Chinese Physics C > 2005, Vol. 29 > Issue(3): 237-239

Further Identification of the Decay of¹²⁹Pm Near the Proton Drip Line

Institute of Modern Physics,CAS,Lanzhou 730000,China2 Department of Technical Physics,Peking University,Beijing 100871,China

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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.

References

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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.

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Received: 2004-07-09
Revised: 1900-01-01

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Further Identification of the Decay of¹²⁹Pm 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

Received Date:2004-07-09

Accepted Date:1900-01-01

Available Online:2005-03-05

Abstract:It was reported in our previous paper in 2004 that the unknown isotope¹²⁹Pm 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 of¹²⁹Pm 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 bombardment³⁶Ar+⁹⁶Ru was carried out, from which the same 99-keV γ transition was observed.(3) The nuclear potential-energy-surface (PES) of¹²⁹Pm was calculated by using the Woods-Saxon Strutinsky method. The ground spin and parity of¹²⁹Pm was then predicted to be 5/2^－. This prediction leads to a 5/2^－low-lying state in the daughter nucleus¹²⁹Nd via the (EC+b+) decay of¹²⁹Pm favorably.

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Further Identification of the Decay of¹²⁹Pm Near the Proton Drip Line

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通讯作者:陈斌, bchen63@163.com

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