann, M.Ayranov, J.Ballof, R.Catherall, K.Chrysalidis, T.Day Goodacre, D.Fedorov, V.Fedosseev, K.Johnston, B.Marsh, S.Rothe, J.Schell, Ch.Seiffert

Measurement of the 7Be (n, p) cross section at thermal energy

NUCLEAR REACTIONS 7Be(n, p), E=thermal; measured Ep, Ip, and σ to the ground state and first excited state in 7Li using a surface barrier detector for charged particle detection at the LVR-15 research reactor of Rez. Comparison with previous experimental values. Relevance to systematic investigation of all neutron-induced destruction reactions of 7Be at various neutron energies up to primordial temperatures.

doi: 10.1103/PhysRevC.99.014612
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2019VE09      Eur.Phys.J. C 79, 1026 (2019)

C.Velte, F.Ahrens, A.Barth, K.Blaum, M.Brass, M.Door, H.Dorrer, Ch.E.Dullmann, S.Eliseev, C.Enss, P.Filianin, A.Fleischmann, L.Gastaldo, A.Goeggelmann, T.Day Goodacre, M.W.Haverkort, D.Hengstler, J.Jochum, K.Johnston, M.Keller, S.Kempf, T.Kieck, C.M.Konig, U.Koster, K.Kromer, F.Mantegazzini, B.Marsh, Yu.N.Novikov, F.Piquemal, C.Riccio, D.Richter, A.Rischka, S.Rothe, R.X.Schussler, Ch.Schweiger, T.Stora, M.Wegner, K.Wendt, M.Zampaolo, K.Zuber

High-resolution and low-background 163Ho spectrum: interpretation of the resonance tails

RADIOACTIVITY 163Ho(EC) [from 162Er(n, γ), E thermal]; measured decay products, Eβ, Iβ; deduced energy spectrum, Q-value. Comparison with available data.

doi: 10.1140/epjc/s10052-019-7513-x
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2019WR02      Eur.Phys.J. A 55, 200 (2019)

T.Wright, S.Bennett, S.Heinitz, U.Koster, R.Mills, T.Soldner, P.Steier, A.Wallner, T.Wieninger

Measurement of the 13C(n, γ) thermal cross section via neutron irradiation and AMS

NUCLEAR REACTIONS 13C(n, γ), E=reactor[neutron beam from high-flux ILL research reactor to produce 14C atoms]; measured 14C/13C ratio using VERA Accelerator Mass Spectrometer allowing to determine 13C(n, γ)/14C thermal σ accurately at sub-eV region; deduced good agreement with other recent measurements using Prompt Gamma-ray Activation Analysis.

doi: 10.1140/epja/i2019-12893-0
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2018AL14      Phys.Rev. C 97, 034327 (2018)

P.Alexa, M.Ramdhane, G.Thiamova, G.S.Simpson, H.R.Faust, J.Genevey, U.Koster, T.Materna, R.Orlandi, J.A.Pinston, A.Scherillo, Z.Hons

Quasiparticle phonon model description of low-energy states in 152Pr

RADIOACTIVITY 152Pr(IT)[from 241Am(n, F), E=thermal, followed by mass separation of A=152 fission fragments using Lohengrin separator at ILL-Grenoble]; measured Eγ, Iγ, ce, x rays, (A=152 ions)γ-coin, (A=152 ions)ce-coin, half-life of the isomer by (A=152 ions)γ(t), conversion coefficients. 152Pr; deduced levels, J, π, multipolarities, configurations. Comparison with quasiparticle phonon model (QPM), combined with the particle-rotor model to include octupole correlations and Coriolis mixing. 152Nd; calculated energies of the first two 3- levels in connection with β- decay of 152Pr g.s. to 152Nd.

doi: 10.1103/PhysRevC.97.034327
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2018CI02      Acta Phys.Pol. B49, 561 (2018)

N.Cieplicka-Orynczak, C.Michelagnoli, S.Leoni, B.Fornal, G.Benzoni, A.Blanc, S.Bottoni, F.C.L.Crespi, L.W.Iskra, M.Jentschel, U.Koster, P.Mutti, N.Pietralla, E.Ruiz-Martinez, V.Werner

The Low-spin Structure of 206Tl Studied by γ-ray Spectroscopy from Thermal Neutron Capture Reaction

NUCLEAR REACTIONS 205Tl(n, γ)206Tl, E=thermal; measured Eγ, Iγ(θ), γγ-coin using FIPPS prompt γ-ray spectrometer (ILL); deduced 206Tl levels, J, π, especially at lower energies and low spins, relative σ(θ); calculated levels, J, π using shell model describing proton-hole and neutron-hole couplings near doubly magic 208Pb.

doi: 10.5506/aphyspolb.49.561
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2018CU02      Phys.Rev. C 97, 054327 (2018)

J.G.Cubiss, A.E.Barzakh, M.D.Seliverstov, A.N.Andreyev, B.Andel, S.Antalic, P.Ascher, D.Atanasov, D.Beck, J.Bieron, K.Blaum, Ch.Borgmann, M.Breitenfeldt, L.Capponi, T.E.Cocolios, T.Day Goodacre, X.Derkx, H.De Witte, J.Elseviers, D.V.Fedorov, V.N.Fedosseev, S.Fritzsche, L.P.Gaffney, S.George, L.Ghys, F.P.Hessberger, M.Huyse, N.Imai, Z.Kalaninova, D.Kisler, U.Koster, M.Kowalska, S.Kreim, J.F.W.Lane, V.Liberati, D.Lunney, K.M.Lynch, V.Manea, B.A.Marsh, S.Mitsuoka, P.L.Molkanov, Y.Nagame, D.Neidherr, K.Nishio, S.Ota, D.Pauwels, L.Popescu, D.Radulov, E.Rapisarda, J.P.Revill, M.Rosenbusch, R.E.Rossel, S.Rothe, K.Sandhu, L.Schweikhard, S.Sels, V.L.Truesdale, C.Van Beveren, P.Van den Bergh, Y.Wakabayashi, P.Van Duppen, K.D.A.Wendt, F.Wienholtz, B.W.Whitmore, G.L.Wilson, R.N.Wolf, K.Zuber

