Decay of the very neutron-deficient isotope 131Pm |
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Authors: | ZG Gan Z Qin JS Guo LJ Shi HY Liu TR Guo XG Lei RC Ma WX Huang SG Yuan XQ Zhang GM Jin |
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Institution: | (1) Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, P.R. China, CN |
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Abstract: | The decay of 131Pm has been investigated by means of γ-ray spectroscopy. The 131Pm nuclei were produced by fusion-evaporation reaction of 106Cd(32S,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 γ rays measurement. Two γ rays of 185.0 and 220.0 keV were unambiguously
identified to follow the β+ decay of 131Pm by results of X-γ and γ–γ coincidence. A growth-decay feature of the decay curve for 87.8 keV γ-ray of 131Nd confirmed the production of 131Pm nuclei. The half-life of 131Pm was measured to be 6.3 ± 0.8 s. A partial decay scheme of 131Pm is proposed on the basis of X-γ and γ–γ coincidence data in this experiment and the known structure information deduced
from in-beam experiments of the daughter nucleus 131Nd.
Received: 11 January 1999 / Revised version: 20 May 1999 |
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Keywords: | PACS: 27 60 +j 90 < A < 149 – 21 10 Tg Lifetimes – 29 30 Kv X- and γ -ray spectroscopy |
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