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Recoil distance half-life measurements of the excited states in 145Sm

  • A.M. El-Badry
  • T. Kuroyanagi
  • S. Mitarai
  • A. Odahara
  • Y. Gono
  • S. Morinobu
  • K. Ogawa
Nuclear structure

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.

PACS:21.10.-k Properties of nuclei; nuclear energy levels – 27.60.+j 90 ≤ A ≤ 149 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • A.M. El-Badry
    • 1
  • T. Kuroyanagi
    • 1
  • S. Mitarai
    • 1
  • A. Odahara
    • 1
  • Y. Gono
    • 1
  • S. Morinobu
    • 1
  • K. Ogawa
    • 2
  1. 1.Department of Physics,Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, JapanJP
  2. 2.Department of physics, Chiba University, Chiba 263, JapanJP

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