Charge radii and electromagnetic moments of 195-211At

NUCLEAR MOMENTS 195,195m,196,197,197m,198,198m,199,199m,200,200m,201,202,202m,203,204,205,206,207,208,209,210,211At; measured hfs spectra, hyperfine coupling constants, isotope shifts, and rms charge radii using the in-source resonance-ionization spectroscopy method, and Multi-Reflection Time-of-Flight Mass Spectrometer (MR-TOF MS) at CERN-ISOLDE; deduced magnetic dipole moments and spectroscopic quadrupole moments, configurations, and quadrupole deformation parameters. 206At; deduced J. Detailed systematics of magnetic dipole moments, spectroscopic quadrupole moments, deformations, and rms charge radii in Hg, Tl, Pb, Bi, Po, At, Fr, Ra and Ac nuclei. Comparison with theoretical calculations using multiconfiguration Dirac-Hartree-Fock (MCDHF) method.

NUCLEAR REACTIONS U(p, X)195At/195mAt/196At/197At/197mAt/198At/198mAt/199At/199mAt/200At/200m1At/200m2At/201At/202At/202mAt/203At/204At/205At/206At/207At/208At/209At/210At/211At, E=1.4 GeV; produced radioactive astatine isotopes by spallation reaction with beam from CERN PS Booster impinging on a thick UCx target, followed by injection into a hot cavity of the Resonance Ionization Laser Ion Source (RILIS), and ionization by a three-step photoionization scheme.

doi: 10.1103/PhysRevC.97.054327
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2018CU04      Phys.Lett. B 786, 355 (2018)

J.G.Cubiss, A.E.Barzakh, A.N.Andreyev, M.Al Monthery, N.Althubiti, B.Andel, S.Antalic, D.Atanasov, K.Blaum, T.E.Cocolios, T.Day Goodacre, R.P.de Groote, A.de Roubin, G.J.Farooq-Smith, D.V.Fedorov, V.N.Fedosseev, R.Ferrer, D.A.Fink, L.P.Gaffney, L.Ghys, A.Gredley, R.D.Harding, F.Herfurth, M.Huyse, N.Imai, D.T.Joss, U.Koster, S.Kreim, V.Liberati, D.Lunney, K.M.Lynch, V.Manea, B.A.Marsh, Y.Martinez Palenzuela, P.L.Molkanov, P.Mosat, D.Neidherr, G.G.O'Neill, R.D.Page, T.J.Procter, E.Rapisarda, M.Rosenbusch, S.Rothe, K.Sandhu, L.Schweikhard, M.D.Seliverstov, S.Sels, P.Spagnoletti, V.L.Truesdale, C.Van Beveren, P.Van Duppen, M.Veinhard, M.Venhart, M.Veselsky, F.Wearing, A.Welker, F.Wienholtz, R.N.Wolf, S.G.Zemlyanoy, K.Zuber

Change in structure between the I=1/2 states in 181Tl and 177, 179Au

RADIOACTIVITY 181Tl(α) [from U(p, X), E=1.4 GeV]; measured decay products, Eα, Iα; deduced α-decay branching ratio and T1/2. Comparison with available data.

NUCLEAR MOMENTS 177,179Au; measured frequencies; deduced hyperfine spectra, magnetic dipole moments, J assignments of the ground states.

doi: 10.1016/j.physletb.2018.10.005
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2018LO18      Phys.Rev. C 98, 024323 (2018)

R.Lozeva, E.A.Stefanova, H.Naidja, F.Nowacki, T.Rzaca-Urban, J.Wisniewski, W.Urban, I.Ahmad, A.Blanc, G.De France, F.Didierjean, G.Duchene, H.Faust, J.P.Greene, U.Koster, P.Mutti, G.Simpson, A.G.Smith, T.Soldner, C.A.Ur

New yrast and non-yrast states in 136I and medium-spin structure of 136I and 136Xe : Roles of the proton d5/2 and the neutron h9/2 orbitals beyond 132Sn

NUCLEAR REACTIONS 235U, 241Pu(n, F)136I, E=thermal; measured Eγ, Iγ, γγ-coin, γγ(θ), γγ(linear pol) using the EXILL-FATIMA system, EXOGAM and EUROGAM clover HPGe detectors at ILL, Grenoble. 136I; deduced yrast and non-yrast levels, J, π, conversion coefficients, multipolarities, mixing ratios, configurations. Comparison with large scale shell-model calculations.

