Signature Inversion in Weakly-Deformed Doubly-Odd <SUP>158</SUP>Tm

ZHOU Wen-Ping; MA Ying-Jun; LU Jing-Bin; ZHAO Guang-Yi; WANG Shou-Yu; SUN Liang; YANG Dong; ZHAO Yan-Xin; LI Xian-Feng; LIU Yun-Zuo; ZHU Li-Hua; WU Xiao-Guang; CUI Xing

Chinese Physics C> 2006, Vol. 30> Issue(10) : 988-995

Signature Inversion in Weakly-Deformed Doubly-Odd ¹⁵⁸Tm

Department of Physics, Jilin University, Changchun 130021, China2 China Institute of Atomic Energy, Beijing 102413, China3 Department of Physics, North-East Normal University, Changchun 130024, China

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Abstract：
High-spin states in ¹⁵⁸Tm were populated via the ¹⁴⁴Nd(¹⁹F, 5n) fusion-evaporation reaction at beam energies of 108 and 112MeV. The previously known level structures have been extended and a new band structure has been identified. In addition, a previously identified four-quasiparticle band has been firmly connected to lower known states. This four-quasiparticle band is assigned to the πh_11/2\otimes νh_9/2(α=－1/2)\otimes (νi_13/2)² configuration and thus form a pair of signature partners with another four-quasiparticle band known as being built on the πh_11/2\otimes νh_9/2(α=+1/2)\otimes (νi_13/2)² configuration. The band based on the πh_11/2\otimes νi_13/2 configuration is observed to show anomalous signature splitting persistently, across the spin where a restoration to normal signature splitting is expected from systematics. Signature inversion is also established in the doublet πh_11/2\otimes νh_9/2\otimes (νi_13/2)² bands. Positive triaxial deformation is supposed to play an important role in the occurrence of the unusual signature inversions in the weakly-deformed doubly-odd nucleus ¹⁵⁸Tm.

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ZHOU Wen-Ping, MA Ying-Jun, LU Jing-Bin, ZHAO Guang-Yi, WANG Shou-Yu, SUN Liang, YANG Dong, ZHAO Yan-Xin, LI Xian-Feng, LIU Yun-Zuo, ZHU Li-Hua, WU Xiao-Guang, CUI Xing, Signature Inversion in Weakly-Deformed Doubly-Odd ¹⁵⁸Tm[J]. Chinese Physics C, 2006, 30(10): 988-995.

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Received: 2006-01-24
Revised: 2006-02-23

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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 Inversion in Weakly-Deformed Doubly-Odd ¹⁵⁸Tm

Corresponding author: MA Ying-Jun,

Department of Physics, Jilin University, Changchun 130021, China2 China Institute of Atomic Energy, Beijing 102413, China3 Department of Physics, North-East Normal University, Changchun 130024, China

Received Date: 2006-01-24

Accepted Date: 2006-02-23

Available Online: 2006-10-05

Abstract: High-spin states in ¹⁵⁸Tm were populated via the ¹⁴⁴Nd(¹⁹F, 5n) fusion-evaporation reaction at beam energies of 108 and 112MeV. The previously known level structures have been extended and a new band structure has been identified. In addition, a previously identified four-quasiparticle band has been firmly connected to lower known states. This four-quasiparticle band is assigned to the πh_11/2\otimes νh_9/2(α=－1/2)\otimes (νi_13/2)² configuration and thus form a pair of signature partners with another four-quasiparticle band known as being built on the πh_11/2\otimes νh_9/2(α=+1/2)\otimes (νi_13/2)² configuration. The band based on the πh_11/2\otimes νi_13/2 configuration is observed to show anomalous signature splitting persistently, across the spin where a restoration to normal signature splitting is expected from systematics. Signature inversion is also established in the doublet πh_11/2\otimes νh_9/2\otimes (νi_13/2)² bands. Positive triaxial deformation is supposed to play an important role in the occurrence of the unusual signature inversions in the weakly-deformed doubly-odd nucleus ¹⁵⁸Tm.

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