Further Research on Level Structures of Neutron-Rich Odd-A Ru Nuclei

ZHU Sheng-Jiang; ZHANG Zheng; XIAO Shu-Dong; CHE Xing-Lai; U Yong-Nan; LI Ming-Liang; ZHENG Ran-Cheng

Chinese Physics C> 2005, Vol. 29> Issue(1) : 23-27

Further Research on Level Structures of Neutron-Rich Odd-A Ru 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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Through analyzing the data with high statistics from measuring high–fold prompt γ–ray coincidence events following the spontaneous fission of ²⁵²Cf with the Gammasphere detector array,the level schemes in neutron–rich odd–A ^109,111Ru nuclei have been extended up to higher spin states.Based on the data analysis of the coincidence matrices with different delay times,the life times for many low excited levels have been obtained in ^{107,109,111,113}Ru nuclei,among them,the 96.4 keV level in ¹⁰⁹Ru is an isomer with life time value 1300ns.It is shows that the observed backbending in the yrast band of the neighboring even-even ¹¹⁰Ru is indeed originated from the alignment of a pair of neutrons through analyzing the moments of inertia J⁽¹⁾vs.rotational frequencies hω of the observed collective bands in ^107,109Ru nuclei.Triaxial rotor plus particle model has been employed to calculate some levels of the collective bands as well as the B(M1)/B(E2) values.The calculated results basically accord with the experimental ones.

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ZHU Sheng-Jiang, ZHANG Zheng, XIAO Shu-Dong, CHE Xing-Lai, U Yong-Nan, LI Ming-Liang and ZHENG Ran-Cheng. Further Research on Level Structures of Neutron-Rich Odd-A Ru Nuclei[J]. Chinese Physics C, 2005, 29(1): 23-27.

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Received: 2004-05-14
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

Further Research on Level Structures of Neutron-Rich Odd-A Ru 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: 2004-05-14

Accepted Date: 1900-01-01

Available Online: 2005-01-05

Abstract: Through analyzing the data with high statistics from measuring high–fold prompt γ–ray coincidence events following the spontaneous fission of ²⁵²Cf with the Gammasphere detector array,the level schemes in neutron–rich odd–A ^109,111Ru nuclei have been extended up to higher spin states.Based on the data analysis of the coincidence matrices with different delay times,the life times for many low excited levels have been obtained in ^{107,109,111,113}Ru nuclei,among them,the 96.4 keV level in ¹⁰⁹Ru is an isomer with life time value 1300ns.It is shows that the observed backbending in the yrast band of the neighboring even-even ¹¹⁰Ru is indeed originated from the alignment of a pair of neutrons through analyzing the moments of inertia J⁽¹⁾vs.rotational frequencies hω of the observed collective bands in ^107,109Ru nuclei.Triaxial rotor plus particle model has been employed to calculate some levels of the collective bands as well as the B(M1)/B(E2) values.The calculated results basically accord with the experimental ones.

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Further Research on Level Structures of Neutron-Rich Odd-A Ru Nuclei

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