RADIOACTIVITY 248Cm, 252Cf(SF); 136Te, 136I(β-)[136Te from 235U(n, F), E=thermal followed by separation of 136Te using Lohengrin fission-fragment separator at Grenoble, and 136I from 136Te decay]; measured Eγ, Iγ, γγ-coin, γγ(θ), γγ(lin pol). 136I, 136Xe; deduced levels, J, π, conversion coefficients, multipolarities, mixing ratios, configurations, Gamow-Teller strengths. Comparison with large scale shell-model calculations.

doi: 10.1103/PhysRevC.98.024323
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2018MA21      Nucl.Instrum.Methods Phys.Res. A889, 138 (2018)

E.A.Maugeri, S.Heinitz, R.Dressler, M.Barbagallo, J.Ulrich, D.Schumann, N.Colonna, U.Koster, M.Ayranov, P.Vontobel, M.Mastromarco, J.Schell, J.Martins Correia, T.Stora, for the n_TOF Collaboration

Preparation and characterization of three 7Be targets for the measurement of the 7Be(n, p)7Li and 7Be(n, α)7Li reaction cross sections

doi: 10.1016/j.nima.2018.01.078
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2018RZ01      Phys.Rev. C 98, 064315 (2018)

T.Rzaca-Urban, W.Urban, M.Czerwinski, J.Wisniewski, A.Blanc, H.Faust, M.Jentschel, P.Mutti, U.Koster, T.Soldner, G.de France, G.S.Simpson, C.A.Ur

Low-spin excitations in 97Zr

NUCLEAR REACTIONS 96Zr(n, γ), E=cold or thermal; measured Eγ, Iγ, γγ-coin, γγ(θ) using the EXILL HPGe array at the PF1B cold-neutron facility of ILL, Grenoble. 97Zr; deduced levels, J, π, multipolarities, mixing ratios, S(n), configurations. Comparison with previous experimental values. 27Al, 35Cl, 91Zr(n, γ), E=cold or thermal; measured Eγ, Iγ, data used for calibration purpose. 28Al, 92,97Zr; deduced S(n) and compared with literature values.

RADIOACTIVITY 97,97mY(β-)[from 235U(n, F) using Lohengrin fission-fragment separator of the ILL]; measured Eγ, Iγ, γγ-coin, γγ(θ), γγ(linear polarization) using the EXILL Ge array. 97Zr; deduced levels, J, π, multipolarities, mixing ratios. 97Sr, 88Br(IT); measured isomer half-lives of 830-keV isomer in 97Sr, and 270-keV isomer in 88Br by γ(t).

doi: 10.1103/PhysRevC.98.064315
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2018ST18      Phys.Rev. C 98, 064326 (2018)

M.Stryjczyk, Y.Tsunoda, I.G.Darby, H.De Witte, J.Diriken, D.V.Fedorov, V.N.Fedosseev, L.M.Fraile, M.Huyse, U.Koster, B.A.Marsh, T.Otsuka, D.Pauwels, L.Popescu, D.Radulov, M.D.Seliverstov, A.M.Sjodin, P.Van den Bergh, P.Van Duppen, M.Venhart, W.B.Walters, K.Wimmer

β-decay study of the 66Mn - 66Fe - 66Co - 66Ni decay chain

RADIOACTIVITY 66Mn(β-), (β-n)[from U(p, F), Mn beam purified by laser resonance ionization and mass separation]; 66Fe(β-)[from 66Mn β- decay]; 66Co(β-)[from 66Fe β- decay]; measured Eβ, Iβ, Eγ, Iγ, half-lives of β-decaying 66Mn, 66Fe, 66Co, γγ- and βγγ-coin, half-lives of isomers in 65Fe, 66Co by γ(t) using plastic scintillators for β detection and MiniBall cluster Ge detectors for γ detection at ISOLDE-CERN. 65,66Fe, 66Co, 66Ni; deduced levels, isomers, J, π, β feedings, logft, B(GT) values, %β-n value for the decay of 66Mn. Comparison with Monte Carlo shell model calculations.

NUCLEAR STRUCTURE 66Mn, 66Fe, 66Co, 66Ni; calculated average proton and neutron occupation numbers for selected low-lying positive-parity states, potential energy surface (PES) in (Q0, Q2) plane, levels, J, π, B(M1), B(E2) using Monte Carlo Shell model with the A3DA interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.98.064326
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2018WI06      Acta Phys.Pol. B49, 547 (2018)

J.Wisniewski, W.Urban, T.Rzaca-Urban, U.Koster, C.Michelagnoli, M.Jentschel, P.Mutti

Evolution of γ Collectivity - (n, γ) Spectroscopy of 98Mo with FIPPS*

NUCLEAR REACTIONS 97Mo(n, γ), E=thermal; measured Eγ, Iγ, γγ-coin using Ge Clover detectors of new instrument FIPPS; deduced γ-ray energy spectrum gated on 787.4 and 5680.0 keV lines, new γ-ray lines; deduced 97Mo gs (5/2)+ allowing measurements γ-band properties, partial γ transitions of 98Mo, levels, J, π angular correlations of cascading γ-rays, mixing ratios, evolution of collectivity in Mo isotopes in its early stage.

doi: 10.5506/aphyspolb.49.547
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2017AN15      Phys.Rev. C 96, 054323 (2017)

S.Ansari, J.-M.Regis, J.Jolie, N.Saed-Samii, N.Warr, W.Korten, M.Zielinska, M.-D.Salsac, A.Blanc, M.Jentschel, U.Koster, P.Mutti, T.Soldner, G.S.Simpson, F.Drouet, A.Vancraeyenest, G.de France, E.Clement, O.Stezowski, C.A.Ur, W.Urban, P.H.Regan, Zs.Podolyak, C.Larijani, C.Townsley, R.Carroll, E.Wilson, H.Mach, L.M.Fraile, V.Paziy, B.Olaizola, V.Vedia, A.M.Bruce, O.J.Roberts, J.F.Smith, M.Scheck, T.Kroll, A.-L.Hartig, A.Ignatov, S.Ilieva, S.Lalkovski, N.Marginean, T.Otsuka, N.Shimizu, T.Togashi, Y.Tsunoda

Experimental study of the lifetime and phase transition in neutron-rich 98, 100, 102Zr

