Journal
PHYSICS LETTERS B
Volume 795, Issue -, Pages 241-247Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2019.06.040
Keywords
Nuclear structure; Collective rotations; Shape coexistence; Particle rotor model; Projected shell model; Tiltid axis cranking
Funding
- National Natural Science Foundation of China [U1832139, 11505242, 11305220, U1732139, 11775274, 11575255]
- project Cai YuanPei 2018 [41458XH]
- Natural Sciences and Engineering Research Council of Canada
- National Research, Development and Innovation Fund of Hungary [K128947]
- STFC [ST/P005314/1]
- National Research, Development and Innovation Office NKFIH [PD 124717, GINOP-2.3.3-15-2016-00034]
- Polish National Science Centre (NCN) [2013/10/M/ST2/00427]
- National Research Foundation of South Africa [GUN: 93531, 109134]
- Deutsche Forschungsgemeinschaft (DFG)
- National Natural Science Foundation of China (NSFC)
- US-DoE Grant [DE-FG02-95ER4093]
- STFC [ST/P005314/1, ST/L005743/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/P005314/1, ST/L005743/1] Funding Source: researchfish
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Several new bands have been identified in Ba-130, among which there is one with band-head spin 8(+). Its properties are in agreement with the Fermi-aligned nu h(11/2)(2)[523]circle times 9/2(-)[514] Nilsson configuration. This is the first observation of a two-quasiparticle t-band in the A = 130 mass region. The t-band is fed by a dipole band involving two additional h(11/2) protons. The odd-spin partners of the proton and neutron S-bands and the ground-state band at high spins are also newly identified. The observed bands are discussed using several theoretical models, total Routhians surfaces (TRS), tilted axis cranking (TAC), particle rotor model (PRM) and projected shell model (PSM), which strongly suggest the coexistence of prolate and oblate shapes polarized by rotation aligned two-proton and two-neutron configurations, as well as prolate collective rotations around axes with different orientations. With the new results, 130 Ba presents one of the best and most complete sets of collective excitations that a gamma-soft nucleus can manifest at medium and high spins, revealing a diversity of shapes and rotations for the nuclei in the A = 130 mass region. Crown Copyright (C) 2019 Published by Elsevier B.V.
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