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Diversity of shapes and rotations in the gamma-soft Ba-130 nucleus: First observation of a t-band in the A=130 mass region
Univ Paris Saclay, CNRS, IN2P3, Ctr Sci Nucl & Sci Mat, Bat 104-108, F-91405 Orsay, France..
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0003-1771-2656
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2019 (English)In: PHYSICS LETTERS B, Vol. 795, p. 241-247Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
ELSEVIER , 2019. Vol. 795, p. 241-247
Keywords [en]
Nuclear structure, Collective rotations, Shape coexistence, Particle rotor model, Projected shell model, Tiltid axis cranking
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-256247DOI: 10.1016/j.physletb.2019.06.040ISI: 000477924000034Scopus ID: 2-s2.0-85067816517OAI: oai:DiVA.org:kth-256247DiVA, id: diva2:1364227
Note

QC 20191022

Available from: 2019-10-22 Created: 2019-10-22 Last updated: 2019-10-22Bibliographically approved

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Wyss, Ramon AlexanderBack, ToveCederwall, Bo

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