Chinese Physics C > 2001, Vol. 25 > Issue(3): 198-204

(EC/β⁺) Decay of Neutron Deficient Nuclide¹²⁹Ce

Institute of Modern Physics, The Chinese Academy of Science, Lanzhou 730000, China

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Abstract：
The nuclide ¹²⁹Ce was produced by a ( ¹⁶O,4n) reaction with an enriched ¹¹⁷Sn target. With the aid of a helium-jet tape transport system, the reaction products were transported to a shielded location,where Ce samples were prepared after chemical separation. The neighboring isotopes of ¹¹⁷Sn, ¹¹⁶Sn and ¹¹⁸Sn,were also bombarded with ¹⁶O beam. Different isotopes of Ce were further separated by comparing the products in the above three reactions. An activity with a half life of 4.1 min in the chemically purified cerium samples was identified as ¹²⁹Ce. Based on X-γ-t and γ-γ-t coincidence measurements, the EC/β ⁺decay scheme of ¹²⁹Ce, including 51 γ lines,was proposed. Using the observed growth decay curve of an intense 278.6keV γ line of ¹²⁹La decay, the β feeding branch from the ground state of ¹²⁹Ce directly to the ground state of ¹²⁹La was estimated to be (26±7)%. In addition, the γ spectra gated by both La-K _α-X ray and intense 68.2keV γ ray of ¹²⁹Ce decay as well as the time spectra of typical γ rays were also presented here.

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XIE Yuan-Xiang, XU Shu-Wei, LI Zhan-Kui, ZHANG Tian-Mei, MA Rui-Chang, GUO Ying-Xiang, GE Yuan-Xiu, WANG Chun-Fang and XING Jian-Ping. (EC/β ⁺) Decay of Neutron Deficient Nuclide ¹²⁹Ce[J]. Chinese Physics C, 2001, 25(3): 198-204.

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Received: 2000-02-24
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 of Neutron Deficient Nuclide¹²⁹Ce

Corresponding author:XIE Yuan-Xiang,

Institute of Modern Physics, The Chinese Academy of Science, Lanzhou 730000, China

Received Date:2000-02-24
Accepted Date:1900-01-01
Available Online:2001-03-05

Abstract:The nuclide¹²⁹Ce was produced by a (¹⁶O,4n) reaction with an enriched¹¹⁷Sn target. With the aid of a helium-jet tape transport system, the reaction products were transported to a shielded location,where Ce samples were prepared after chemical separation. The neighboring isotopes of¹¹⁷Sn,¹¹⁶Sn and¹¹⁸Sn,were also bombarded with¹⁶O beam. Different isotopes of Ce were further separated by comparing the products in the above three reactions. An activity with a half life of 4.1 min in the chemically purified cerium samples was identified as¹²⁹Ce. Based on X-γ-t and γ-γ-t coincidence measurements, the EC/β⁺decay scheme of¹²⁹Ce, including 51 γ lines,was proposed. Using the observed growth decay curve of an intense 278.6keV γ line of¹²⁹La decay, the β feeding branch from the ground state of¹²⁹Ce directly to the ground state of¹²⁹La was estimated to be (26±7)%. In addition, the γ spectra gated by both La-K_α-X ray and intense 68.2keV γ ray of¹²⁹Ce decay as well as the time spectra of typical γ rays were also presented here.