β-Delayed Proton Decays of 140Tb and 141Dy as Well as the Spin and Parity of 143Dy

  • 140Tb and 141Dy were produced via fusion evaporation in the reaction 40Ca+106Cd. Their β-delayed proton decays were 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 ground-state spins and parities of 140Tb and 141Dy were extracted as 7± and 9/2±, respectively, by fitting the experimental data with a statistical model calculation. The configuration-constrained nuclear potential energy surfaces (NPES) of 140Tb and 141Dy were calculated by using the Woods-Saxon Strutinsky method, which indicate the ground-state spins and parities of 140Tb and 141Dy to be 7+and 9/2, respectively. In addition, the configuration-constrained NPES of 143Dy was also calculated by using the same method. From the NPES a 1/2+ ground state and a 11/2 isomer with the excitation energy of 198keV were found. The calculated results are consistent with our experimental data on the decay of 143Dy reported in Eur. Phys. J., 2003, A16: 347—351.
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XU Shu-Wei, XIE Yuan-Xiang, XING Ye-Bing, XU Fu-Rong, LIU Hong-Liang and LI Zhan-Kui. β-Delayed Proton Decays of 140Tb and 141Dy as Well as the Spin and Parity of 143Dy[J]. Chinese Physics C, 2006, 30(6): 526-529.
XU Shu-Wei, XIE Yuan-Xiang, XING Ye-Bing, XU Fu-Rong, LIU Hong-Liang and LI Zhan-Kui. β-Delayed Proton Decays of 140Tb and 141Dy as Well as the Spin and Parity of 143Dy[J]. Chinese Physics C, 2006, 30(6): 526-529. shu
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Received: 2005-11-18
Revised: 2006-01-10
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β-Delayed Proton Decays of 140Tb and 141Dy as Well as the Spin and Parity of 143Dy

    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: 140Tb and 141Dy were produced via fusion evaporation in the reaction 40Ca+106Cd. Their β-delayed proton decays were 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 ground-state spins and parities of 140Tb and 141Dy were extracted as 7± and 9/2±, respectively, by fitting the experimental data with a statistical model calculation. The configuration-constrained nuclear potential energy surfaces (NPES) of 140Tb and 141Dy were calculated by using the Woods-Saxon Strutinsky method, which indicate the ground-state spins and parities of 140Tb and 141Dy to be 7+and 9/2, respectively. In addition, the configuration-constrained NPES of 143Dy was also calculated by using the same method. From the NPES a 1/2+ ground state and a 11/2 isomer with the excitation energy of 198keV were found. The calculated results are consistent with our experimental data on the decay of 143Dy reported in Eur. Phys. J., 2003, A16: 347—351.

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