Preliminary results of lifetime measurements in neutron-rich 53Ti

A Goldkuhle ,Hongjie Li,D Ralet ,M Beckers ,A Blazhev ,J Litzinger ,B Jacquot ,G De France ,A Lemasson ,H Hess ,K O Zell ,J Eberth ,A Navin ,C Müller-Gatermann ,Α Dewald ,M Rejmund ,B Birkenbach ,B S Nara Singh ,J Ljungvall ,R M Pérez-Vidal ,S M Lenzi ,D R Napoli ,C Michelagnoli ,J Dudouet ,Yung-Hee Kim,C Fransen ,P Reiter ,N Warr ,E Clément ,T Braunroth ,A Vogt ,M Zielińska

doi:10.1051/epjconf/201922301022

Abstract

To study the nuclear structure of neutron-rich titanium isotopes, a lifetime measurement was performed at the Grand Accélérateur National d'Ions Lourds (GANIL) facility in Caen, France. The nucleiwere produced in a multinucleon-transfer reaction by using a 6.76 MeV/u 238U beam. The Advanced Gamma Tracking Array (AGATA) was employed for the γ-ray detection and target-like recoils were identified event-by-event by the large-acceptance variable mode spectrometer (VAMOS++). Preliminary level lifetimes of the (5/2−) to 13/2− states of the yrast band in the neutron-rich nucleus 53Ti were measured for the first time employing the recoil distance Doppler-shift (RDDS) method and the compact plunger for deep inelastic reactions. The differential decay curve method (DDCM) was used to obtain the lifetimes from the RDDS data.

Highlights

The Advanced Gamma Tracking Array (AGATA) was employed for the γ-ray detection and target-like recoils were identified event-by-event by the large-acceptance variable mode spectrometer (VAMOS++)
Preliminary level lifetimes of the (5/2−) to 13/2− states of the yrast band in the neutron-rich nucleus 53Ti were measured for the first time employing the recoil distance Doppler-shift (RDDS) method and the compact plunger for deep inelastic reactions
The nuclear structure in the region of neutron-rich Ti isotopes is of enhanced interest due to the observed features hinting at subshell closures at N = 32, 34 [1]

Summary

Introduction

The nuclear structure in the region of neutron-rich Ti isotopes is of enhanced interest due to the observed features hinting at subshell closures at N = 32, 34 [1]. In neutron-rich 50−56Ti isotopes the staggering of the excitation energies for the 2+1 state points to emergence of subshells. The knowledge was extended by studies performed at the Gammasphere spectrometer [3] to identify the 53Ti yrast cascade for the first time and to determine the excitation energy of states with spins up to Iπ = 21/2−. The experimental yrast structure was compared with shellmodel calculations where the experimental data are well described by calculations using the GXPF1 and GXPF1A interactions [3].

Experimental Details

Data analysis and results

Summary