Level Scheme of High-Spin States in <SUP>145</SUP>Tb

ZHENG Yong; ZHOU Xiao-Hong; ZHANG Yu-Hu; LIU Zhong; PAN Qiang-Yan; GAN Zai-Guo

Chinese Physics C> 2002, Vol. 26> Issue(4) : 359-363

Level Scheme of High-Spin States in ¹⁴⁵Tb

ZHENG Yong ,
ZHOU Xiao-Hong ,
ZHANG Yu-Hu ,
LIU Zhong ,
PAN Qiang-Yan ,
GAN Zai-Guo ,
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Institue of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China2 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195,Japan3 Chiba University, Inage-ku, Chiba 263-8512, Japan4 Chiba Institute of Technology, Narashino, Chiba 275-0023,Japan

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Abstract：
High-spin states of ¹⁴³Tb have been studied via the ¹¹⁸Sn(³²S,1p4n)¹⁴⁵Tb reaction by means of in-beam γ-ray spectroscopy. Measurements of γ-ray excitation functions and γ-γ-t coincidences were performed with 12 BGO(AC)HPGe detectors. A level scheme for ¹⁴⁵Tb including 41 γ-rays which come from the deexcitations of the 24 levels, has been established for the first time based on an analysis of the γ-ray excitation functions, γ-γ coincidence relationships, intensity balances and cross-over transitions. The spins for most of the levels in the scheme are assigned according to the results of the measured γ-ray anisotropies. Considering the structure similarity between ¹⁴³Eu and ¹⁴⁵Tb, the low-lying levels in 145Tb are interpreted by coupling a h_9/2 proton to the excited states in ¹⁴⁴Gd core.

References

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ZHENG Yong, ZHOU Xiao-Hong, ZHANG Yu-Hu, LIU Zhong, PAN Qiang-Yan, GAN Zai-Guo, Level Scheme of High-Spin States in ¹⁴⁵Tb[J]. Chinese Physics C, 2002, 26(4): 359-363.

ZHENG Yong, ZHOU Xiao-Hong, ZHANG Yu-Hu, LIU Zhong, PAN Qiang-Yan, GAN Zai-Guo, Level Scheme of High-Spin States in ¹⁴⁵Tb[J]. Chinese Physics C, 2002, 26(4): 359-363. shu

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Received: 2001-06-27
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

Level Scheme of High-Spin States in ¹⁴⁵Tb

Institue of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China2 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195,Japan3 Chiba University, Inage-ku, Chiba 263-8512, Japan4 Chiba Institute of Technology, Narashino, Chiba 275-0023,Japan

Received Date: 2001-06-27
Accepted Date: 1900-01-01
Available Online: 2002-04-05

Abstract: High-spin states of ¹⁴³Tb have been studied via the ¹¹⁸Sn(³²S,1p4n)¹⁴⁵Tb reaction by means of in-beam γ-ray spectroscopy. Measurements of γ-ray excitation functions and γ-γ-t coincidences were performed with 12 BGO(AC)HPGe detectors. A level scheme for ¹⁴⁵Tb including 41 γ-rays which come from the deexcitations of the 24 levels, has been established for the first time based on an analysis of the γ-ray excitation functions, γ-γ coincidence relationships, intensity balances and cross-over transitions. The spins for most of the levels in the scheme are assigned according to the results of the measured γ-ray anisotropies. Considering the structure similarity between ¹⁴³Eu and ¹⁴⁵Tb, the low-lying levels in 145Tb are interpreted by coupling a h_9/2 proton to the excited states in ¹⁴⁴Gd core.