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Chinese Physics C> 2002, Vol. 26> Issue(2) : 164-171 

Particle-Number Conserving Calculation for Low-Lying Excited High-K Multi-Quasiparticle Bands in 172,174Hf

  •  Department of Physics,Peking University,Beijing 100871,China2 Institute of Theoretical Physics,CAS,Beijing 100080,China3 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China4 Department of Physics,Guizhou Normal Uniuersity,Guiyang 550001,China

  • Using the particle-number conserving method for treating the cranked shell model,the microscopic mechanism of the variation of the kinematic moments of inertia with rotational frequency ω for the rare-earth deformed nuclei 172,174Hf is investigated. The observed J(1) and angular momentum alignment are reproduced satisfactorily in the PNC calculation,in which no free parameters are involved. The PNC analysis shows that the difference between the variations of J(1) with ω for the high K multi-quasiparticle bands and for ground state band is mainly due to the Pauli blocking effect of high j intruder orbitals near the Fermi surface.
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    [1] . Khoo T L et al. Phys. Rev. Lett., 1976, 37: 8232. Cullen D M et al. Phys. Rev., 1995, C52: 2415 3. Gjrup N L et al. Nucl. Phys., 1995, A582: 3694. Walker P M et al. Phys. Rev. Lett., 1990, 65: 416 5. Chowdhury R et al. Nucl. Phys., 1999, A645: 651c6. Crowell B et al. Phys. Rev. Lett., 1994, 72: 11647. Rowe D J. Nuclear Collective Motion, 1970, Methuen, London 8. ZENG J Y, LIU S X, LEI Y A et al. Phys. Rev., 2001, C63: 024305 9. ZENG J Y, JINTH, ZHAO Z J. Phys. Rev., 1994, C50: 1388 10. Nilsson S G et al. Nucl. Phys., 1969, A131: 1 11. Bengtsson R, Frauendorf S, May F R. At. Data and Nucl. Data Tables, 1986, 35: 15 12. Dibel M. Nucl. Phys., 1984, A419: 22113. Wakai M, Faessler A. Nucl. Phys., 1978, A295: 8614. Sood P S et al. At. Data and Nucl. Data Tables, 1991, 47: 89 15. Firestone R B et al. Table of Isotopes CD ROM, 8th Edition, 1996

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GONG Lun-Xun, LIU Shu-Xin, ZHU Hong-Bo and ZENG Jin-Yan. Particle-Number Conserving Calculation for Low-Lying Excited High-K Multi-Quasiparticle Bands in 172,174Hf[J]. Chinese Physics C, 2002, 26(2): 164-171.
GONG Lun-Xun, LIU Shu-Xin, ZHU Hong-Bo and ZENG Jin-Yan. Particle-Number Conserving Calculation for Low-Lying Excited High-K Multi-Quasiparticle Bands in 172,174Hf[J]. Chinese Physics C, 2002, 26(2): 164-171. shu
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Received: 2001-04-18
Revised: 1900-01-01
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Particle-Number Conserving Calculation for Low-Lying Excited High-K Multi-Quasiparticle Bands in 172,174Hf

    Corresponding author: GONG Lun-Xun,
  • Department of Physics,Peking University,Beijing 100871,China2 Institute of Theoretical Physics,CAS,Beijing 100080,China3 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China4 Department of Physics,Guizhou Normal Uniuersity,Guiyang 550001,China
  • Received Date: 2001-04-18
  • Accepted Date: 1900-01-01
  • Available Online: 2002-02-05

Abstract: Using the particle-number conserving method for treating the cranked shell model,the microscopic mechanism of the variation of the kinematic moments of inertia with rotational frequency ω for the rare-earth deformed nuclei 172,174Hf is investigated. The observed J(1) and angular momentum alignment are reproduced satisfactorily in the PNC calculation,in which no free parameters are involved. The PNC analysis shows that the difference between the variations of J(1) with ω for the high K multi-quasiparticle bands and for ground state band is mainly due to the Pauli blocking effect of high j intruder orbitals near the Fermi surface.

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