Fast-timing study of the l-forbidden 1/2+ → 3/2+ M1 transition in 129Sn



IDS Collaboration, , Lică, R, Mach, H, Fraile, LM, Gargano, A, Borge, MJG, Mărginean, N, Sotty, CO, Vedia, V, Andreyev, AN
et al (show 47 more authors) (2016) Fast-timing study of the l-forbidden 1/2+ → 3/2+ M1 transition in 129Sn. Physical Review C, 93 (04).

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Abstract

The levels in 129Sn populated from the β− decay of 129In isomers were investigated at the ISOLDE facility of CERN using the newly commissioned ISOLDE Decay Station (IDS). The lowest 1/2+ state and the 3/2+ ground state in 129Sn are expected to have configurations dominated by the neutron s1/2 (l=0) and d3/2 (l=2) single-particle states, respectively. Consequently, these states should be connected by a somewhat slow l-forbidden M1 transition. Using fast-timing spectroscopy we have measured the half-life of the 1/2+ 315.3-keV state, T1/2= 19(10) ps, which corresponds to a moderately fast M1 transition. Shell-model calculations using the CD-Bonn effective interaction, with standard effective charges and g factors, predict a 4-ns half-life for this level. We can reconcile the shell-model calculations to the measured T1/2 value by the renormalization of the M1 effective operator for neutron holes.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 12 Apr 2016 13:33
Last Modified: 14 Oct 2021 22:10
DOI: 10.1103/PhysRevC.93.044303
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3000236