New insights into the nuclear structure in neutron-rich 112,114,115,116,117,118Pd

Luo, Y. X.; Rasmussen, J. O.; Hamilton, J. H.; Ramayya, A. V.; Frauendorf, S.; Hwang, J. K.; Stone, N. J.; Zhu, S. J.; Brewer, N. T.; Wang, E.; Lee, I. Y.; Liu, S. H.; TerAkopian, G. M.; Daniel, A. V.; Oganessian, Yu Ts.; Stoyer, M. A.; Donangelo, R.; Ma, W. C.; Cole, J. D.; Shi, Yue; Xu, F. R.

doi:10.1016/j.nuclphysa.2013.10.002

New insights into the nuclear structure in neutron-rich ^{112,114,115,116,117,118}Pd

Journal Article · Mon Oct 14 00:00:00 EDT 2013 · Nuclear Physics. A

DOI:https://doi.org/10.1016/j.nuclphysa.2013.10.002· OSTI ID:1814088

Luo, Y. X. ^[1]; Rasmussen, J. O. ^[2]; Hamilton, J. H. ^[3]; Ramayya, A. V. ^[3]; Frauendorf, S. ^[4]; Hwang, J. K. ^[3]; Stone, N. J. ^[5]; Zhu, S. J. ^[6]; Brewer, N. T. ^[3]; Wang, E. ^[3]; Lee, I. Y. ^[7]; Liu, S. H. ^[8]; TerAkopian, G. M. ^[9]; Daniel, A. V. ^[10]; Oganessian, Yu Ts. ^[11]; Stoyer, M. A. ^[12]; Donangelo, R. ^[13]; Ma, W. C. ^[14]; Cole, J. D. ^[15]; Shi, Yue ^[16] more »

Vanderbilt Univ., Nashville, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Vanderbilt Univ., Nashville, TN (United States)
Univ. of Notre Dame, IN (United States); Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
Univ. of Oxford (United Kingdom); Univ. of Tennessee, Knoxville, TN (United States)
Vanderbilt Univ., Nashville, TN (United States); Tsinghua Univ., Beijing (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Vanderbilt Univ., Nashville, TN (United States); Oak Ridge Associated Univ., Oak Ridge, TN (United States)
Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Vanderbilt Univ., Nashville, TN (United States); Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Facultad de Ingenieria, Montevideo (Uruguay)
Mississippi State Univ., Mississippi State, MS (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Beijing Univ. (China)

New level schemes of ^{112,114,115,116,117,118}Pd are established by means of γ-γ-γ, γ-γ-γ-γ and γ-γ(θ) measurements of prompt fission γ rays from ²⁵²Cf using the Gammasphere multidetector array. Spins/parities were assigned to levels based on γ-γ angular correlation measurements, level systematics and decay patterns. In the even-N isotopes ^112,114,116Pd, two sets of odd-parity bands were identified and extended with spins measured in each band. The oddparity bands with large level staggerings were interpreted as disturbed chirality with less pronounced triaxial deformations in the Pd isotopes than observed in the chiral symmetry breaking ^110,112Ru with maximum triaxiality. Onset of wobbling motion was identified from the sign of the signature splitting in the γ band of even-even ¹¹⁴Pd, and probably also in ¹¹⁶Pd. as first seen in the N = 68 isotone ¹¹²Ru. Maximal triaxiality in Ru and Pd isotopes is found to be reached for N = 68, ¹¹²Ru and ¹¹⁴Pd, 4 neutrons more than predicted in the theoretical calculations. The new data and TRS calculations allowed a systematic study of the band crossings in the even-N ^112,114,116Pd and odd-N ^115,117Pd isotopes. Here, we find a new overall, more complex shape evolution than previously proposed, now from triaxial prolate in ¹¹⁰Pd via triaxial oblate in ¹¹²Pd to nearly oblate in ^114,116Pd, with a large change of the triaxial deformation parameter γ toward nearly oblate in the (πg_9/2)² alignment in ^{114,115,116,117,118}Pd, and triaxial prolate - triaxial oblate shape coexisting bands in ¹¹⁵Pd.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); Tsinghua Univ.; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; FG02-95ER40934; FG05-88ER40407; W-7405-ENG-48

OSTI ID:: 1814088

Alternate ID(s):: OSTI ID: 22227819
OSTI ID: 1120806

Report Number(s):: LLNL-JRNL--823833; 1036995

Journal Information:: Nuclear Physics. A, Journal Name: Nuclear Physics. A Vol. 919; ISSN 0375-9474

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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112
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Gammasphere
band crossings
chirality
shape coexistence
shape transitions
triaxiality
wobbling motion
γ-γ-γ
γ-γ-γ-γ and γ-γ(θ) measurements

New insights into the nuclear structure in neutron-rich 112,114,115,116,117,118Pd

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References (62)

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New insights into the nuclear structure in neutron-rich ^{112,114,115,116,117,118}Pd