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

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Lica , R , Mach , H , Fraile , L M , Gargano , A , Borge , M J G , Marginean , N , Sotty , C O , Vedia , V , Andreyev , A N , Benzoni , G , Bomans , P , Borcea , R , Coraggio , L , Costache , C , De Witte , H , Flavigny , F , Fynbo , H , Gaffney , L P , Greenlees , P T , Harkness-Brennan , L J , Huyse , M , Ibanez , P , Judson , D S , Konki , J , Korgul , A , Kroell , T , Kurcewicz , J , Lalkovski , S , Lazarus , I , Lund , M V , Madurga , M , Marginean , R , Marroquin , I , Mihai , C , Mihai , R E , Morales , A I , Nacher , E , Negret , A , Page , R D , Pakarinen , J , Pascu , S , Paziy , V , Perea , A , Perez-Liva , M , Picado , E , Pucknell , V , Rapisarda , E , Rahkila , P , Rotaru , F , Swartz , J A & IDS Collaboration 2016 , ' Fast-timing study of the l-forbidden 1/2(+) - > 3/2(+) M1 transition in Sn-129 ' Physical Review C , vol. 93 , no. 4 , 044303 . DOI: 10.1103/PhysRevC.93.044303

Title: Fast-timing study of the l-forbidden 1/2(+) -> 3/2(+) M1 transition in Sn-129
Author: Lica, R.; Mach, H.; Fraile, L. M.; Gargano, A.; Borge, M. J. G.; Marginean, N.; Sotty, C. O.; Vedia, V.; Andreyev, A. N.; Benzoni, G.; Bomans, P.; Borcea, R.; Coraggio, L.; Costache, C.; De Witte, H.; Flavigny, F.; Fynbo, H.; Gaffney, L. P.; Greenlees, P. T.; Harkness-Brennan, L. J.; Huyse, M.; Ibanez, P.; Judson, D. S.; Konki, J.; Korgul, A.; Kroell, T.; Kurcewicz, J.; Lalkovski, S.; Lazarus, I.; Lund, M. V.; Madurga, M.; Marginean, R.; Marroquin, I.; Mihai, C.; Mihai, R. E.; Morales, A. I.; Nacher, E.; Negret, A.; Page, R. D.; Pakarinen, J.; Pascu, S.; Paziy, V.; Perea, A.; Perez-Liva, M.; Picado, E.; Pucknell, V.; Rapisarda, E.; Rahkila, P.; Rotaru, F.; Swartz, J. A.; IDS Collaboration
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
Date: 2016-04-04
Language: eng
Number of pages: 7
Belongs to series: Physical Review C
ISSN: 2469-9985
URI: http://hdl.handle.net/10138/164553
Abstract: 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.
Subject: PICOSECOND LIFETIME MEASUREMENTS
NEUTRON-RICH NUCLEI
114 Physical sciences
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