Further Identification of the Decay of 129Pm Near the Proton Drip Line

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XU Shu-Wei, XIE Yuan-Xiang, XU Fu-Rong, LI Zhan-Kui, WANG Xu-Dong and XING Ye-Bing. Further Identification of the Decay of 129Pm Near the Proton Drip Line[J]. Chinese Physics C, 2005, 29(3): 237-239.
XU Shu-Wei, XIE Yuan-Xiang, XU Fu-Rong, LI Zhan-Kui, WANG Xu-Dong and XING Ye-Bing. Further Identification of the Decay of 129Pm Near the Proton Drip Line[J]. Chinese Physics C, 2005, 29(3): 237-239. shu
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Received: 2004-07-09
Revised: 1900-01-01
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Further Identification of the Decay of 129Pm Near the Proton Drip Line

    Corresponding author: XU Shu-Wei,
  • Institute of Modern Physics,CAS,Lanzhou 730000,China2 Department of Technical Physics,Peking University,Beijing 100871,China

Abstract: It was reported in our previous paper in 2004 that the unknown isotope 129Pm near the proton drip line was produced via the fusion-evaporation reaction 40Ca+92Mo, and a 99-keV γ line was assigned to the (EC+b+) decay of 129Pm for the first time.In order to confirm the assignment,following three new evidences were provided in this paper. (1) The excitation function of the 99-keV γ line was made from 164MeV to 190Mev of the incident energy. (2) A cross bombardment 36Ar+96Ru was carried out, from which the same 99-keV γ transition was observed.(3) The nuclear potential-energy-surface (PES) of 129Pm was calculated by using the Woods-Saxon Strutinsky method. The ground spin and parity of 129Pm was then predicted to be 5/2. This prediction leads to a 5/2 low-lying state in the daughter nucleus 129Nd via the (EC+b+) decay of 129Pm favorably.

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