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NSR database version of May 24, 2024.

Search: Author = L.Knafla

Found 32 matches.

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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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2024VO01      Phys.Rev. C 109, 024325 (2024)

F.von Spee, M.Beckers, A.Blazhev, A.Dewald, F.Dunkel, A.Esmaylzadeh, C.Fransen, G.Hackenberg, J.Jolie, L.Knafla, C.-D.Lakenbrink, M.Schiffer, N.Warr, M.Weinert

Structure of low-lying states in 116Te

doi: 10.1103/PhysRevC.109.024325
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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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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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2023HA29      Phys.Rev. C 108, 024305 (2023)

A.Harter, A.Esmaylzadeh, L.Knafla, C.Fransen, F.v.Spee, J.Jolie, M.Ley, V.Karayonchev, J.Fischer, A.Pfeil

Lifetime measurements in low yrast states and spectroscopic peculiarities in 182Os

NUCLEAR REACTIONS 174Yb(12C, 4n)182Os, E=66 MeV; measured Eγ, Iγ, γγ-coin. 182Os; deduced levels, J, π, T1/2 of yrast 2+, 4+ and 6+ excited states, B(E2), quadrupole deformation parameter. Comparison to interacting boson model 1 (IBM-1) based calculations. Systematics of level energies for Os isotopes - 180,182,184,186Os and for N=106 isotones Hf, W, Os, Pt, Hg. Obtained values support the interpretation of 182Os as a rigid rotor. HORUS spectrometer equipped with 10 LaBr3(Ce) scintillators and 8 HPGe detectors at Cologne 10 MV FN-Tandem accelerator.

doi: 10.1103/PhysRevC.108.024305
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2023KA31      Phys.Rev. C 108, 054302 (2023)

V.Karayonchev, J.Jolie, D.Bittner, M.Beckers, A.Esmaylzadeh, J.Fischer, C.Fransen, J.Garbe, L.Knafla, C.-D.Lakenbrink, M.Ley

Lifetime measurements in 206Po with a shell-model interpretation

doi: 10.1103/PhysRevC.108.054302
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2023KN04      Nucl.Instrum.Methods Phys.Res. A1052, 168279 (2023)

L.Knafla, A.Harter, M.Ley, A.Esmaylzadeh, J.-M.Regis, D.Bittner, A.Blazhev, F.von Spee, J.Jolie

Improving fast-timing time-walk calibration standards: Lifetime measurement of the 2+1 state in 152Gd

RADIOACTIVITY 152Eu(β-); measured decay products, Eγ, Iγ; deduced γ-ray energies, the lifetime of the 2+ state. Comparison with available data. Fast-timing lifetime measurements.

doi: 10.1016/j.nima.2023.168279
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2023LA11      Eur.Phys.J. A 59, 290 (2023)

C.-D.Lakenbrink, M.Beckers, A.Blazhev, A.Dewald, F.Dunkel, A.Esmaylzadeh, Ch.Fransen, J.Jolie, L.Knafla, C.Muller-Gatermann, F.von Spee, K.-O.Zell

Lifetime measurement of excited states in 116Xe

NUCLEAR REACTIONS 102Pd(16O, 2n), E=62 MeV; measured reaction products, Eγ, Iγ, γ-γ-coin.; deduced γ-ray energies, J, π, level T1/2, B(E2), The recoil-distance Doppler-shift (RDDS) technique, the FN-tandem accelerator at the University of Cologne, Germany, using the Cologne coincidence plunger device.

doi: 10.1140/epja/s10050-023-01204-3
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2023LE18      Phys.Rev. C 108, 064313 (2023)

M.Ley, L.Knafla, J.Jolie, A.Esmaylzadeh, A.Harter, A.Blazhev, C.Fransen, A.Pfeil, J.-M.Regis, P.Van Isacker

Lifetime measurements in 92Mo: Investigation of seniority conservation in the N=50 isotones

doi: 10.1103/PhysRevC.108.064313
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2023PA40      Eur.Phys.J. A 59, 276 (2023)

