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Evolution of deformation in neutron-rich Ba isotopes up to A=150.

AuthorsLica, R.; Benzoni, G.; Rodríguez, T. R.; García Borge, María José ; Fraile, Luis M. ; Mach, H.; Morales, A. I.; Madurga, M.; Sotty, C. O.; Vedia, V.; Witte, H. de; Benito, J.; Bernard, R. N.; Berry, T.; Bracco, A.; Camera, F.; Ceruti, S.; Charviakova, V.; Cieplicka, N.; Costache, C.; Crespi, F. C. L.; Creswell, J.; Fernández-Martínez, G.; Fynbo, H.; Greenlees, P.T.; Homm, I.; Huyse, M.; Jolie, J.; Karayonchev, V.; Köster, U.; Konki, J.; Kröll, T.; Kurcewicz, J.; Kurtukian, T.; Lazarus, I; Lund, M. V.; Marginean, N.; Marginean, R.; Mihai, C.; Mihai, R. E.; Negret, A.; Orduz, A.; Patyk, Z.; Pascu, S.; Pucknell, V.; Rahkila, P.; Rapisarda, E.; Regis, J. M.; Robledo, L. M.; Rotaru, F.; Saed-Samii, N.; Sánchez-Tembleque, V.; Stanoiu, M.; Thuerauf, M.; Turturica, A.; Van Duppen, P.; Warr, N.; Tengblad, Olof
Issue Date5-Feb-2018
PublisherAmerican Physical Society
CitationPhysical Review C 97: 024305 (2018)
AbstractThe occurrence of octupolar shapes in the Ba isotopic chain was recently established experimentally up to N = 90. To further extend the systematics, the evolution of shapes in the most neutron-rich members of the Z = 56 isotopic chain accessible at present, Ba-148,Ba-150, has been studied via beta decay at the ISOLDE Decay Station. This paper reports on the first measurement of the positive-and negative-parity low-spin excited states of 150Ba and presents an extension of the beta-decay scheme of Cs-148. Employing the fast timing technique, half-lives for the 2(1)(+) level in both nuclei have been determined, resulting in T-1/2 = 1.51(1) ns for Ba-148 and T-1/2 = 3.4(2) ns for Ba-150. The systematics of low-spin states, together with the experimental determination of the B(E2 : 2(+) -> 0(+)) transition probabilities, indicate an increasing collectivity in Ba148-150, towards prolate deformed shapes. The experimental data are compared to symmetry conserving configuration mixing (SCCM) calculations, confirming an evolution of increasingly quadrupole deformed shapes with a definite octupolar character.
Description12 pags., 11 figs., 3 tabs. -- Open Access funded by Creative Commons Atribution Licence 4.0
Publisher version (URL)https://doi.org/10.1103/PhysRevC.97.024305
Identifiersdoi: 10.1103/PhysRevC.97.024305
issn: 2469-9985
Appears in Collections:(CFMAC-IEM) Artículos
(IFIC) Artículos
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