NUCLEAR REACTIONS 235U(n, F), 241Pu(n, F), E=cold neutrons beam from PF1B, Institut Laue-Langevin (ILL), Grenoble; measured Eγ, γγ-coin, half-lives of the first 2+, 4+ and 6+ levels by fast-timing technique using the EXILL-FATIMA array consisting of eight EXOGAM clovers and 16 LaBr3(Ce) scintillators; fast-timing coincidence events analyzed using method of mirror symmetric centroid difference (MSCD) and generalized centroid difference method (GCDM). 98,100,102Zr; deduced levels, B(E2). Comparison with Interacting Boson model and Monte-Carlo shell-model calculations, and with previous experimental results. Systematics of B(E2) values for the first 2+, 4+ and 6+ states in 96,98,100,102,104,106Zr.

doi: 10.1103/PhysRevC.96.054323
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2017AN16      Phys.Rev. C 96, 054327 (2017)

B.Andel, A.N.Andreyev, S.Antalic, A.Barzakh, N.Bree, T.E.Cocolios, V.F.Comas, J.Diriken, J.Elseviers, D.V.Fedorov, V.N.Fedosseev, S.Franchoo, L.Ghys, J.A.Heredia, M.Huyse, O.Ivanov, U.Koster, V.Liberati, B.A.Marsh, K.Nishio, R.D.Page, N.Patronis, M.D.Seliverstov, I.Tsekhanovich, P.Van den Bergh, J.Van De Walle, P.Van Duppen, M.Venhart, S.Vermote, M.Veselsky, C.Wagemans

Detailed α-decay study of 180Tl

RADIOACTIVITY 180Tl(α)[from U(p, X), E=1.4 GeV using Resonance Ionization Laser Ion Source (RILIS) and HRS separator at ISOLDE-CERN facility]; measured Eα, Iα, Eγ, Iγ, E(x ray), I(x ray), αγ- and αγγ-coin. 176Au; deduced levels, α-decay branching ratios, reduced α-widths, total and K-conversion coefficients, multipolarities, configurations, population of only the low-spin activity in 176Au from 180Tl α decay. Comparison with previous experimental data. Systematics of α-reduced widths in α-decays of 178,180,182,184Tl. 180Hg(α)[from 180Tl ϵ decay]; 176Au(α)[from 180Tl α decay]; 176Pt(α)[from 180Hg α decay]; measured Eα, Eγ, αγ-coin. 172Ir; deduced level, low-spin activity in 172Ir populated by 176Au α decay.

doi: 10.1103/PhysRevC.96.054327
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2017BA04      Phys.Rev. C 95, 014324 (2017)

A.E.Barzakh, A.N.Andreyev, T.E.Cocolios, R.P.de Groote, D.V.Fedorov, V.N.Fedosseev, R.Ferrer, D.A.Fink, L.Ghys, M.Huyse, U.Koster, J.Lane, V.Liberati, K.M.Lynch, B.A.Marsh, P.L.Molkanov, T.J.Procter, E.Rapisarda, S.Rothe, K.Sandhu, M.D.Seliverstov, A.M.Sjodin, C.Van Beveren, P.Van Duppen, M.Venhart, M.Veselsky

Changes in mean-squared charge radii and magnetic moments of 179-184Tl measured by in-source laser spectroscopy

NUCLEAR MOMENTS 179,180,181,182m,183,183m,184mTl; measured hyperfine splittings, spins for 179,181,183Tl, magnetic moments, isotope shifts, and changes in mean square charge radii. 182mTl and 184mTl include two, and three isomers, respectively. In-source resonance ionization laser spectroscopy at CERN-ISOLDE facility; discussed configurations. Radioactive Tl isotopes from U(p, X), E=1.4 GeV reaction using UCx target, and General Purpose Separator of ISOLDE.

doi: 10.1103/PhysRevC.95.014324
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2017BO09      Acta Phys.Pol. B48, 595 (2017)

G.Bocchi, S.Leoni, B.Fornal, G.Colo, P.F.Bortignon, D.Bazzacco, A.Blanc, S.Bottoni, N.Cieplicka-Orynczak, F.C.L.Crespi, G.De France, M.Jentschel, U.Koster, C.Michelagnoli, P.Mutti, J.-M.Regis, G.Simpson, T.Soldner, B.Szpak, C.A.Ur, W.Urban

Interplay Between Particle and Core Excitations in 133Sb

NUCLEAR REACTIONS 235U, 241Pu(n, f), E=cold; measured fission fragments both prompt and delayed Eγ, Iγ(t), (fragment)γ-coin, γγ-coin. 133Sb; deduced high-spin γ transitions 13/2+ and 15/2+ isomers T1/2, levels, J, π above 16.6 ms (21/2)+, state (4526 keV), B(M1) for (15/2)+ to (13/2)+ to (11/2)+, depopulation of the (21/2)+ isomer; calculated levels configuration, B(M1) for (15/2)+ to (13/2)+ to (11/2)+ using new "hybrid" microscopic model including couplings to different types of core excitation. Compared with "pure" shell model calculation.

doi: 10.5506/APhysPolB.48.595
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2017CH51      Phys.Lett. B 775, 190 (2017)

A.Chebboubi, G.Kessedjian, O.Litaize, O.Serot, H.Faust, D.Bernard, A.Blanc, U.Koster, O.Meplan, P.Mutti, C.Sage

Kinetic energy dependence of fission fragment isomeric ratios for spherical nuclei 132Sn

NUCLEAR REACTIONS 235U(n, F)132Sn/132Te, E thermal; measured fission products, Eγ, Iγ; deduced γ-ray energies, isomeric ratios. Comparison with FIFRELIN code calculations.

doi: 10.1016/j.physletb.2017.10.067
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2017CI02      Acta Phys.Pol. B48, 577 (2017)

N.Cieplicka-Orynczak, G.Bocchi, S.Leoni, B.Fornal, S.Bottoni, M.Jentschel, U.Koster, P.Mutti, T.Soldner, A.Blanc, G.De France, G.S.Simpson, A.Turler, W.Urban, C.A.Ur

