Further Identification of the Decay of <SUP>129</SUP>Pm Near the Proton Drip Line

XU Shu-Wei; XIE Yuan-Xiang; XU Fu-Rong; LI Zhan-Kui; WANG Xu-Dong; XING Ye-Bing

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

Further Identification of the Decay of ¹²⁹Pm 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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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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[1]

. 　XU S W, XIE Y X, LI Z K et al . High Energy Phys. and Nucl .Phys. , 2004 , 28 : 158 —160 (in Chinese)(徐树威,谢元祥,李占奎等,高能物理与核物理,2004 , 28 (2) :158 —160)2.　Zeidan O , Hartley D J , Riedinger L L et al . Phys. Rev. , 2002 , C65 :0243033.　XIE YX, XU SW, LI Z Ket al . Eur. Phys. J . , 1999 , A5 :341 —3454.　Nazarewicz W, Dudek J , Bengtsson R et al . Nucl . Phys. ,1985 , A435 :397 —4305.　Mê ller P , Nix J R , Kratz KL. At . Data Nucl . Data Tables , 1997 , 66 :131 —343

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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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沈阳化工大学材料科学与工程学院沈阳 110142

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

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 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.