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摘要
The decay of Pm-131 has been investigated by means of gamma-ray spectroscopy. The Pm-131 nuclei were produced by fusion-evaporation reaction of Cd-106(S-32,3p4n) at the beam energy of 170 MeV. A helium-jet technique and a tape transport system were used to collect the activities and transfer them to a detecting position for X and gamma rays measurement. Two gamma rays of 185.0 and 220.0 keV were unambiguously identified to follow the beta(+) decay of Pm-131 by results of X-gamma and gamma-gamma coincidence. A growth-decay feature of the decay curve for 87.8 keV gamma-ray of Nd-131 confirmed the production of Pm-131 nuclei. The half-life of Pm-131 was measured to be 6.3+/-0.8 s. A partial decay scheme of Pm-131 is proposed on the basis of X-gamma and gamma - gamma coincidence data in this experiment and the known structure information deduced from in-beam experiments of the daughter nucleus Nd-131.
- 出版日期1999-9
- 单位中国科学院近代物理研究所
