Quasiparticles Plus Rotor Model and the Analysisof Level Statistics of Odd-Odd Nucleus

CHENG Nan-Pu; ZHENG Ren-Rong; ZHU Shun-Quan

Chinese Physics C> 2001, Vol. 25> Issue(8) : 736-742

Quasiparticles Plus Rotor Model and the Analysisof Level Statistics of Odd-Odd Nucleus

Department of Physics, Shanghai Teachers University, Shanghai 200234, China2 Department of Physics, Southwest Normal University, Chongqing 400715, China

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Abstract：
The energy levels of odd-odd nucleus ⁸⁴Y at low spins were calculated by using the axially symmetric particles plus rotor model. In order to study the statistical properties of the energy levels, the two standard tests of Random-Matrix Theory such as the nearest-neighbor level spacings and the spectral rigidity were adopted. It is shown that the chaotic degree of the energy levels initially increases with increasing spin and reaches a maximum around I=10, and then decreases for spins above I≈10. On the other hand, the proton-neutron interaction makes the energy levels slightly regular/ordered. However, the Coriolis force which makes the energy levels chaotic plays a major role in the spectral structure of the odd-odd nucleus ⁸⁴Y.

References

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CHENG Nan-Pu, ZHENG Ren-Rong and ZHU Shun-Quan. Quasiparticles Plus Rotor Model and the Analysisof Level Statistics of Odd-Odd Nucleus[J]. Chinese Physics C, 2001, 25(8): 736-742.

CHENG Nan-Pu, ZHENG Ren-Rong and ZHU Shun-Quan. Quasiparticles Plus Rotor Model and the Analysisof Level Statistics of Odd-Odd Nucleus[J]. Chinese Physics C, 2001, 25(8): 736-742. shu

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Received: 2000-07-19
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

Quasiparticles Plus Rotor Model and the Analysisof Level Statistics of Odd-Odd Nucleus

Corresponding author: CHENG Nan-Pu,

Department of Physics, Shanghai Teachers University, Shanghai 200234, China2 Department of Physics, Southwest Normal University, Chongqing 400715, China

Received Date: 2000-07-19

Accepted Date: 1900-01-01

Available Online: 2001-08-05

Abstract: The energy levels of odd-odd nucleus ⁸⁴Y at low spins were calculated by using the axially symmetric particles plus rotor model. In order to study the statistical properties of the energy levels, the two standard tests of Random-Matrix Theory such as the nearest-neighbor level spacings and the spectral rigidity were adopted. It is shown that the chaotic degree of the energy levels initially increases with increasing spin and reaches a maximum around I=10, and then decreases for spins above I≈10. On the other hand, the proton-neutron interaction makes the energy levels slightly regular/ordered. However, the Coriolis force which makes the energy levels chaotic plays a major role in the spectral structure of the odd-odd nucleus ⁸⁴Y.

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Quasiparticles Plus Rotor Model and the Analysisof Level Statistics of Odd-Odd Nucleus

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