G.Pasqualato, S.Ansari, J.S.Heines, V.Modamio, A.Gorgen, W.Korten, J.Ljungvall, E.Clement, J.Dudouet, A.Lemasson, T.R.Rodriguez, J.M.Allmond, T.Arici, K.S.Beckmann, A.M.Bruce, D.Doherty, A.Esmaylzadeh, E.R.Gamba, L.Gerhard, J.Gerl, G.Georgiev, D.P.Ivanova, J.Jolie, Y.-H.Kim, L.Knafla, A.Korichi, P.Koseoglou, M.Labiche, S.Lalkovski, T.Lauritsen, H.-J.Li, L.G.Pedersen, S.Pietri, D.Ralet, J.M.Regis, M.Rudigier, S.Saha, E.Sahin, S.Siem, P.Singh, P.-A.Soderstrom, C.Theisen, T.Tornyi, M.Vandebrouck, W.Witt, M.Zielinska, D.Barrientos, P.Bednarczyk, G.Benzoni, A.J.Boston, H.C.Boston, A.Bracco, B.Cederwall, M.Ciemala, G.de France, C.Domingo-Pardo, J.Eberth, A.Gadea, V.Gonzalez, A.Gottardo, L.J.Harkness-Brennan, H.Hess, D.S.Judson, A.Jungclaus, S.M.Lenzi, S.Leoni, R.Menegazzo, D.Mengoni, C.Michelagnoli, D.R.Napoli, J.Nyberg, Zs.Podolyak, A.Pullia, F.Recchia, P.Reiter, K.Rezynkina, M.D.Salsac, E.Sanchis, M.Senyigit, M.Siciliano, J.Simpson, D.Sohler, O.Stezowski, J.J.Valiente-Dobon, D.Verney

Shape evolution in even-mass 98-104Zr isotopes via lifetime measurements using the γγ coincidence technique

NUCLEAR REACTIONS 9Be(238U, X)98Zr/100Zr/102Zr/104Zr, E=6.2 MeV/nucleon; measured reaction products, Eγ, Iγ, γ-γ-coin. 104Mo, 102Nb; deduced γ-ray energies and relative intensities, J, π, level T1/2, B(E2), shape coexistence. Comparison with calculated values. The Differential Decay Curve Method (DDCM), the Recoil Distance Doppler Shift technique. The magnetic spectrometer VAMOS++, GANIL, the Orsay Universal Plunger system.

doi: 10.1140/epja/s10050-023-01172-8
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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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2023ST05      Phys.Rev. C 108, 014316 (2023)

K.Stoychev, M.Djongolov, V.Karayonchev, G.Rainovski, M.Ley, J.Jolie, D.Bittner, A.Blazhev, F.Dunkel, A.Esmaylzadeh, C.Fransen, J.Garbe, L.M.Gerhard, R.-B.Gerst, K.Geusen, K.A.Gladnishki, G.Hafner, D.Kalaydjieva, L.Klockner, L.Knafla, D.Kocheva, L.Kornwebel, C.Muller-Gatermann, E.Nikodem, J.-M.Regis, K.Schomacker, M.Stoyanova

X-ray-γ fast-timing lifetime measurement of the 6+1 state in 206Po

RADIOACTIVITY 206Po(IT)[from successive EC decay of 206Rn(EC)-206At(EC) produced in 194Pt(16O, 4n)206Rn, E=84 MeV]; measured X-rays, Eγ, Iγ, (X-rays)γ-coin, γγγ-coin. 206Po; deduced levels, J, π, T1/2 of the 4+ and 6+ excited states, B(E2). Lifetimes extracted via the generalized centroid difference (GCD) method. Systematics of the B(E2) for even-even Po isotopes with N<126. HORUS spectrometer consisting of 8 coaxial HPGe and 11 LaBr detectors at the FN-Tandem facility (Institute for Nuclear Physics, University of Cologne).

doi: 10.1103/PhysRevC.108.014316
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2022DR04      Phys.Rev. C 106, 024329 (2022)

M.Droste, A.Blazhev, P.Reiter, K.Arnswald, M.Beckers, C.Fransen, R.Hetzenegger, R.Hirsch, L.Kaya, L.Knafla, L.Lewandowski, C.Muller-Gatermann, P.Petkov, D.Rosiak, M.Seidlitz, B.Siebeck, A.Vogt, N.Warr, K.Wolf

Lifetime measurements in the ground-state band in 104Pd

NUCLEAR REACTIONS 96Zr(12C, 4n)104Pd, E=55 MeV; measured Eγ, Iγ, γγ-coin, level T1/2 by recoil distance Doppler-shift (RDDS) method and differential decay-curve method (DDCM) using 12 HPGe detectors and Cologne coincidence-plunger device at the FN tandem accelerator of the University of Cologne. 104Pd; deduced levels, J, π, T1/2 of levels up to 12+ in the g.s. yrast band, B(E2). Comparison with large-scale shell-model calculations (LSSM) with SR88MHJM interaction, and with available previous experimental values.

