Acta Physica Polonica B

Vol. 39, No. 2, February 2008, page 489

Observation of a New (25/2+) Isomer in 121Sb

J. Kownacki, M. Kisielinski, M. Kowalczyk, Ch. Droste, T. Morek, E. Ruchowska, J. Srebrny, M. Wolinska-Cichocka, M. Palacz, A. Korman, J. Andrzejewski, A. Król, J. Perkowski, R. Lieder, J. Mierzejewski, I. Sankowska

The beam pulse structure of the HIL cyclotron and thick target \gamma --\gamma coincidence measurements in the in-beam and off-beam modes have been used to search for isomers in the A \approx 120 mass region using heavy-ion reactions. The half-life of the 2721 keV, (25/2+) level in 121Sb was determined in the off-beam mode to be 167 \pm 19 \mu s. Two deexcitation sequences of this isomer are proposed. The isomeric state is considered to be of 3-quasiparticle nature \pi (d5/2)\nu (h11/22)10+.

PACS numbers: 27.60.+j


 
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