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Search: Author = J.Wisniewski

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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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2022RZ01      Phys.Rev. C 106, 024322 (2022)

T.Rzaca-Urban, K.Sieja, M.Czerwinski, J.Kurpeta, M.Pomorski, W.Urban, J.Wisniewski, M.Wroblewski, L.Canete, T.Eronen, S.Geldhof, A.Jokinen, A.Kankainen, I.D.Moore, D.Nesterenko, H.Penttila, I.Pohjalainen, S.Rinta-Antila, A.de Roubin, M.Vilen

Low-spin excitations in 89Br populated in β- decay of 89Se

RADIOACTIVITY 89Se(β-), (β-n)[from U(p, F), E=30 MeV, followed by separation of fragments using Ion Guide Isotope Separator On-Line (IGISOL) facility and JYFLTRAP at Jyvaskyla]; measured fission fragment yields, Eγ, Iγ, γγ-coin. 89Se; deduced J, π, T1/2, %β-n or Pn for g.s. decay. 89Br; deduced levels, J, π, multipolarities, β feedings, Gamow-Teller transition, logft, configurations, occupation of neutron and proton orbitals. 88Br; deduced levels, J, π. Comparison with large-scale shell-model calculations. Systematics of level energies, J, π in 83,85,87As, 69,71,73,75,77,79,81,83,85,87,89Br, 87,89,91Rb, 89,91,93Y, 91,93,95Nb.

doi: 10.1103/PhysRevC.106.024322
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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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2020UR02      Phys.Rev. C 102, 024318 (2020)

W.Urban, T.Rzaca-Urban, J.Wisniewski, J.Kurpeta, A.Plochocki, J.P.Greene, A.G.Smith, G.S.Simpson

New, low-energy excitations in 107Mo and 109Mo

RADIOACTIVITY 248Cm, 252Cf(SF); measured Eγ, Iγ, γγ-coin, half-lives of the isomer in 107Mo by γγ(t) using the Eurogam2 array for 248Cm(SF) experiment and Gammasphere array for 252Cf(SF). 107,109Mo; deduced levels, isomers, J, π, Jπ for ground states and isomers, total conversion coefficients for an isomeric transition in 107Mo, configurations. Systematics of low-energy excitations and γ deformation parameters in Mo isotopes.

doi: 10.1103/PhysRevC.102.024318
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2019KU16      Phys.Rev. C 100, 034316 (2019)

J.Kurpeta, A.Plochocki, W.Urban, A.Abramuk, L.Canete, T.Eronen, A.Fijalkowska, S.Geldhof, K.Gotowicka, A.Jokinen, A.Kankainen, I.D.Moore, D.Nesterenko, H.Penttila, I.Pohjalainen, M.Pomorski, M.Reponen, S.Rinta-Antila, A.de Roubin, T.Rzaca-Urban, M.Vilen, J.Wisniewski

First β-decay scheme of 107Nb: New insight into the low-energy levels of 107Mo

RADIOACTIVITY 107Nb(β-)[from U(p, F), E=25 MeV from the K-130 cyclotron at the University of Jyvaskyla, followed by separation of fission fragments using IGISOL-4 for mass separation, and JYFLTRAP Penning trap for isobaric purification]; measured yields of Mo and Nb ions, Eγ, Iγ, γγ- and βγ-coin, γ(Kα x-ray)-coin, half-life of the decay of 107Nb using a plastic scintillator for β particles and three Ge detectors for low-energy γ rays. 107Mo; deduced levels, J, π, bands, K-conversion coefficients for three transitions, total conversion coefficient for one transition, multipolarities, β feedings, logft. Systematics of energies of the first and second 1/2+ levels in N=55-71, Z(even)=40-46. Comparison of the experimental γ-ray transition intensities between low-lying levels in 105Mo and 107Mo. Discussed the revised energy of the 420-ns isomer.

doi: 10.1103/PhysRevC.100.034316
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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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2019UR01      Phys.Rev. C 99, 064325 (2019)

W.Urban, T.Rzaca-Urban, J.Wisniewski, I.Ahmad, A.G.Smith, G.S.Simpson

Structure of 0+ excitations in the mass A ≈ 100 region: 0+2 bands in 98Sr and 100Zr

RADIOACTIVITY 248Cm, 252Cf(SF); measured Eγ, Iγ, γγ-coin, and γγ(θ)(DCO) using the Eurogam2 and Gammasphere arrays for γ detection. 98Sr, 100Zr; deduced levels, J, π, B(E2), bands, configurations. Systematics of 0+ states, and β deformation in 90,92,94,96,98,100Sr, 92,94,96,98,100,102Zr, 94,96,98,100,102,104,106Mo, 96,98,100,102,104,106,108,110Ru, 100,104,106,108,110,112Pd, 106,108,110,112,114Cd, 108,110,112,114,116Sn.

doi: 10.1103/PhysRevC.99.064325
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2019UR02      Phys.Rev. C 100, 014319 (2019)

W.Urban, T.Rzaca-Urban, J.Wisniewski, A.G.Smith, G.S.Simpson, I.Ahmad

First observation of γ-soft and triaxial bands in Zr isotopes

RADIOACTIVITY 248Cm, 252Cf(SF); measured Eγ, Iγ, γγ-coin, and γγ(θ) using the Eurogam2 array at ILL-Grenoble, and Gammasphere array at ANL. 100,102Zr; deduced high-spin levels, J, π, multipolarities, mixing ratios, triaxial and γ bands, alignments and staggering in bands, γ softness and triaxiality in Zr isotopes.

doi: 10.1103/PhysRevC.100.014319
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2019WI11      Phys.Rev. C 100, 054331 (2019)