Study of 41Ca via Cold Neutron Capture

NUCLEAR REACTIONS 40,44,46Ca(n, γ), E=cold[Ca target with strongly enriched 44Ca]; measured Eγ, Iγ, γγ-coin using high resolution γ spectroscopy employing EXILL array (46 HPGe crystals). 41Ca; deduced γ transitions, levels, J, π, two new excited states, information about coupling valence nucleon with excitation of doubly-magic core.

doi: 10.5506/APhysPolB.48.577
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2017GA14      Eur.Phys.J. Special Topics 226, 1623 (2017)

L.Gastaldo, K.Blaum, K.Chrysalidis, T.Day Goodacre, A.Domula, M.Door, H.Dorrer, Ch.E.Dullmann, K.Eberhardt, S.Eliseev, C.Enss, A.Faessler, P.Filianin, A.Fleischmann, D.Fonnesu, L.Gamer, R.Haas, C.Hassel, D.Hengstler, J.Jochum, K.Johnston, U.Kebschull, S.Kempf, T.Kieck, U.Koster, S.Lahiri, M.Maiti, F.Mantegazzini, B.Marsh, P.Neroutsos, Yu.N.Novikov, P.C.O.Ranitzsch, S.Rothe, A.Rischka, A.Saenz, O.Sander, F.Schneider, S.Scholl, R.X.Schussler, Ch.Schweiger, F.Simkovic, T.Stora, Z.Szucs, A.Turler, M.Veinhard, M.Weber, M.Wegner, K.Wendt and K.Zuber

The electron capture in 163Ho experiment - ECHo

RADIOACTIVITY 163Ho(EC); measured decay products, X-rays; calculated electron capture spectrum; deduced sensitivity towards neutrino mass measurements.

doi: 10.1140/epjst/e2017-70071-y
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2017GR07      Phys.Rev. C 95, 051302 (2017)

I.N.Gratchev, G.S.Simpson, G.Thiamova, M.Ramdhane, K.Sieja, A.Blanc, M.Jentschel, U.Koster, P.Mutti, T.Soldner, G.de France, C.A.Ur, W.Urban

Identification of excited states and collectivity in 88Se

NUCLEAR REACTIONS 235U(n, F), E=cold neutron beam from PF1B-ILL-Grenoble; measured Eγ, Iγ, γγ-coin using EXILL array, average mass of complementary Ce nuclei. 88Se; deduced levels, J, π. Comparison with shell-model calculations, and systematics of first and second 2+ and first 4+ states in N=50-56 even-even Ge, Se, Kr and Sr isotopes. 145,146,147Ce, 86,87Se;observed γ rays.

doi: 10.1103/PhysRevC.95.051302
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2017GU18      Phys.Rev. C 96, 014608 (2017)

Y.K.Gupta, D.C.Biswas, O.Serot, D.Bernard, O.Litaize, S.Julien-Laferriere, A.Chebboubi, G.Kessedjian, C.Sage, A.Blanc, H.Faust, U.Koster, A.Ebran, L.Mathieu, A.Letourneau, T.Materna, S.Panebianco

Fission fragment yield distribution in the heavy-mass region from the 239Pu (nth, f) reaction

NUCLEAR REACTIONS 239Pu(n, F), E=thermal; measured fission fragments in A=126 to 150 range using the Lohengrin recoil-mass spectrometer at ILL-Grenoble high-flux reactor facility; deduced distributions of kinetic energies and ionic charge, relative mass yields in three independent experiments. Comparison with JEFF-3.1.1 fission yield evaluation, and with predictions of Monte Carlo nuclear fission models using GEF and FIFRELIN codes.

doi: 10.1103/PhysRevC.96.014608
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2017HO02      Phys.Rev. C 95, 014602 (2017)

P.Holmvall, U.Koster, A.Heinz, T.Nilsson

Collinear cluster tri-partition: Kinematics constraints and stability of collinearity

RADIOACTIVITY 252Cf(SF); calculated energies for ternary fission fragments Sn+Si+Ni and Sn+Ca+Ni for different mass splits, excitation energies, neutron multiplicities and scission configurations, angular distribution of ternary fission fragments; analyzed possibility of collinear cluster tripartition (CCT) originating from two sequential fission processes or one ternary decay. Comparison with experimental data. Relevance to experiments by FOBOS group at FLNR-JINR, and future experiments.

NUCLEAR REACTIONS 235U(n, F), E=thermal; calculated energies for ternary fission fragments Sn+Si+Ni and Sn+Ca+Ni for different mass splits. See keywords above for 252Cf(SF) decay for the other calculations and analyses.

doi: 10.1103/PhysRevC.95.014602
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2017IS03      Europhys.Lett. 117, 12001 (2017)

L.W.Iskra, B.Fornal, S.Leoni, G.Bocchi, A.Petrovici, C.Porzio, A.Blanc, G.De France, M.Jentschel, U.Koster, P.Mutti, J.-M.Regis, G.Simpson, T.Soldner, C.A.Ur, W.Urban, D.Bazzacco, G.Benzoni, S.Bottoni, A.Bruce, N.Cieplicka-Orynczak, F.C.L.Crespi, L.M.Fraile, W.Korten, T.Kroll, S.Lalkovski, N.Marginean, C.Michelagnoli, B.Melon, D.Mengoni, B.Million, A.Nannini, D.Napoli, Zs.Podolyak, P.H.Regan, B.Szpak

New isomer in 96Y marking the onset of deformation at N = 57

NUCLEAR REACTIONS 235U, 241Pu(n, X)96Y, E thermal; measured reaction products, Eγ, Iγ; deduced γ-ray energies, intensities, J, π, isomer T1/2, negative parity states B(E2). Comparison with theoretical calculations.

