First Study of Weak (EC+β<SUP>+</SUP>) Decay Branch for the Neutron-Deficient Isotoep <SUP>209</SUP>Fr

Xie Yuanxiang; Xu Shuwei; Guo Yingxiang; Ma Ruichang; Ge Yuanxiu; Li Zhankui; Wang Chunfang; Guo Bin; Xing Jianping; Zhang Tianmei; Zhu Shaofei; Xu Wang

Chinese Physics C> 1997, Vol. 21> Issue(4) : 289-291

First Study of Weak (EC+β⁺) Decay Branch for the Neutron-Deficient Isotoep ²⁰⁹Fr

Institute of Modern Physics,The Chinese Acadeny of Sciences,Lanzhou 730000

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Abstract：
²⁰⁹Fr has been produced by irradiation of ¹⁹⁷Au with ¹⁶O from SFC accelarator uia the fusion-evaporation 4n channel.The(EC+β⁺)decay of ²⁰⁹Fr has been studied by a He-jet tape transport system.The decay scheme is proposed for the first time based on γ-t,X-γ-t,γ-γ-t coincidece and γ-γ delay coincidence measurements,which takes account of 20 observed γ ray.Five members of low-lying states in ²⁰⁹Rn can be explained by the multi-plet [(²¹⁰Rn2⁺)(νf_5/2)^－1].The branching ratio for(EC+β⁺) decay of ²⁰⁹Fr has been estimated experimentaly to be(3.0±1.5)%.

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Xie Yuanxiang, Xu Shuwei, Guo Yingxiang, Ma Ruichang, Ge Yuanxiu, Li Zhankui, Wang Chunfang, Guo Bin, Xing Jianping, Zhang Tianmei, Zhu Shaofei and Xu Wang. First Study of Weak (EC+β⁺) Decay Branch for the Neutron-Deficient Isotoep ²⁰⁹Fr[J]. Chinese Physics C, 1997, 21(4): 289-291.

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Received: 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

First Study of Weak (EC+β⁺) Decay Branch for the Neutron-Deficient Isotoep ²⁰⁹Fr

Corresponding author: Xie Yuanxiang,

Institute of Modern Physics,The Chinese Acadeny of Sciences,Lanzhou 730000

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 1997-04-05

Abstract: ²⁰⁹Fr has been produced by irradiation of ¹⁹⁷Au with ¹⁶O from SFC accelarator uia the fusion-evaporation 4n channel.The(EC+β⁺)decay of ²⁰⁹Fr has been studied by a He-jet tape transport system.The decay scheme is proposed for the first time based on γ-t,X-γ-t,γ-γ-t coincidece and γ-γ delay coincidence measurements,which takes account of 20 observed γ ray.Five members of low-lying states in ²⁰⁹Rn can be explained by the multi-plet [(²¹⁰Rn2⁺)(νf_5/2)^－1].The branching ratio for(EC+β⁺) decay of ²⁰⁹Fr has been estimated experimentaly to be(3.0±1.5)%.

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First Study of Weak (EC+β⁺) Decay Branch for the Neutron-Deficient Isotoep ²⁰⁹Fr

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First Study of Weak (EC+β⁺) Decay Branch for the Neutron-Deficient Isotoep ²⁰⁹Fr

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First Study of Weak (EC+β+) Decay Branch for the Neutron-Deficient Isotoep 209Fr

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First Study of Weak (EC+β+) Decay Branch for the Neutron-Deficient Isotoep 209Fr

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First Study of Weak (EC+β⁺) Decay Branch for the Neutron-Deficient Isotoep ²⁰⁹Fr

First Study of Weak (EC+β⁺) Decay Branch for the Neutron-Deficient Isotoep ²⁰⁹Fr