$β$ decay studies of n-rich Cs isotopes with the ISOLDE Decay Station

R. Lică , G. Benzoni , A.I. Morales , M.J.G. Borge , L.M. Fraile , H. Mach , M. Madurga , C. Sotty , V. Vedia , H.De Witte , J. Benito , T. Berry , N. Blasi , A. Bracco , F. Camera , S. Ceruti , V. Charviakova , N. Cieplicka-Oryńczak , C. Costache , F.C.L. Crespi , J. Creswell , G. Fernández-Martínez , H. Fynbo , P. Greenlees , I. Homm , M. Huyse , J. Jolie , V. Karayonchev , U. Köster (1) , J. Konki , T. Kröll , J. Kurcewicz , T. Kurtukian-Nieto (2) , I. Lazarus , S. Leoni , M. Lund , N. Marginean , R. Marginean , C. Mihai , R. Mihai , A. Negret , A. Orduz , Z. Patyk , S. Pascu , V. Pucknell , P. Rahkila , J.M. Regis , F. Rotaru , N. Saed-Sami , V. Sánchez-Tembleque , M. Stanoiu , O. Tengblad , M. Thuerauf , A. Turturica , P.Van Duppen , N. Warr

1 ILL - Institut Laue-Langevin
2 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan

Neutron-rich Ba isotopes are expected to exhibit octupolar correlations, reaching their maximum in isotopes around mass A = 146. The odd-A neutron-rich members of this isotopic chain show typical patterns related to non-axially symmetric shapes, which are however less marked compared to even-A ones, pointing to a major contribution from vibrations. In the present paper we present results from a recent study focused on $^{148 –150}Cs$ β-decay performed at the ISOLDE Decay Station equipped with fast-timing detectors. A detailed analysis of the measured decay half-lives and decay scheme of $^{149}Ba$ is presented, giving a first insight in the structure of this neutron-rich nucleus.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

R. Lică, G. Benzoni, A.I. Morales, M.J.G. Borge, L.M. Fraile, et al.. $β$ decay studies of n-rich Cs isotopes with the ISOLDE Decay Station. J.Phys.G, 2017, 44 (5), pp.054002. ⟨10.1088/1361-6471/aa6015⟩. ⟨hal-01555162⟩