NUCLEAR STRUCTURE 96,98,100,102,104,106Pd; calculated energy(first 4+)/energy(first 2+), B(E2)(first 4+)/B(E2)(first 2+), excitation energies and B(E2) up to 10+ in the g.s. band. 104Pd; calculated Eγ and B(E2) for levels up to 26+ in the g.s. band, occupation numbers for first 8+, 10+ and 12+, and second 10+ levels. Large-scale shell-model calculations (LSSM) with SR88MHJM interaction. Comparison with available experimental data.

doi: 10.1103/PhysRevC.106.024329
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2022ES05      Phys.Rev. C 106, 064323 (2022)

A.Esmaylzadeh, A.Blazhev, K.Nomura, J.Jolie, M.Beckers, C.Fransen, R.-B.Gerst, A.Harter, V.Karayonchev, L.Knafla, M.Ley, F.von Spee

Investigation of γ softness: Lifetime measurements in 104, 106Ru

NUCLEAR REACTIONS 104Ru(18O, 18O), (18O, 16O), E=57 MeV; measured reaction products, Eγ, Iγ, (particle)γ-coin. 104,106Ru; deduced levels, J, π, T1/2 of low-lying excited states, B(E2), B(M1), shape invariants. Recoil-distance Doppler shift technique. Comparison to mapped-IBM calculation based on a microscopic energy density functional, to the values obtained with Wilets-Jean γ-soft model and to previous experimental data. Results indicate γ-softness and point on traixilaity in 104,106Ru. Cologne plunger device in conjunction with 11 HPGe detectors arranged in backward and forward rings combined with 6 PIN diodes for detecting the backscattered beam-like light recoiling fragments 10 MV FN-Tandem accelerator.

doi: 10.1103/PhysRevC.106.064323
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2022HA24      Phys.Rev. C 106, 024326 (2022)

A.Harter, L.Knafla, G.Friessner, G.Hafner, J.Jolie, A.Blazhev, A.Dewald, F.Dunkel, A.Esmaylzadeh, C.Fransen, V.Karayonchev, K.Lawless, M.Ley, J.-M.Regis, K.O.Zell

Lifetime measurements in the tungsten isotopes 176, 178, 180W

NUCLEAR REACTIONS 164Dy(16O, 4n)176W, E=80 MeV; 172Yb(9Be, 3n)178W, E=40 MeV; 181Ta(p, 2n)180W, E=16 MeV; measured E(ce), Eγ, (ce)γ-coin, (ce)γγ-coin, γγ-coin, level T1/2 by (ce)γ(t) fast-timing method, and by recoil-distance Doppler-shift method using Cologne iron-free Orange spectrometer for conversion electrons, Cologne HORUS spectrometer for γ radiation, and Cologne coincidence plunger setup at the 10 MV FN Tandem accelerator of IKP-Cologne. 176,178,180W; deduced levels, J, π, T1/2, B(E2) of yrast positive-parity states up to 10+ for 176W and up to 8+ for 178,180W. Comparison with previous available experimental results, and with IBM-1 model calculations. Experimental and theoretical (by IBM-1 model with SU(3) and X(5) limits) systematics of excitation energies, deformation parameter β, quadrupole moment, B(E2), E(first 4+)/E(first 2+), B(E2)(first 4+)/B(E2)(first 2+) for 168,170,172,174,176,178,180,182,184,186W.

doi: 10.1103/PhysRevC.106.024326
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2022KA40      Phys.Rev. C 106, 044321 (2022)

V.Karayonchev, A.Blazhev, J.Jolie, A.Dewald, A.Esmaylzadeh, C.Fransen, G.Hafner, L.Knafla, C.Muller-Gatermann, G.Rainovski, J.-M.Regis, K.Schomacker, P.Van Isacker

New aspects of the low-energy structure of 211At

NUCLEAR REACTIONS 209Bi(16O, 14C)211At, E=84 MeV; measured recoiling beam-like nuclei, Eγ, Iγ, (particle)γ-coin. 211At; deduced levels, J, π, high-spin states, T1/2 of the excited states, B(E2). Recoil-distance Doppler shift and the Doppler-shift attenuation methods. Comparison to two shell-model calculations, one using the Kuo-Herling residual interaction and the other using a single-j approximation for protons in the 0h9/2 orbital. Comparison to other experimental data. Cologne plunger device with 11 HPGe detectors positioned in two rings at FN-Tandem accelerator (University of Cologne).

