β-Delayed Proton Decays of <SUP>133</SUP>Sm and <SUP>149</SUP>Yb

XU Shu-Wei; XIE Yuan-Xiang; LI Zhan-Kui; XU Fu-Rong; LIU Hong-Liang

Chinese Physics C> 2006, Vol. 30> Issue(11) : 1067-1070

β-Delayed Proton Decays of ¹³³Sm and ¹⁴⁹Yb

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 Department of Technical Physics, Peking University, Beijing 100871, China

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Abstract：
¹³³Sm was produced via fusion evaporation in the reaction ⁴⁰Ca+⁹⁶Ru. Its β-delayed proton decay was studied by means of “p-γ” coincidence in combination with a He-jet tape transport system, including half-lives, proton energy spectra, γ-transitions following the proton emissions, and the branching ratios to the low-lying states in the grand-daughter nuclei. The possible spins and parities of ¹³³Sm were extracted by fitting the experimental data with a statistical model calculation. The configuration-constrained nuclear potential energy surfaces of ¹³³Sm were calculated by using the Woods-Saxon Strutinsky method. Comparing the experimental and calculated results, the spins and parities of ¹³³Sm were assigned to be 5/2⁺ and 1/2^－, which is reconciled with our published simple (EC+β⁺) decay scheme of ¹³³Sm in 2001. In addition, our experimental data on the beta-delayed proton decay of ¹⁴⁹Yb reported in Eur. Phys. J., 2001, A12: 1—4 was also analyzed by using the same method. The spin and parity of ¹⁴⁹Yb was assigned to be 1/2^－.

References

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XU Shu-Wei, XIE Yuan-Xiang, LI Zhan-Kui, XU Fu-Rong and LIU Hong-Liang. β-Delayed Proton Decays of ¹³³Sm and ¹⁴⁹Yb[J]. Chinese Physics C, 2006, 30(11): 1067-1070.

XU Shu-Wei, XIE Yuan-Xiang, LI Zhan-Kui, XU Fu-Rong and LIU Hong-Liang. β-Delayed Proton Decays of ¹³³Sm and ¹⁴⁹Yb[J]. Chinese Physics C, 2006, 30(11): 1067-1070. shu

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Received: 2006-01-24
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

β-Delayed Proton Decays of ¹³³Sm and ¹⁴⁹Yb

Corresponding author: XU Shu-Wei,

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 Department of Technical Physics, Peking University, Beijing 100871, China

Received Date: 2006-01-24

Accepted Date: 1900-01-01

Available Online: 2006-11-05

Abstract: ¹³³Sm was produced via fusion evaporation in the reaction ⁴⁰Ca+⁹⁶Ru. Its β-delayed proton decay was studied by means of “p-γ” coincidence in combination with a He-jet tape transport system, including half-lives, proton energy spectra, γ-transitions following the proton emissions, and the branching ratios to the low-lying states in the grand-daughter nuclei. The possible spins and parities of ¹³³Sm were extracted by fitting the experimental data with a statistical model calculation. The configuration-constrained nuclear potential energy surfaces of ¹³³Sm were calculated by using the Woods-Saxon Strutinsky method. Comparing the experimental and calculated results, the spins and parities of ¹³³Sm were assigned to be 5/2⁺ and 1/2^－, which is reconciled with our published simple (EC+β⁺) decay scheme of ¹³³Sm in 2001. In addition, our experimental data on the beta-delayed proton decay of ¹⁴⁹Yb reported in Eur. Phys. J., 2001, A12: 1—4 was also analyzed by using the same method. The spin and parity of ¹⁴⁹Yb was assigned to be 1/2^－.

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β-Delayed Proton Decays of ¹³³Sm and ¹⁴⁹Yb

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β-Delayed Proton Decays of 133Sm and 149Yb

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β-Delayed Proton Decays of 133Sm and 149Yb

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β-Delayed Proton Decays of ¹³³Sm and ¹⁴⁹Yb

β-Delayed Proton Decays of ¹³³Sm and ¹⁴⁹Yb