Chinese Physics C > 2004, Vol. 28 > Issue(1): 56-60

Microscopic Mechanism of Moments of Inertia and Odd-even Differences for Well-Deformed Actinide Nuclei

School of Physics,Peking University,Beijing 100871,China2 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China3 Department of Physics,Guizhou Normal University,Guiyang 550001,China

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Abstract：
The microscopic mechanism of the variation with rotational frequency of moments of inertia and their odd-even differences for well-deformed actinide nuclei are analyzed by using the particle-number conserving (PNC) method for treating nuclear pairing interaction. The moments of inertia for bands building on high j intruder orbitals in odd-A nuclei, e.g., the ²³⁵U (ν[743]7/2) band, are found to be much larger than those of ground-state bands in neighboring even-even nuclei. Moreover, there exist large odd-even differences in the ω variation of moments of inertia. All these experimental odd-even differences are reproduced quite well in the PNC calculation, in which the effective monopole and quadrupole pairing interaction strengths are determined by the experimental odd-even differences in binding energies and bandhead moments of inertia, and no free parameter is involved in the PNC calculation.

References

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.Bohr A,Mottelson B M.Nuclear Structure Vol.Ⅱ ,New York: Ben..jamin,19752.Firestone F B et al.Table of Isotopes,1996,CD..ROM3.ZENG J Y,LEI Y A,JIN T H et al.Phys.Rev.,1994,C50: 7464.ZENG J Y,LIU S X,LEI Y A et al.Phys.Rev.,2001,C63: 0243055.ZENG J Y,LIU S X,GONG L X et al.Phys.Rev.,2002,C65:0443076.Nilsson S G et al.Nucl.Phys.,1969,A131:17.Bengtsson R,Frauendorf S,May F R At.Data Nucl.Data Tables,1986,35: 158.Rowe D J.Nuclear Collect ive Motion,London: Methuen,1970

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YU Lei, LIU Shu-Xin and ZENG Jin-Yan. Microscopic Mechanism of Moments of Inertia and Odd-even Differences for Well-Deformed Actinide Nuclei[J]. Chinese Physics C, 2004, 28(1): 56-60.

YU Lei, LIU Shu-Xin and ZENG Jin-Yan. Microscopic Mechanism of Moments of Inertia and Odd-even Differences for Well-Deformed Actinide Nuclei[J]. Chinese Physics C, 2004, 28(1): 56-60. shu

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Received: 2003-05-14
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

Microscopic Mechanism of Moments of Inertia and Odd-even Differences for Well-Deformed Actinide Nuclei

Corresponding author:ZENG Jin-Yan,

School of Physics,Peking University,Beijing 100871,China2 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China3 Department of Physics,Guizhou Normal University,Guiyang 550001,China

Received Date:2003-05-14
Accepted Date:1900-01-01
Available Online:2004-01-05

Abstract:The microscopic mechanism of the variation with rotational frequency of moments of inertia and their odd-even differences for well-deformed actinide nuclei are analyzed by using the particle-number conserving (PNC) method for treating nuclear pairing interaction. The moments of inertia for bands building on high j intruder orbitals in odd-A nuclei, e.g., the²³⁵U (ν[743]7/2) band, are found to be much larger than those of ground-state bands in neighboring even-even nuclei. Moreover, there exist large odd-even differences in the ω variation of moments of inertia. All these experimental odd-even differences are reproduced quite well in the PNC calculation, in which the effective monopole and quadrupole pairing interaction strengths are determined by the experimental odd-even differences in binding energies and bandhead moments of inertia, and no free parameter is involved in the PNC calculation.