High-Spin States and Negative Parity Levels in Neutron-Rich <SUP>116,118,120</SUP>Cd Nuclei

XIAO Shu-Dong; ZHU Sheng-Jiang; YANG Li-Ming; ZHANG Zheng; JIANG Zhuo; CHE Xing-Lai; U Yong-Nan

Chinese Physics C> 2004, Vol. 28> Issue(1) : 37-41

High-Spin States and Negative Parity Levels in Neutron-Rich ^116,118,120Cd Nuclei

Department of Physics,Tsinghua University,Beijing 100084,China2 Department of Physics,Vanderbilt University,Nashville,TN 37235,USA3 Lawrence Berkeley National Laboratory,Berkeley,CA 94720,USA4 Department of Physics,Mississippi State University,MS 39762,USA

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High spin states in neutron-rich ^116,118,120Cd nuclei have been investigated by observing high-fold prompt γ-ray coincidence events from the spontaneous fission of ²⁵²Cf with the Gammasphere detector array. The yrast bands have been extended with spin up to 18h in¹¹⁸Cd and 16h in ^116,120Cd respectively. The band structures are calculated using the cranked shell model and possible origination for the backbends in the yrast bands is discussed. Proposed 5^－ and 7^－ levels are observed in each of these cadmium isotopes, and possible explanation for the negative states is discussed based on systematic comparison. A quasi-rotational band based on 7^－ level in ¹¹⁸Cd has been established.

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XIAO Shu-Dong, ZHU Sheng-Jiang, YANG Li-Ming, ZHANG Zheng, JIANG Zhuo, CHE Xing-Lai and U Yong-Nan. High-Spin States and Negative Parity Levels in Neutron-Rich ^116,118,120Cd Nuclei[J]. Chinese Physics C, 2004, 28(1): 37-41.

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Received: 2003-05-16
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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

High-Spin States and Negative Parity Levels in Neutron-Rich ^116,118,120Cd Nuclei

Corresponding author: ZHU Sheng-Jiang,

Department of Physics,Tsinghua University,Beijing 100084,China2 Department of Physics,Vanderbilt University,Nashville,TN 37235,USA3 Lawrence Berkeley National Laboratory,Berkeley,CA 94720,USA4 Department of Physics,Mississippi State University,MS 39762,USA

Received Date: 2003-05-16

Accepted Date: 1900-01-01

Available Online: 2004-01-05

Abstract: High spin states in neutron-rich ^116,118,120Cd nuclei have been investigated by observing high-fold prompt γ-ray coincidence events from the spontaneous fission of ²⁵²Cf with the Gammasphere detector array. The yrast bands have been extended with spin up to 18h in¹¹⁸Cd and 16h in ^116,120Cd respectively. The band structures are calculated using the cranked shell model and possible origination for the backbends in the yrast bands is discussed. Proposed 5^－ and 7^－ levels are observed in each of these cadmium isotopes, and possible explanation for the negative states is discussed based on systematic comparison. A quasi-rotational band based on 7^－ level in ¹¹⁸Cd has been established.

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High-Spin States and Negative Parity Levels in Neutron-Rich ^116,118,120Cd Nuclei

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High-Spin States and Negative Parity Levels in Neutron-Rich ^116,118,120Cd Nuclei

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High-Spin States and Negative Parity Levels in Neutron-Rich 116,118,120Cd Nuclei

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High-Spin States and Negative Parity Levels in Neutron-Rich 116,118,120Cd Nuclei

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High-Spin States and Negative Parity Levels in Neutron-Rich ^116,118,120Cd Nuclei

High-Spin States and Negative Parity Levels in Neutron-Rich ^116,118,120Cd Nuclei