Study of Signature Inversion in the πi<SUB>13/2 </SUB>νi<SUB>13/2</SUB>Bands of Odd Odd Nuclei

ZHANG Yu-Hu; ZHOU Xiao-Hong; HE Jian-Jun; LIU Zhong; GAN Zai-Guo

Chinese Physics C> 2003, Vol. 27> Issue(4) : 313-318

Study of Signature Inversion in the πi_13/2νi_13/2Bands of Odd Odd Nuclei

ZHANG Yu-Hu ,
ZHOU Xiao-Hong ,
HE Jian-Jun ,
LIU Zhong ,
GAN Zai-Guo ,
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InstituteofModernPhysics,ChineseAcademyofSciences,Lanzhou 730000,China2 JapanAtomicEnergyResearchInstitute,Tokai,Ibaraki3 19-1195,Japan3 DepartmentofPhysics,KyushuUniversity,Fukuoka 812-81,Japan4 ChibaUniversity,Inage ku,Chiba 263-8512,Japan5 Chiba Instituteof Technology,Narashino,Chiba 275-0023,Japan6 Instituteof Physicsand Tandem Accelerator Center,Universityof Tsukuba,Ibaraki 305-0006,Japan7 China Instituteof Atomic Energy,Beijing 102413,China8 Departmentof Technical Physicsand MOEKey Laboratory,Peking University,Beijing 100871,China

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Abstract：
High-spin states in odd-odd nuclei of ^176,178Ir and ¹⁸²Au have been studied experimentally using heavy-ion- induced fusion-evaporation reactions and standard in-beam γ-ray spectroscopic techniques. Rotational bands built on the πi_13/2νi_13/2 configuration have been observed. In addition, on the basis of level spacing systematics, spin assignments have been proposed for the πi_13/2νi_13/2 band in ¹⁸⁴ Au,which was reported without spin assignments in previous study. It is pointed out that the πi_13/2νi_13/2 bands in ^176,178Ir and ^182,184Au present a low-spin signature inversion. In the theoretical framework of 2-quasiparticle plus rotor model with p- n residual interaction, the signature inversion phenomenon in the πi_13/2νi_13/2 bands has been discussed qualitatively. Theoretical investigations have been performed for the πh_9/2νi_13/2 and πi_13/2 νi_13/2 bands using the cranked shell model. It is found that the signature inversions in both configurations can be well reproduced using the pairing and deformation self-consistent cranked Wood-Saxon calculations.

References

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ZHANG Yu-Hu, ZHOU Xiao-Hong, HE Jian-Jun, LIU Zhong, GAN Zai-Guo, Study of Signature Inversion in the πi_13/2νi_13/2Bands of Odd Odd Nuclei[J]. Chinese Physics C, 2003, 27(4): 313-318.

ZHANG Yu-Hu, ZHOU Xiao-Hong, HE Jian-Jun, LIU Zhong, GAN Zai-Guo, Study of Signature Inversion in the πi_13/2νi_13/2Bands of Odd Odd Nuclei[J]. Chinese Physics C, 2003, 27(4): 313-318. shu

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Received: 2002-06-06
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

Study of Signature Inversion in the πi_13/2νi_13/2Bands of Odd Odd Nuclei

InstituteofModernPhysics,ChineseAcademyofSciences,Lanzhou 730000,China2 JapanAtomicEnergyResearchInstitute,Tokai,Ibaraki3 19-1195,Japan3 DepartmentofPhysics,KyushuUniversity,Fukuoka 812-81,Japan4 ChibaUniversity,Inage ku,Chiba 263-8512,Japan5 Chiba Instituteof Technology,Narashino,Chiba 275-0023,Japan6 Instituteof Physicsand Tandem Accelerator Center,Universityof Tsukuba,Ibaraki 305-0006,Japan7 China Instituteof Atomic Energy,Beijing 102413,China8 Departmentof Technical Physicsand MOEKey Laboratory,Peking University,Beijing 100871,China

Received Date: 2002-06-06

Accepted Date: 1900-01-01

Available Online: 2003-04-05

Abstract: High-spin states in odd-odd nuclei of ^176,178Ir and ¹⁸²Au have been studied experimentally using heavy-ion- induced fusion-evaporation reactions and standard in-beam γ-ray spectroscopic techniques. Rotational bands built on the πi_13/2νi_13/2 configuration have been observed. In addition, on the basis of level spacing systematics, spin assignments have been proposed for the πi_13/2νi_13/2 band in ¹⁸⁴ Au,which was reported without spin assignments in previous study. It is pointed out that the πi_13/2νi_13/2 bands in ^176,178Ir and ^182,184Au present a low-spin signature inversion. In the theoretical framework of 2-quasiparticle plus rotor model with p- n residual interaction, the signature inversion phenomenon in the πi_13/2νi_13/2 bands has been discussed qualitatively. Theoretical investigations have been performed for the πh_9/2νi_13/2 and πi_13/2 νi_13/2 bands using the cranked shell model. It is found that the signature inversions in both configurations can be well reproduced using the pairing and deformation self-consistent cranked Wood-Saxon calculations.

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Study of Signature Inversion in the πi_13/2νi_13/2Bands of Odd Odd Nuclei

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Study of Signature Inversion in the πi_13/2νi_13/2Bands of Odd Odd Nuclei