Signature splitting of the πh11/2 band and high-spin structures in 155Tb

LI Tao; CHEN Bao-Ren; LIU Shu-Xin

doi:10.1088/1674-1137/34/7/006

Chinese Physics C> 2010, Vol. 34> Issue(7) : 958-963 DOI: 10.1088/1674-1137/34/7/006

Signature splitting of the πh_11/2 band and high-spin structures in ¹⁵⁵Tb

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Abstract：
Seven experimentally observed bands of ¹⁵⁵Tb are analyzed in detail, using the particle-number-conserving method for treating the cranked shell model with monopole and quadrupole pairing interactions. We satisfactorily reproduce the experimental alignments and especially focus on the microscopic mechanism of the second back-bending and the influence of pair interaction on ultrahigh spins. Our calculated results show that the πi_13/2 orbitals are too high to give a contribution to the moment of inertia below hω≈0.7 MeV. Instead, the crossing between the π[541]1/2 and other proton orbitals is responsible for the second back-bending. We assign a possible configuration to the decoupled band found in ¹⁵⁵Tb and predict eleven bands which are experimentally unobserved.

References

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LI Tao, CHEN Bao-Ren and LIU Shu-Xin. Signature splitting of the πh_11/2 band and high-spin structures in ¹⁵⁵Tb[J]. Chinese Physics C, 2010, 34(7): 958-963. doi: 10.1088/1674-1137/34/7/006

LI Tao, CHEN Bao-Ren and LIU Shu-Xin. Signature splitting of the πh_11/2 band and high-spin structures in ¹⁵⁵Tb[J]. Chinese Physics C, 2010, 34(7): 958-963. doi: 10.1088/1674-1137/34/7/006 shu

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Received: 2009-08-10
Revised: 2009-12-22

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Signature splitting of the πh_11/2 band and high-spin structures in ¹⁵⁵Tb

Corresponding author: LIU Shu-Xin,

Received Date: 2009-08-10

Accepted Date: 2009-12-22

Available Online: 2010-07-05

Abstract:

Seven experimentally observed bands of ¹⁵⁵Tb are analyzed in detail, using the particle-number-conserving method for treating the cranked shell model with monopole and quadrupole pairing interactions. We satisfactorily reproduce the experimental alignments and especially focus on the microscopic mechanism of the second back-bending and the influence of pair interaction on ultrahigh spins. Our calculated results show that the πi_13/2 orbitals are too high to give a contribution to the moment of inertia below hω≈0.7 MeV. Instead, the crossing between the π[541]1/2 and other proton orbitals is responsible for the second back-bending. We assign a possible configuration to the decoupled band found in ¹⁵⁵Tb and predict eleven bands which are experimentally unobserved.

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Signature splitting of the πh_11/2 band and high-spin structures in ¹⁵⁵Tb

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通讯作者: 陈斌, bchen63@163.com

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Signature splitting of the πh_11/2 band and high-spin structures in ¹⁵⁵Tb

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