β-Delayed Proton Decays of 133Sm and 149Yb

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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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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

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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