doi: 10.1209/0295-5075/117/12001
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2017IS04      Acta Phys.Pol. B48, 581 (2017)

L.W.Iskra, G.Bocchi, B.Fornal, S.Leoni, S.Bottoni, N.Cieplicka-Orynczak, M.Jentschel, U.Koster, C.Michelagnoli, P.Mutti, T.Soldner, A.Blanc, G.De France, G.S.Simpson, C.A.Ur, W.Urban

Yrast Structure Above the 9.6 s 8+ Isomer in 96Y Isotope

NUCLEAR REACTIONS 235U, 241Pu(n, x), E=cold; measured fission fragments Eγ, Iγ(θ), γγ-coin with gates on complementary fission fragment using highly efficient HPGe array consisting of eight EXOGAM Clover detectors, 6 large GASP detectors and 2 ILL Clovers. 96Y; deduced levels, J, π, partial level scheme, γ transitions, angular correlation coefficients, level structure above the 8+ isomer.

doi: 10.5506/APhysPolB.48.581
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2017IS12      Phys.Scr. 92, 104001 (2017)

L.W.Iskra, B.Fornal, S.Leoni, G.Bocchi, A.Blanc, S.Bottoni, N.Cieplicka-Orynczak, M.Jentschel, U.Koster, C.Michelagnoli, P.Mutti, T.Soldner, G.de France, G.S.Simpson, C.A.Ur, W.Urban

Medium and high spin structure in the 94Y isotope produced in fission induced by cold neutrons

NUCLEAR REACTIONS 235U(n, F)94Y, E thermal; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, high spin isomers.

doi: 10.1088/1402-4896/aa842a
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2017LI06      J.Phys.(London) G44, 054002 (2017)

R.Lica, G.Benzoni, A.I.Morales, M.J.G.Borge, L.M.Fraile, H.Mach, M.Madurga, C.Sotty, V.Vedia, H.De Witte, J.Benito, T.Berry, N.Blasi, A.Bracco, F.Camera, S.Ceruti, V.Charviakova, N.Cieplicka-Orynczak, C.Costache, F.C.L.Crespi, J.Creswell, G.Fernandez-Martinez, H.Fynbo, P.Greenlees, I.Homm, M.Huyse, J.Jolie, V.Karayonchev, U.Koster, J.Konki, T.Kroll, J.Kurcewicz, T.Kurtukian-Nieto, I.Lazarus, S.Leoni, M.Lund, N.Marginean, R.Marginean, C.Mihai, R.Mihai, A.Negret, A.Orduz, Z.Patyk, S.Pascu, V.Pucknell, P.Rahkila, J.M.Regis, F.Rotaru, N.Saed-Samii, V.Sanchez-Tembleque, M.Stanoiu, O.Tengblad, M.Thuerauf, A.Turturica, P.Van Duppen, N.Warr

β decay studies of n-rich Cs isotopes with the ISOLDE Decay Station

RADIOACTIVITY 148,149,150Cs(β-), (β-n)[from U(p, X), E=1.4 GeV at ISOLDE-CERN]; measured reaction products, Eγ, Iγ, βγ-, γγ-coin, half-lives of ground states of 148,149,150Cs, %Pn for the decay of 149Cs, half-lives of levels in 149Ba and 148Ce by βγγ(t). 149Ba; deduced levels, β feedings, multipolarities, half-lives. 148Ce; deduced half-life of the first 2+ state. Comparison with previous experimental half-lives, and with theoretical calculations.

doi: 10.1088/1361-6471/aa6015
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2017OH01      J.Phys.(London) G44, 044010 (2017)

T.Ohtsubo, S.Roccia, N.J.Stone, J.R.Stone, C.Gaulard, U.Koster, J.Nikolov, G.S.Simpson, M.Veskovic

The on-line low temperature nuclear orientation facility NICOLE

doi: 10.1088/1361-6471/aa5f22
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2017OL03      Phys.Rev. C 95, 061303 (2017)

B.Olaizola, L.M.Fraile, H.Mach, A.Poves, F.Nowacki, A.Aprahamian, J.A.Briz, J.Cal-Gonzalez, D.Ghita, U.Koster, W.Kurcewicz, S.R.Lesher, D.Pauwels, E.Picado, D.Radulov, G.S.Simpson, J.M.Udias

Search for shape-coexisting 0+ states in 66Ni from lifetime measurements

RADIOACTIVITY 66Co(β-)[from 66Mn -> 66Fe decay, 66Mn from U(p, F), E=1.4 GeV at ISOLDE-CERN facility using RILIS]; measured Eγ, half-life of an excited 0+ state by βγγ(t) method using LaBr3(Ce) crystals and two HPGe detectors for γ rays, and a fast plastic scintillator for beta particles. 66Ni; deduced levels, B(E2). Comparison with large-scale shell model calculations, and with previous experimental data.

doi: 10.1103/PhysRevC.95.061303
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2017OL08      J.Phys.(London) G44, 125103 (2017)

B.Olaizola, L.M.Fraile, H.Mach, A.Poves, A.Aprahamian, J.A.Briz, J.Cal-Gonzalez, D.Ghita, U.Koster, W.Kurcewicz, S.R.Lesher, D.Pauwels, E.Picado, D.Radulov, G.S.Simpson, J.M.Udias

Beta decay of 66Mn to the N = 40 nucleus 66Fe

RADIOACTIVITY 66Mn(β-), (β-n) [from U(p, X), E=1.4 GeV]; measured decay products, Eγ, Iγ; deduced 66Fe T1/2, γ-ray energies and intensities, B(E2), B(M1) limits. Comparison with shell model calculations.