doi: 10.1103/PhysRevC.106.044321
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2022KA52      Phys.Rev. C 106, 064305 (2022)

V.Karayonchev, G.Rainovski, J.Jolie, A.Blazhev, A.Dewald, A.Esmaylzadeh, C.Fransen, P.John, L.Knafla, D.Kocheva, K.Schomacker, V.Werner, H.Naidja

Lifetime measurements in the yrast band of 212Po with a shell-model investigation

NUCLEAR REACTIONS 208Pb(18O, 14C)212Po, E=85 MeV; measured reaction products, Eγ, Iγ, γγ-coin, (particle)γ-coin. 212Po; deduced levels, J, π, B(E2), T1/2 of first 4+ and 6+ states; calculated levels, J, π, B(E2). Lifetimes obtained with recoil-distance Doppler-shift (RDDS) method. Shell-model calculations performed using H208 and KHPE interaction. Cologne plunger device, array of 11 HPGe detectors and array of 6 photovoltaic pin-diodes at FN-TANDEM accelerator (University of Cologne).

doi: 10.1103/PhysRevC.106.064305
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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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2021ES04      Phys.Rev. C 103, 054324 (2021)

A.Esmaylzadeh, V.Karayonchev, G.Hafner, J.Jolie, M.Beckers, A.Blazhev, A.Dewald, C.Fransen, A.Goldkuhle, L.Knafla, C.Muller-Gatermann

Triaxiality in the mid-shell nucleus 112Pd

NUCLEAR REACTIONS 110Pd(18O, 16O)112Pd, E=56 MeV; measured Eγ, Iγ, (particle)γ-coin, half-lives of the 2+, 4+ and 6+ g.s. band members and 2+ level in γ band by recoil-distance Doppler shift (RDDS) and DDCM analysis methods using Cologne Plunger device and an array of 11 HPGe detectors at the Cologne FN Tandem accelerator facility. 112Pd; deduced levels, B(E2). Comparison with IBM-1 model calculations.

NUCLEAR STRUCTURE 112Pd; calculated levels, J, π, B(E2) for 2+, 4+, 6+, 8+ and 10+ states of the yrast band and 2+, 3+, 4+, 5+, 6+, 7+ and 8+ states of the γ-band using the Interacting Boson Model (IBM-1), the Davydov Filipov Model and the Wilets-Jean gamma-unstable model (or γ-soft model); deduced rigid triaxial nucleus and indicators for a γ-soft nucleus.

doi: 10.1103/PhysRevC.103.054324
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2021ES09      Phys.Rev. C 104, 064314 (2021)

A.Esmaylzadeh, V.Karayonchev, K.Nomura, J.Jolie, M.Beckers, A.Blazhev, A.Dewald, C.Fransen, R.-B.Gerst, G.Hafner, A.Harter, L.Knafla, M.Ley, L.M.Robledo, R.Rodriguez-Guzman, M.Rudigier

Lifetime measurements to investigate γ softness and shape coexistence in 102Mo

NUCLEAR REACTIONS 100Mo(18O, 16O)102Mo, E=52 MeV; measured Eγ, Iγ, γγ-coin, T1/2 of levels by recoil-distance Doppler-shift method using an array of eleven HPGe detectors, and Cologne Plunger device at the Cologne FN Tandem accelerator facility. 102Mo; deduced levels, J, π, B(E2), B(M1), E0 transition probability; calculated deformation-energy surface in the (β, γ) plane. Comparison of levels and B(E2) with mapped interacting boson model (IBM) calculations, with microscopic input from Gogny mean-field. Systematics of 0+ and first 2+ states and B(E2) values in N=52-64, Sr, Zr, Mo and Ru isotopes. Discussed shape coexistence and γ-softness.

doi: 10.1103/PhysRevC.104.064314
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2021HA23      Eur.Phys.J. A 57, 174 (2021)

G.Hafner, A.Esmaylzadeh, J.Jolie, J.-M.Regis, C.Muller-Gatermann, A.Blazhev, C.Fransen, R.-B.Gerst, V.Karayonchev, L.Knafla, N.Saed-Samii, K.-O.Zell

