Abstract
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 148–150Cs 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 149Ba is presented, giving a first insight in the structure of this neutron-rich nucleus.
Highlights
The region of n-rich Ba nuclei is known to exhibit strong octupole correlations, which have been postulated more than 30 years ago by Nazarewicz et al [1]
Spins and parities of both yrast and side bands could be assigned in most cases through directional correlations from oriented states (DCO) and polarization measurements [4, 5]. β decay studies of the Cs parent nuclei have been performed, highlighting the population of non-yrast low-spin states [6]
Located at the crossing between the axially deformed N = 93 isotones and the octupolar odd-A Z = 56 isotopes, the analysis of low-lying structures in 149Ba can provide useful information for a first insight in this nucleus. In this contribution we describe a β decay experiment performed using the ISOLDE Decay Station (IDS) set-up to study the most exotic members of the isotopic chain of Ba accessible up to date
Summary
The region of n-rich Ba nuclei is known to exhibit strong octupole correlations, which have been postulated more than 30 years ago by Nazarewicz et al [1]. Located at the crossing between the axially deformed N = 93 isotones and the octupolar odd-A Z = 56 isotopes, the analysis of low-lying structures in 149Ba can provide useful information for a first insight in this nucleus. In this contribution we describe a β decay experiment performed using the ISOLDE Decay Station (IDS) set-up to study the most exotic members of the isotopic chain of Ba accessible up to date. A comparison of decay half-lives to most recent calculations is presented
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