Abstract:
A recoil distance method was used to measure half-lives of the excited states of 145Sm. The reaction used was 139La(10B, 4n)145Sm. A plunger system was used. Half-lives were determined for two excited states for the first time. The yrast 27/2+ state was found to have a half-life of 1.1 ± 0.2 ns corresponding to the retardation of 3.1 × 10−4 comparing with the single particle estimate of M1. The excitation energy of this state was well reproduced by the shell model calculation having a mixed configuration of [π{h11/2(g7/2)−2 (d5/2)−1}10−, νf7/2] + [π{h11/2(g7/2)−1}9−,νh9/2]. Another retarded E1 transition was also found in a decay of a 21/2+ state. Its retardation was 1.6 × 10−4 comparing with the single particle value.
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Received: 9 September 1997 / Revised version: 12 June 1998
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El-Badry, A., Kuroyanagi, T., Mitarai, S. et al. Recoil distance half-life measurements of the excited states in 145Sm. EPJ A 3, 133–138 (1998). https://doi.org/10.1007/s100500050159
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DOI: https://doi.org/10.1007/s100500050159