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Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A = 130 mass region

Petrache, C.M., Walker, P.M., Guo, S., Chen, Q.B., Frauendorf, S., Liu, Y.X., Wyss, R.A., Mengoni, D., Qiang, Y.H., Astier, A. , Dupont, E., Li, R., Lv, B.F., Zheng, K.K., Bazzacco, D., Boso, A., Goasduff, A., Recchia, F., Testov, D., Galtarossa, F., Jaworski, G., Napoli, D.R., Riccetto, S., Siciliano, M., Valiente-Dobon, J.J., Liu, M.L., Zhou, X.H., Wang, J.G., Andreoiu, C., Garcia, F.H., Ortner, K., Whitmore, K., Bäck, T., Cederwall, B., Lawrie, E.A., Kuti, I., Sohler, D., Timár, J., Marchlewski, T., Srebrny, J. and Tucholski, A. (2019) Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A = 130 mass region PHYSICS LETTERS B, 795. pp. 241-247.

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Several new bands have been identified in 130Ba, among which there is one with band-head spin 8+. Its properties are in agreement with the Fermi-aligned νh211/2, 7/2−[523] ⊗9/2−[514]Nilsson configuration. This is the first observation of a two-quasiparticle t-band in the A =130mass region. The t-band is fed by a dipole band involving two additional h11/2protons. 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, 130Ba presents one of the best and most complete sets of collective excitations that a γ-soft nucleus can manifest at medium and high spins, revealing a diversity of shapes and rotations for the nuclei in the A =130mass region.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Petrache, C.M.
Guo, S.
Chen, Q.B.
Frauendorf, S.
Liu, Y.X.
Wyss, R.A.
Mengoni, D.
Qiang, Y.H.
Astier, A.
Dupont, E.
Li, R.
Lv, B.F.
Zheng, K.K.
Bazzacco, D.
Boso, A.
Goasduff, A.
Recchia, F.
Testov, D.
Galtarossa, F.
Jaworski, G.
Napoli, D.R.
Riccetto, S.
Siciliano, M.
Valiente-Dobon, J.J.
Liu, M.L.
Zhou, X.H.
Wang, J.G.
Andreoiu, C.
Garcia, F.H.
Ortner, K.
Whitmore, K.
Bäck, T.
Cederwall, B.
Lawrie, E.A.
Kuti, I.
Sohler, D.
Timár, J.
Marchlewski, T.
Srebrny, J.
Tucholski, A.
Date : 20 June 2019
DOI : 10.1016/j.physletb.2019.06.040
Copyright Disclaimer : Crown Copyright ©2019 Published by Elsevier B.V. This is an open access article under the CC BY license (
Uncontrolled Keywords : Nuclear structure; Collective rotations; Shape coexistence; Particle rotor model; Projected shell model; Tiltid axis cranking
Depositing User : Diane Maxfield
Date Deposited : 12 Aug 2019 13:23
Last Modified : 12 Aug 2019 13:53

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