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

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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) , Benzoni, G, Bomans, P, Borcea, R, Coraggio, L, Costache, C, De Witte, H, Flavigny, F, Fynbo, H, Gaffney, LP, Greenlee, PT, Harkness-Brennan1, LJ, Huyse, M, Ibáñez, P, Judson, DS, Konki, J, Korgul, A, Kröl, T, Kurcewicz, J, Lalkovski, S, Lazarus, I, Lund, MV, Madurga, M, Mărginean, R, Marroquín, I, Mihai, C, Mihai, RE, Morales, AI, Nácher, E, Negret, A, Page, RD, Pakarinen, J, Pascu, S, Paziy, V, Perea, A, Pérez-Liva, M, Picado, E, Pucknell, V, Rapisarda, E, Rahkila, P, Rotaru, F, Swartz, JA, Tengblad, O, Van Duppen, P, Vidal, M, Wadsworth, R, Walters, WB and Warr, N (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
Uncontrolled Keywords:	5106 Nuclear and Plasma Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	12 Apr 2016 13:33
Last Modified:	21 Jun 2024 00:00
DOI:	10.1103/PhysRevC.93.044303
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3000236