Lifetime measurements in 182Pt using γ-γ fast-timing

NUCLEAR REACTIONS 170Yb(16O, 4n), E=87 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, half lives, B(E2). Comparison with theoretical calculations in the framework of the sd-IBM with and without configuration mixing, γ-γ fast-timing technique.

doi: 10.1140/epja/s10050-021-00492-x
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2021KA19      Phys.Rev. C 103, 044309 (2021)

V.Karayonchev, M.Stoyanova, G.Rainovski, J.Jolie, A.Blazhev, M.Djongolov, A.Esmaylzadeh, C.Fransen, K.Gladnishki, L.Knafla, D.Kocheva, L.Kornwebel, J.-M.Regis, G.De Gregorio, A.Gargano

Lifetimes and structures of low-lying negative-parity states of 209Po

RADIOACTIVITY 209At(EC), (β+)[from successive α and ϵ decay of 213Fr, produced in 206Pb(11B, 4n)213Fr, E=56 MeV at the FN-Tandem facility of University of Cologne]; measured Eγ, Iγ, γγ-coin, level half-lives by γγ(t) fast-timing method and analyzed by generalized centroid difference (GCD) method using eight HPGe detectors and 12 LaBr scintillators, with six of these placed inside BGO anti-Compton shields. 209Po; deduced levels, J, π, B(M1), B(E2). Comparison with shell-model calculation using a microscopic effective interaction derived from the realistic CD-Bonn potential.

NUCLEAR STRUCTURE 209Po; calculated proton single-particle and neutron single-hole energies, levels, J, π, B(M1), B(E2), magnetic dipole and electric quadrupole moments, orbital composition and one-neutron pick-up spectroscopic factors of selected states, E2 matrix elements. Shell-model calculations with a realistic effective interaction derived from the CD-Bonn nucleon-nucleon potential within the framework of Q-box folded-diagram approach. Comparison with experimental data.

doi: 10.1103/PhysRevC.103.044309
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2020KA63      Phys.Rev. C 102, 064314 (2020)

V.Karayonchev, J.Jolie, A.Blazhev, A.Dewald, A.Esmaylzadeh, C.Fransen, G.Hafner, L.Knafla, J.Litzinger, C.Muller-Gatermann, J.-M.Regis, K.Schomacker, A.Vogt, N.Warr, A.Leviatan, N.Gavrielov

Tests of collectivity in 98Zr by absolute transition rates

NUCLEAR REACTIONS 96Zr(18O, 16O)98Zr, E=50 MeV; measured recoiling light fragments using an array of six solar cells, Eγ, Iγ, (particle)γ-coin, level half-lives by Doppler-shift recoil-distance (RDDS) method and analysis by differential decay curve method (DDCM) using an array of 11 HPGe detectors and Cologne Plunger device at the Cologne 10 MV FN Tandem accelerator. 98Zr; deduced levels, J, π, B(E2). Comparison with Monte Carlo shell model (MCSM), and interacting boson model with configuration mixing (IBM-CM) calculations, and with previous experimental data. Systematics of energies and B(E2) values of the first 2+ states in 90,92,94,96,98,100Sr, 92,94,96,98,100,102,104,106Zr.

doi: 10.1103/PhysRevC.102.064314
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2020KN03      Phys.Rev. C 102, 044310 (2020)

L.Knafla, G.Hafner, J.Jolie, J.-M.Regis, V.Karayonchev, A.Blazhev, A.Esmaylzadeh, C.Fransen, A.Goldkuhle, S.Herb, C.Muller-Gatermann, N.Warr, K.O.Zell

Lifetime measurements of 162Er: Evolution of collectivity in the rare-earth region

NUCLEAR REACTIONS 154Sm(12C, 4n)162Er, E=62 MeV; measured Eγ, Iγ, γγ-coin, half-life of 7(-) isomer by γ(t), level half-lives by γγ(t) fast-timing technique using the HORUS spectrometer with eight HPGe detectors and eight LaBr3(Ce) scintillation detectors at the 10 MV FN-Tandem accelerator of the University of Cologne. 162Er; deduced levels, J, π, B(E2). Comparison with confined β soft model and the interacting boson model calculations. Systematics of B(E2) values transition quadrupole moments and β2 deformation parameters for 158,160,162,164,166,168,170Er.

doi: 10.1103/PhysRevC.102.044310
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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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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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2019KA13      Phys.Rev. C 99, 024326 (2019)

