Lifetime measurements in the chiral-candidate doublet bands of La-130
PHYSICAL REVIEW C, vol.98, no.5, 2018 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 98 Issue: 5
- Publication Date: 2018
- Doi Number: 10.1103/physrevc.98.054305
- Journal Name: PHYSICAL REVIEW C
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Ankara University Affiliated: No
Abstract
The lifetimes of the excited states belonging to the chiral-candidate doublet bands built on the pi h(11/2) circle times vh(11/12)(-1) configuration in La-130 have been measured by applying the Doppler-shift attenuation method and the in-beam fast timing technique. Excited states were populated in the Sb-121(C-12, 3n) reaction at a bombarding energy of 54 MeV. The 7(+) bandhead of the yrast band was identified as an isomeric state with a lifetime of tau(7(+)) = 0.38(7) ns Similar reduced transition probabilities B(M1) and B(E2) were found for the states with the same spin in the partner bands. The results revealed an even-odd spin dependence in the B(E2) values, whereas the B (M1) values vary nearly monotonically with increasing spin. The experimental properties of the doublet bands in La-130 are compared with theoretical calculations done in the frame of the two-quasiparticles-plus-triaxial-rotor model. The static chirality is not supported by the obtained data; however, chiral vibrations cannot be excluded.