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

  • 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 107,109,111,113Ru 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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  • [1] . ZHU S J, GAN C Y, Hamilton J H et al. Chin. Phys. Lett . , 1998,15: 7932. Hwang J K, Ramayya A V, Hamilton J H et al . J. Phys. , 1998,G24: L93. ZHU S J, Hamilton JH, Ramayya A V et al. Phys. Rev. , 2001, C65:0143074. ZHU Sheng-Jiang, XU Rui-Qing, Hamilton J H et al . High EnergyPhys. and Nucl. Phys. , 2002, 26: 791 5. Fot iades N, Cizewski J A, Krücken R et al. Phys. Rev. , 2000, C61:0643266. ZHANG Z, ZHU S J, Hamilton J H et al. Phys. Rev. , 2003, C67:0643077. ZHANG Zheng, ZHU Sheng-Jiang, Hamilt on J H et al. High EnergyPhys. and Nucl. Phys. , 2003, 27: 688 8. Hamilton J H, Ramayya A V, ZHU S J et al. Prog. Part. Nucl.Phys. , 1995, 35: 6359. ZHU S J, LU Q H, Hamilton J H et al. Phys. Lett . , 1995, B357:27310. ZHU S J, Hamilton J H, Ramayya A V et al. Phys. Rev. , 1999,C59: 131611. Radford D C.Nucl. Instrum. Methods Phys. Res. , 1995, A361: 29712. Aryaeinejad R, Cole J D, Greenwood R C et al. Phys. Rev. , 1993,C48: 56613. XIAO Shu-Dong, ZHU Sheng-Jiang, Hamilton J H et al. High Energy Phys. and Nucl. Phys. , 2004, 28: 3714. JIANG Z, ZHU S J, Hamilton JH et al. Chin. Phys. Lett . , 2003, 20:35015. XING Zheng, CHEN Xing-Qu, XU Shu-Wei. High Energy Phys. and Nucl . Phys. , 1996, 20: 8516. LU Q H, Butler-Moore K, ZHU S J et al. Phys. Rev. , 1995, C52:1348
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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.
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. shu
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Received: 2004-05-14
Revised: 1900-01-01
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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

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 107,109,111,113Ru 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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