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

Signature Inversion in Weakly-Deformed Doubly-Odd¹⁵⁸Tm

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) ²configuration 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) ²configuration. The band based on the πh _11/2\otimes νi _13/2configuration 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) ²bands. 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-Odd¹⁵⁸Tm

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 in¹⁵⁸Tm were populated via the¹⁴⁴Nd(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)²configuration 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)²configuration. The band based on the πh_11/2\otimes νi_13/2configuration 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)²bands. Positive triaxial deformation is supposed to play an important role in the occurrence of the unusual signature inversions in the weakly-deformed doubly-odd nucleus¹⁵⁸Tm.

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Signature Inversion in Weakly-Deformed Doubly-Odd¹⁵⁸Tm

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