Speaker
Razvan Lica
(IFIN-HH Bucharest (RO))
Description
We have investigated levels in $^{129}$Sn populated from the $\beta^-$ decay of $^{129}$In isomers at the ISOLDE facility.
The $^{129}$Sn nucleus is a three-neutron hole system next to the doubly magic $^{132}$Sn.
The involved states of spin $1/2^+$ and $3/2^+$ are expected to have a configuration determined by the neutron $s_{1/2}$ and $d_{3/2}$ single particle states, respectively. Consequently, these states should be connected by a rather slow $l$-forbidden M1 transition.
Using the fast timing technique we have measured the lifetime of the $1/2^+$ 315.3-keV level and determined the transition rate for the 315.3-keV $\gamma$-ray feeding the $3/2^+$ ground state.
Our measurement shows a moderately fast M1 transition with a very weak,
if any, E2 component.
The previously reported level schemes in $^{129}$Sn were mostly confirmed by the $\gamma - \gamma$ coincidences. This study represents the first test of the ISOLDE Decay Station (IDS).
Authors
Angela Gargano
(INFN)
Henryk Mach
(National Centre for Nuclear Research)
Razvan Lica
(IFIN-HH Bucharest (RO))
Co-authors
Christophe Sotty
(Katholieke Universiteit Leuven (BE))
Elisa Rapisarda
(CERN)
Giovanna Benzoni
(INFN sezione di Milano)
Hilde De Witte
(Katholieke Universiteit Leuven (BE))
Jan Pawel Kurcewicz
(CERN)
Joonas Konki
(JYFL)
Luis M Fraile
(Universidad Complutense (ES))
Maria Jose Garcia Borge
(CERN)
Mark L Huyse
(KU Leuven (BE))
Miguel Madurga Flores
(CERN)
Morten Vinther Lund
(Aarhus University (DK))
Nicolae Marginean
(IFIN-HH)
Nigel Warr
(IKP Uni. Koeln)
Panu Rahkila
(JYFL)
Piet Van Duppen
(Katholieke Universiteit Leuven (BE))
Victoria Vedia
(Universidad Complutense de Madrid (UCM))
