TY  - JOUR
AU  - IDS Collaboration (Lica, R. et al
AU  - Morales, A. I.
PY  - 2016
DA  - 2016//
TI  - Fast-timing study of the l-forbidden 1/2(+) -> 3/2(+) M1 transition in Sn-129
T2  - Phys. Rev. C
JO  - Physical Review C
SP  - 044303
EP  - 7pp
VL  - 93
IS  - 4
PB  - Amer Physical Soc
AB  - The levels in Sn-129 populated from the beta(-) decay of In-129 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 s(1/2) (l = 0) and d(3/2) (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 havemeasured the half-life of the 1/2(+) 315.3-keV state, T-1/2 = 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 T-1/2 value by the renormalization of the M1 effective operator for neutron holes.
SN  - 2469-9985
UR  - https://doi.org/10.1103/PhysRevC.93.044303
DO  - 10.1103/PhysRevC.93.044303
LA  - English
N1  - WOS:000373574200003
ID  - IDSCollaborationLica+Morales2016
ER  -