J.Wisniewski, W.Urban, M.Czerwinski, J.Kurpeta, A.Plochocki, M.Pomorski, T.Rzaca-Urban, K.Sieja, L.Canete, T.Eronen, S.Geldhof, A.Jokinen, A.Kankainen, I.D.Moore, D.A.Nesterenko, H.Penttila, I.Pohjalainen, S.Rinta-Antila, A.de Roubin, M.Vilen

Excited states in 87Br populated in β decay of 87Se

RADIOACTIVITY 87Se(β-)[from Th(p, F), E=25 MeV using the IGISOL technique, then separated on a dipole magnet and JYFLTRAP Penning trap setup]; measured Eγ, Iγ, γγ-coin using an array of six high-resolution Ge detectors with thin carbon windows at the University of Jyvaskyla. 87Br; deduced levels, J, π, β feedings, logft values, configurations. 87Se; deduced ground-state Jπ. Comparison with large-scale shell-model calculations, and with previous experimental results.

doi: 10.1103/PhysRevC.100.054331
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2018KU13      Phys.Rev. C 98, 024318 (2018)

J.Kurpeta, A.Plochocki, W.Urban, T.Eronen, A.Jokinen, A.Kankainen, V.S.Kolhinen, I.D.Moore, H.Penttila, M.Pomorski, S.Rinta-Antila, T.Rzaca-Urban, J.Wisniewski

Excited levels in the multishaped 117Pd nucleus studied via β decay of 117Rh

RADIOACTIVITY 117Rh(β-)[from 238U(p, F), E=25 MeV followed by separation of 117Rh using IGISOL-4 mass separator coupled to the JYFLTRAP Penning trap at Jyvaskyla]; measured Eγ, Iγ, Pd x-rays, βγ-, (x-ray)γ- and γγ-coin, half-life of 117Rh decay from γ-decay curves using plastic scintillator for β detection and Ge detectors for γ detection. 117Pd; deduced levels, J, π, β feedings, logft values, configurations, Gamow-Teller transition strengths. 117Rh; deduced preliminary J and π of ground state from theoretical calculations and systematics of Rh isotopes. Systematics of low-spin levels in odd A=101-119 Rh isotopes and odd A=103-117 Pd isotopes, isomeric states and γ transitions in odd A=105-117 Pd isotopes, and negative-parity levels in odd A, N=57-71 Mo, Ru, and Pd isotopes.

doi: 10.1103/PhysRevC.98.024318
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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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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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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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2017CZ01      Phys.Rev. C 95, 024321 (2017)

M.Czerwinski, K.Sieja, T.Rzaca-Urban, W.Urban, A.Plochocki, J.Kurpeta, J.Wisniewski, H.Penttila, A.Jokinen, S.Rinta-Antila, L.Canete, T.Eronen, J.Hakala, A.Kankainen, V.S.Kolhinen, J.Koponen, I.D.Moore, I.Pohjalainen, J.Reinikainen, V.Simutkin, A.Voss, I.Murray, C.Nobs

Penning-trap-assisted study of excitations in 88Br β decay of 88Se

RADIOACTIVITY 88Se(β-)[from U(p, F), E=30 MeV using Ion Guide Isotope Separator On-Line (IGISOL) facility and JYFLTRAP at Jyvaskyla]; measured yields of fission fragments, Eγ, Iγ, βγ- and γγ-coin, half-life of an isomer by γ(t). 88Br; deduced levels, J, π, total conversion coefficients from intensity balances, multipolarities, β feedings, log ft, configurations, comparison with large-scale shell-model calculations.

NUCLEAR STRUCTURE 88Br; calculated levels, J, π, occupation of neutron and proton orbitals using large-scale shell-model. Comparison with experimental data.

doi: 10.1103/PhysRevC.95.024321
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2017NA15      Phys.Rev. C 95, 064303 (2017)

H.Naidja, F.Nowacki, B.Bounthong, M.Czerwinski, T.Rzaca-Urban, T.Roginski, W.Urban, J.Wisniewski, K.Sieja, A.G.Smith, J.F.Smith, G.S.Simpson, I.Ahmad, J.P.Greene

New excitations in 142Ba and 144Ce: Evolution of γ bands in the N=86 isotones

RADIOACTIVITY 252Cf(SF); 144La(β-)[from 252Cf SF]; measured Eγ, Iγ, γγ-coin, γγ(θ) using Gammasphere array at Argonne National Laboratory. 142Ba, 144Ce; deduced high-spin levels, J, π, multipolarity, mixing ratios. 140Xe; deduced multipolarity and mixing ratios from γγ(θ) data. Comparison with large-scale shell-model calculations.

NUCLEAR STRUCTURE 142Ba, 144Ce; calculated levels, J, π, quadrupole moments, B(E2), potential energy surfaces in (β, γ) plane using large-scale shell-model. Comparison with experimental data.

doi: 10.1103/PhysRevC.95.064303
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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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2017WI15      Phys.Rev. C 96, 064301 (2017)

J.Wisniewski, W.Urban, T.Rzaca-Urban, A.G.Smith, J.F.Smith, G.S.Simpson, I.Ahmad, J.P.Greene

Parity-doublet structure in the 14757La90 nucleus

RADIOACTIVITY 252Cf(SF); measured Eγ, Iγ, γγγ-coin, γγ(θ) using Gammasphere array at ANL. 147La; deduced high-spin levels, J, π, multipolarities, multipole mixing ratios, parity-doublet structures, alignments, configurations, B(E1)/B(E2) ratios, intrinsic electric dipole moment D0, octupole correlations, Systematics of 3/2+, 5/2+, 7/2+, 3/2-, 7/2- and 11/2- levels in 139,141,143,145,147,149La.

doi: 10.1103/PhysRevC.96.064301
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