New insights into the nuclear structure in neutron-rich 112,114,115,116,117,118Pd
- 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 112,114,115,116,117,118Pd 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 (πg9/2)2 alignment in 114,115,116,117,118Pd, and triaxial prolate - triaxial oblate shape coexisting bands in 115Pd.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); Tsinghua Univ.; National Natural Science Foundation of China (NSFC)
- Grant/Contract Number:
- AC52-07NA27344; FG05-88ER40407; FG02-95ER40934; AC07-761O1570; W-7405-ENG48; 2007CB815005; 10975082; 11175095; 20100002110077
- OSTI ID:
- 1814088
- Report Number(s):
- LLNL-JRNL-823833; 1036995; TRN: US2213398
- Journal Information:
- Nuclear Physics. A, Vol. 919; ISSN 0375-9474
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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