Article,

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

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Phys. Rev. C, 108 (6): 064301 (December 2023)
DOI: 10.1103/PhysRevC.108.064301

Abstract

Lifetime measurements of the 3-, 4-, and 6- intraband states in the neutron-rich, odd-odd 96Rb nucleus were performed at the LOHENGRIN spectrometer of Institut Laue-Langevin, using thermal-neutron-induced fission of 235U 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 96Rb. 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 98Y isotone are discussed.

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