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Fast-timing study of the l-forbidden 1/2+→3/2+ M1 transition in Sn129

AutorLică, R.; Mach, H.; Fraile, Luis M. ; García Borge, María José ; Marroquín, I. ; Morales, A. I.; Nácher, Enrique ; Perea, Ángel ; Rotaru, F.; Tengblad, Olof ; Vidal, M.
Fecha de publicación4-abr-2016
EditorAmerican Physical Society
CitaciónPhysical Review C - Nuclear Physics 93: 044303 (2016)
ResumenThe levels in Sn129 populated from the β- decay of In129 isomers were investigated at the ISOLDE facility of CERN using the newly commissioned ISOLDE Decay Station (IDS). The lowest 12+ state and the 32+ ground state in Sn129 are expected to have configurations dominated by the neutron s12 (l=0) and d32 (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 12+ 315.3-keV state, T12= 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 T12 value by the renormalization of the M1 effective operator for neutron holes.
DescripciónR. Lică et al. ; 7 págs.; 5 figs.; 3 tabs. ; Open Access funded by Creative Commons Atribution Licence 3.0
Versión del editorhttps://doi.org/10.1103/PhysRevC.93.044303
Identificadoresdoi: 10.1103PhysRevC/93.044303
issn: 1089-490X
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