V.Karayonchev, A.Blazhev, A.Esmaylzadeh, J.Jolie, M.Dannhoff, F.Diel, F.Dunkel, C.Fransen, L.M.Gerhard, R.-B.Gerst, L.Knafla, L.Kornwebel, C.Muller-Gatermann, J.-M.Regis, N.Warr, K.O.Zell, M.Stoyanova, P.Van Isacker

Lifetimes in 211At and their implications for the nuclear structure above 208Pb

NUCLEAR REACTIONS 208Pb(6Li, 3n), E=34 MeV; measured Eγ, Iγ, γγ-coin, half-lives of 13/2-, 17/2- and 23/2- levels in 211At by γγ-coin fast timing technique using HPGe detectors and LaBr3(Ce) scintillators for γ-rays at the Institute for Nuclear Physics, University of Cologne. 211At; deduced levels, B(M1), B(E2). Comparison with shell model calculations, and previous experimental values.

NUCLEAR STRUCTURE 209Bi, 210Po, 211At; calculated B(E2), magnetic dipole moments, B(M1) using two shell-model calculations: semiempirical interaction for three particles in a single j=9/2 shell, and the modified Kuo-Herling interaction in a multi-j model space. Comparison with experimental values.

doi: 10.1103/PhysRevC.99.024326
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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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2019ST13      Phys.Rev. C 100, 064304 (2019)

M.Stoyanova, G.Rainovski, J.Jolie, N.Pietralla, A.Blazhev, M.Beckers, A.Dewald, M.Djongolov, A.Esmaylzadeh, C.Fransen, L.M.Gerhard, K.A.Gladnishki, S.Herb, P.R.John, V.Karayonchev, J.M.Keatings, R.Kern, L.Knafla, D.Kocheva, L.Kornwebel, Th.Kroll, M.Ley, K.M.Mashtakov, C.Muller-Gatermann, J.-M.Regis, M.Scheck, K.Schomacker, J.Sinclair, P.Spagnoletti, C.Surder, N.Warr, V.Werner, J.Wiederhold

Lifetimes of the 4+1 states of 206Po and 204Po: A study of the transition from noncollective seniority-like mode to collectivity

NUCLEAR REACTIONS 197Au(11B, 4n)204Po, E=55 MeV; 198Pt(12C, 4n)206Po, E=65 MeV; measured Eγ, Iγ, γγ-coin, level half-lives by γγ(t) fast timing technique using the HORUS spectrometer of the FN Tandem facility at the University of Cologne. 204,206Po; deduced levels, J, π, B(E2) for the first 4+ states in both the isotopes, and for the first 2+ in 204Po, configurations; discussed transition from single-particle seniority like mode to collective mode. Comparison with two-state mixing calculations. Systematics of energies, R4/2 ratios, B(E2) and magnetic moments for the yrast levels in 200,202,204,206,208,210Po.

doi: 10.1103/PhysRevC.100.064304
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2018ES04      Phys.Rev. C 98, 014313 (2018)

A.Esmaylzadeh, L.M.Gerhard, V.Karayonchev, J.-M.Regis, J.Jolie, M.Bast, A.Blazhev, T.Braunroth, M.Dannhoff, F.Dunkel, C.Fransen, G.Hafner, L.Knafla, M.Ley, C.Muller-Gatermann, K.Schomacker, N.Warr, K.-O.Zell

Lifetime determination in 190, 192, 194, 196Hg via γ-γ fast-timing spectroscopy

NUCLEAR REACTIONS 178Hf(16O, 4n)190Hg, E=87 MeV; 184W(12C, 4n)192Hg, E=66 MeV; 186W(12C, 4n)194Hg, E=64 MeV; 197Au(p, 2n)196Hg, E=17 MeV; measured Eγ, Iγ, level half-lives of first 2+ and 4+ states in 190,192,194,196Hg, first 7- in 192Hg, first 9- in 194Hg and first 5- in 196Hg by γγ-coin fast-timing technique using HORUS array and LaBr3(Ce) detectors at the Cologne University Institute of Nuclear Physics 190,192,194,196Hg; deduced levels, J, π, B(E2), B(E1). Comparison with theoretical calculations using interacting boson model configuration mixing (IBM-CM), and interacting boson model-2 (IBM-2). Systematics of excitation energies of yrast states, E(first 4+)/E(first 2+) ratios, and B(E2) for first 2+ and 4+ states in A=172-204 Hg isotopes.

doi: 10.1103/PhysRevC.98.014313
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