Chinese Physics C > 2002, Vol. 26 > Issue(8): 797-802

(EC+β⁺) Decay of¹³³Sm and 1.1s Isomer of¹³³Pr

Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China

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Abstract：
By irradiation of an enriched target of ⁹⁶Ru with ⁴⁰Ca and using a helium-jet fast tape transport system in combination with X-γ and γ-γ coincidence measurements,the very neutron deficient isotope ¹³³Sm was produced and studied. A simple(EC+β ⁺) decay scheme of Sm is proposed for the first time. A by product ¹³³Pr was produced simultaneously because of the ^98－102Ru contents of the ruthenium target. The half-life of an 11/2 ^－low-lying isomeric state in ¹³³Pr has been measured to be (1.1±0.2)s. Using single-particle model,the reduced transition probabilities of the 11/2 ^－isomers in ^{131,133,135,137}Pr are extracted from their experimental half-lives and compared with the Weisskopf estimate.

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WANG Xu-Dong, XIE Yuan-Xiang, XU Shu-Wei, LI Zhan-Kui, GUO Bin, LENG Chang-Geng, WANG Chun-Fang and YU Yong. (EC+β ⁺) Decay of ¹³³Sm and 1.1s Isomer of ¹³³Pr[J]. Chinese Physics C, 2002, 26(8): 797-802.

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Received: 2001-10-26
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

(EC+β⁺) Decay of¹³³Sm and 1.1s Isomer of¹³³Pr

Corresponding author:WANG Xu-Dong,

Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China

Received Date:2001-10-26
Accepted Date:1900-01-01
Available Online:2002-08-05

Abstract:By irradiation of an enriched target of⁹⁶Ru with⁴⁰Ca and using a helium-jet fast tape transport system in combination with X-γ and γ-γ coincidence measurements,the very neutron deficient isotope¹³³Sm was produced and studied. A simple(EC+β⁺) decay scheme of Sm is proposed for the first time. A by product ¹³³Pr was produced simultaneously because of the ^98－102Ru contents of the ruthenium target. The half-life of an 11/2 ^－low-lying isomeric state in ¹³³Pr has been measured to be (1.1±0.2)s. Using single-particle model,the reduced transition probabilities of the 11/2 ^－isomers in ^{131,133,135,137}Pr are extracted from their experimental half-lives and compared with the Weisskopf estimate.