doi: 10.1088/1361-6471/aa915e
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2017RA11      J.Phys.(London) G44, 074001 (2017)

E.Rapisarda, A.N.Andreyev, S.Antalic, A.Barzakh, T.E.Cocolios, I.G.Darby, R.De Groote, H.De Witte, J.Diriken, J.Elseviers, D.Fedorov, V.N.Fedosseev, R.Ferrer, M.Huyse, Z.Kalaninova, U.Koster, J.Lane, V.Liberati, K.M.Lynch, B.A.Marsh, P.L.Molkanov, D.Pauwels, T.J.Procter, D.Radulov, K.Sandhu, M.D.Seliverstov, C.Van Beveren, P.Van den Bergh, P.Van Duppen, M.Venhart, M.Veselsky, K.Wrzosek-Lipska

Shape coexistence studied in 182, 184Hg via the β decay of 182, 184Tl

RADIOACTIVITY 182,184Tl(β+), (EC) [from U(p, X), E=1.4 GeV]; measured decay products, Eγ, Iγ, γ-γ-coin.; deduced γ-ray energies, intensities, J, π, conversion coefficients. Comparison with systematics.

doi: 10.1088/1361-6471/aa6bb6
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2017RE05      Phys.Rev. C 95, 054319 (2017); Erratum Phys.Rev. C 95, 069902 (2017)

J.-M.Regis, J.Jolie, N.Saed-Samii, N.Warr, M.Pfeiffer, A.Blanc, M.Jentschel, U.Koster, P.Mutti, T.Soldner, G.S.Simpson, F.Drouet, A.Vancraeyenest, G.de France, E.Clement, O.Stezowski, C.A.Ur, W.Urban, P.H.Regan, Zs.Podolyak, C.Larijani, C.Townsley, R.Carroll, E.Wilson, L.M.Fraile, H.Mach, V.Paziy, B.Olaizola, V.Vedia, A.M.Bruce, O.J.Roberts, J.F.Smith, M.Scheck, T.Kroll, A.-L.Hartig, A.Ignatov, S.Ilieva, S.Lalkovski, W.Korten, N.Marginean, T.Otsuka, N.Shimizu, T.Togashi, Y.Tsunoda

Abrupt shape transition at neutron number N=60: B(E2) values in 94, 96, 98Sr from fast γ - γ timing

NUCLEAR REACTIONS 235U(n, Fγ), E=cold neutron beam; measured Eγ, Iγ, level half-lives by fast-timing γγ(t) method using EXILL and FATIMA spectrometer at ILL-Grenoble reactor facility. 94,96,98Sr; deduced levels, B(E2)values. Comparison with previous experimental values, and with Monte Carlo Shell-model calculations.

doi: 10.1103/PhysRevC.95.054319
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2017RO21      J.Phys.(London) G44, 104003 (2017)

S.Rothe, J.Sundberg, J.Welander, K.Chrysalidis, T.D.Goodacre, V.Fedosseev, S.Fiotakis, O.Forstner, R.Heinke, K.Johnston, T.Kron, U.Koster, Y.Liu, B.Marsh, A.Ringvall-Moberg, R.E.Rossel, C.Seiffert, D.Studer, K.Wendt, D.Hanstorp

Laser photodetachment of radioactive 128I1

NUCLEAR REACTIONS 128I(γ, X), E<3.1 eV; measured reaction products; deduced the electron affinity (EA) of a radioactive isotope.

doi: 10.1088/1361-6471/aa80aa
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2017RZ01      Phys.Rev. C 95, 064302 (2017)

T.Rzaca-Urban, K.Sieja, W.Urban, M.Czerwinski, A.Blanc, M.Jentschel, P.Mutti, U.Koster, T.Soldner, G.de France, G.S.Simpson, C.A.Ur

Structure of 90, 91Kr nuclei: Solving the puzzle of their population in fission

NUCLEAR REACTIONS 235U(n, Fγ), E=cold neutrons from PF1B facility of ILL-Grenoble; measured Eγ, Iγ, γγ-coin, γγ(θ) using EXILL array of 28 pairs of the eight clover detectors. 90,91Kr; deduced levels, J, π, multipolarity, mixing ratios. 142,143,144Ba; observed γ rays from complementary fission fragments. Comparison with large-scale shell-model calculations.

NUCLEAR STRUCTURE 90,91Kr; calculated levels, J, π, occupation of neutron and proton orbitals using large-scale shell-model. Systematics of positive-parity, yrare states in Z=32-44, N=52, 54 even-even nuclei.

doi: 10.1103/PhysRevC.95.064302
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2017SC06      Acta Phys.Pol. B48, 547 (2017)

M.Scheck, S.Mishev, V.Yu.Ponomarev, O.Agar, T.Beck, A.Blanc, R.Chapman, U.Gayer, L.P.Gaffney, E.T.Gregor, J.Keatings, P.Koseoglou, U.Koster, K.R.Mashtakov, D.O'Donnell, H.Pai, N.Pietralla, D.Savran, J.F.Smith, P.Spagnoletti, G.S.Simpson, M.Thurauf, V.Werner

β Decay as a New Probe for the Low-energy E1 Strength

RADIOACTIVITY 136I(β-); deduced discrete levels, γ transitions intensity, level population probability, branching ratios, B(E1) using published data. Compared with results from 136Xe(γ, γ').

