Chinese Physics C > 2006, Vol. 30 > Issue(6): 526-529

β-Delayed Proton Decays of¹⁴⁰Tb and¹⁴¹Dy as Well as the Spin and Parity of¹⁴³Dy

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：
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.

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Received: 2005-11-18
Revised: 2006-01-10

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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 of¹⁴⁰Tb and¹⁴¹Dy as Well as the Spin and Parity of¹⁴³Dy

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:2005-11-18
Accepted Date:2006-01-10
Available Online:2006-06-05

Abstract:¹⁴⁰Tb and¹⁴¹Dy were produced via fusion evaporation in the reaction⁴⁰Ca+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 of140Tb and141Dy 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) of¹⁴⁰Tb and¹⁴¹Dy were calculated by using the Woods-Saxon Strutinsky method, which indicate the ground-state spins and parities of¹⁴⁰Tb and¹⁴¹Dy to be 7⁺and 9/2^－, respectively. In addition, the configuration-constrained NPES of¹⁴³Dy 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 of¹⁴³Dy reported in Eur. Phys. J., 2003, A16: 347—351.