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Lifetime measurements in Rb 96 via fast-timing techniques: Investigating shape coexistence at A≃100

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Title
Lifetime measurements in Rb 96 via fast-timing techniques: Investigating shape coexistence at A≃100
Author(s)
Gamba, E.R.; Bottoni, S.; Iskra, L.W.; Zavaglia, C.; Leoni, S.; Fornal, B.; Cieplicka-Orynczak, N.; Benzoni, G.; Colombi, G.; Crespi, F.C.L.; Esmaylzadeh, A.; Jentschel, M.; Jolie, J.; Karayonchev, V.; Yung Hee Kim; Knafla, L.; Koster, U.; Ley, M.; Marginean, N.; Marginean, R.; Michelagnoli, C.; Polettini, M.; Porzio, C.; Regis, J.-M.; Reygadas, D.; Turturica, A.
Publication Date
2023-12
Journal
Physical Review C, v.108, no.6
Publisher
American Physical Society
Abstract
Lifetime measurements of the (3-), (4-), and (6-) intraband states in the neutron-rich, odd-odd Rb96 nucleus were performed at the LOHENGRIN spectrometer of Institut Laue-Langevin, using thermal-neutron-induced fission of U235 and fast-timing techniques with LaBr3:Ce scintillator detectors. The nanosecond isomeric nature of the (3-) bandhead was established as well as the β2=0.39(3) deformation parameter of the band, pointing to a robust deformation in Rb96. Moreover, a hindered B(E2) value of 3.9-13+19×10-2 W.u. was found for the γ decay of the deformed (4-) state to the spherical 2- ground state. A retardation was also found for the (3-) → 2- transition, possibly due to the shape change and giving strong support to a shape coexistence scenario in this nucleus, at the borders of the island of deformation at N=60. Analogies with the structure of the Y98 isotone are discussed. © 2023 American Physical Society.
URI
https://pr.ibs.re.kr/handle/8788114/14544
DOI
10.1103/PhysRevC.108.064301
ISSN
2469-9985
Appears in Collections:
Center for Exotic Nuclear Studies(희귀 핵 연구단) > 1. Journal Papers (저널논문)
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