NUCLEAR REACTIONS 136Xe(γ, γ'), E not given; deduced discrete transitions intensity, level population probability, branching ratios, B(E1) using published data.

doi: 10.5506/APhysPolB.48.547
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2017SP02      Phys.Rev. C 95, 021302 (2017)

P.Spagnoletti, G.S.Simpson, R.Carroll, J.-M.Regis, A.Blanc, M.Jentschel, U.Koster, P.Mutti, T.Soldner, G.de France, C.A.Ur, W.Urban, A.M.Bruce, F.Drouet, L.M.Fraile, L.P.Gaffney, D.G.Ghita, S.Ilieva, J.Jolie, W.Korten, T.Kroll, C.Larijani, S.Lalkovski, R.Lica, H.Mach, N.Marginean, V.Paziy, Zs.Podolyak, P.H.Regan, M.Scheck, N.Saed-Samii, G.Thiamova, C.Townsley, A.Vancraeyenest, V.Vedia, A.Gargano, P.Van Isacker

Half-life of the 15/2+ state of 135I A test of E2 seniority relations

NUCLEAR REACTIONS 235U(n, F)135I, E=cold neutrons at PF1B facility and high-flux reactor of the ILL-Grenoble; measured prompt Eγ, Iγ, half-life of (15/2+) state in 135I by γγ(t) using EXILL-FATIMA γ-detector array of Clover Ge and LaBr3 detectors. 135I; deduced levels, B(E2), configuration, E2 seniority relations between B(E2) values in neighboring nuclei.

NUCLEAR STRUCTURE 134Te, 135I; calculated levels, J, π, B(E2) by large-scale shell-model calculations; deduced large two-body component of the E2 operator, whereas small energy shifts due to the three-body component of the effective interaction.

doi: 10.1103/PhysRevC.95.021302
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2017UR03      Phys.Rev. C 96, 044333 (2017)

W.Urban, M.Czerwinski, J.Kurpeta, T.Rzaca-Urban, J.Wisniewski, T.Materna, L.W.Iskra, A.G.Smith, I.Ahmad, A.Blanc, H.Faust, U.Koster, M.Jentschel, P.Mutti, T.Soldner, G.S.Simpson, J.A.Pinston, G.de France, C.A.Ur, V.-V.Elomaa, T.Eronen, J.Hakala, A.Jokinen, A.Kankainen, I.D.Moore, J.Rissanen, A.Saastamoinen, J.Szerypo, C.Weber, J.Aysto

Shape coexistence in the odd-odd nucleus 98Y: The role of the g9/2 neutron extruder

NUCLEAR REACTIONS 235U(n, F), E=cold neutrons from PF1B facility at ILL Grenoble; measured Eγ, Iγ, γγ-coin, delayed γγ-coin, half-lives of several isomers in 98Y using the EXILL array at Grenoble. 98Y; deduced levels, isomers, J, π, bands, configurations, deformed and spherical isomers.

RADIOACTIVITY 248Cm, 252Cf(SF); measured Eγ, Iγ, γγ-coin, γγ(θ), γγ-coin with γ rays from fission partner 147La in 248Cm SF decay using Eurogam2 array at Grenoble and Gammasphere array at Argonne. 98Y; deduced levels, J, π, multipolarities. 98Sr, 98,98mY(β-)[from 235U(n, F), E=cold neutrons and using Lohengrin fission-fragment separator]; measured Eγ, Iγ, γγ-coin, γγ(θ), γγ(linear pol), half-lives of decays of 98Sr, 98Y and 98Y isomer, excitation energy of the 2.36-s isomer in 98Y by using JYFLTRAP Penning trap at Jyvaskyla accelerator facility, . 98Y, 98Zr; deduced levels, J, π, multipolarities, mixing ratios, β feedings, logft, configurations. Comparison of negative-parity levels in 98Y with Interacting Boson Fermion Fermion Model (IBFFM) and Quasi-Particle Rotor Model (QPRM) calculations.

doi: 10.1103/PhysRevC.96.044333
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2017VE05      Phys.Rev. C 96, 034311 (2017)

V.Vedia, V.Paziy, L.M.Fraile, H.Mach, W.B.Walters, A.Aprahamian, C.Bernards, J.A.Briz, B.Bucher, C.J.Chiara, Z.Dlouhy, I.Gheorghe, D.Ghita, P.Hoff, J.Jolie, U.Koster, W.Kurcewicz, R.Lica, N.Marginean, R.Marginean, B.Olaizola, J.-M.Regis, M.Rudigier, T.Sava, G.S.Simpson, M.Stanoiu, L.Stroe

Search for the 73Ga ground-state doublet splitting in the β decay of 73Zn

RADIOACTIVITY 73Zn(β-)[from U(p, F), E=1.4 GeV]; measured Eγ, Iγ, βγ- and γγ-coin, half-life of 73Zn from γ-decay curves, level half-lives by fast-timing βγγ(t) technique using Resonance Ionization Laser Ion Source (RILIS) and magnetic high-resolution mass separator (HRS) at ISOLDE-CERN. 73Ga; deduced levels, ground state doublet, J, π, β feedings, logft, B(M1), B(E2). 73Zn(IT); measured Eγ, half-life of the isomer; deduced no evidence for a 42-keV transition from the isomer. Comparison with previous measurements, and with shell-model calculations. Systematics of level structure in 71,73,75Ga.

doi: 10.1103/PhysRevC.96.034311
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2016BA13      Acta Phys.Pol. B47, 897 (2016)

P.Baczyk, W.Urban, D.Zlotowska, M.Czerwinski, T.Rzaca-Urban, M.Konieczka, A.Blanc, M.Jentschel, P.Mutti, U.Koster, T.Soldner, G.de France, G.Simpson, C.Ur

Near-yrast Excitations in Nucleus 83As: Tracing the Deformation in the 78Ni Region

NUCLEAR REACTIONS 235U(n, F)83As, E thermal; measured reaction products, Eγ, Iγ; deduced energy levels, J, π. Comparison with Nilsson model.

doi: 10.5506/APhysPolB.47.897
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