https://doi.org/10.1140/epja/i2006-10252-0
Special Article - Scientific Note
Discovery of a new long-lived isomeric state in 125Ce
1
School of Physics and MOE Key Laboratory of Heavy Ion Physics, Peking University, 100871, Beijing, China
2
Gesellschaft für Schwerionenforschung GSI, 64291, Darmstadt, Germany
3
Justus-Liebig Universität, 35392, Giessen, Germany
4
Department of Physics, University of Surrey, GU2 7XH, Guildford, UK
5
Warsaw University, Hoza 69, 00-681, Warszawa, Poland
* e-mail: B.Sun@gsi.de
Received:
19
December
2006
Accepted:
14
February
2007
Published online:
2
March
2007
A new long-lived isomeric state in the near proton dripline nucleus 125Ce has been identified with Schottky mass spectrometry at GSI. The excitation energy E * = 103(12)keV and the decay time of 193(1)s have been obtained from a single stored fully ionized 125m Ce58+ ion. The data implies an E3 transition and a 1/2+ assignment for the spin of the isomer.
PACS: 21.10.Dr Binding energies and masses – / 21.10.Tg Lifetimes – / 23.20.Lv γ transitions and level energies –
© Società Italiana di Fisica and Springer-Verlag, 2007
