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Title	Fast-timing study of the $l$-forbidden $1/2^+ \rightarrow 3/2^+ M1$ transition in $^{129}Sn$
Author(s)	Lică, R (CERN ; Bucharest, IFIN-HH) ; Mach, H (Warsaw, Inst. Nucl. Studies) ; Fraile, L M (UCM, Madrid, Dept. Phys.) ; Gargano, A (INFN, Naples) ; Borge, M J G (CERN ; Madrid, Inst. Estructura Materia) ; Mărginean, N (Bucharest, IFIN-HH) ; Sotty, C O (Bucharest, IFIN-HH ; Leuven U.) ; Vedia, V (UCM, Madrid, Dept. Phys.) ; Andreyev, A N (York U., England) ; Benzoni, G (INFN, Milan) ; Bomans, P (Leuven U.) ; Borcea, R (Bucharest, IFIN-HH) ; Coraggio, L (INFN, Naples) ; Costache, C (Bucharest, IFIN-HH) ; De Witte, H (Leuven U.) ; Flavigny, F (Leuven U.) ; Fynbo, H (Aarhus U.) ; Gaffney, L P (Leuven U. ; West Scotland U.) ; Greenlees, P T (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Harkness-Brennan, L J (Liverpool U.) ; Huyse, M (Leuven U.) ; Ibáñez, P (UCM, Madrid, Dept. Phys.) ; Judson, D S (Liverpool U.) ; Konki, J (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Korgul, A (Warsaw U.) ; Kröll, T (Darmstadt, Tech. Hochsch.) ; Kurcewicz, J (CERN) ; Lalkovski, S (Surrey U.) ; Lazarus, I (Daresbury) ; Lund, M V (Aarhus U.) ; Madurga, M (CERN) ; Mărginean, R (Bucharest, IFIN-HH) ; Marroquín, I (Madrid, Inst. Estructura Materia) ; Mihai, C (Bucharest, IFIN-HH) ; Mihai, R E (Bucharest, IFIN-HH) ; Morales, A I (INFN, Milan ; U. Valencia (main) ; Milan U.) ; Nácher, E (Madrid, Inst. Estructura Materia) ; Negret, A (Bucharest, IFIN-HH) ; Page, R D (Liverpool U.) ; Pakarinen, J (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Pascu, S (Bucharest, IFIN-HH) ; Paziy, V (UCM, Madrid, Dept. Phys.) ; Perea, A (Madrid, Inst. Estructura Materia) ; Pérez-Liva, M (UCM, Madrid, Dept. Phys.) ; Picado, E (UCM, Madrid, Dept. Phys. ; Heredia U.) ; Pucknell, V (Daresbury) ; Rapisarda, E (CERN) ; Rahkila, P (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Rotaru, F (Bucharest, IFIN-HH) ; Swartz, J A (Leuven U.) ; Tengblad, O (Madrid, Inst. Estructura Materia) ; Van Duppen, P (Leuven U.) ; Vidal, M (UCM, Madrid, Dept. Phys.) ; Wadsworth, R (York U., England) ; Walters, W B (Maryland U., Dept. Chem.) ; Warr, N (Cologne U.)
Publication	2016
Number of pages	7
In:	Phys. Rev. C 93 (2016) 044303
DOI	10.1103/PhysRevC.93.044303
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN ISOLDE
Abstract	The 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 1/2+ state and the 3/2+ ground state in Sn129 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.
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