Signature Inversion in Weakly-Deformed Doubly-Odd 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.
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. shu
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Received: 2006-01-24
Revised: 2006-02-23
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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

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 πh11/2\otimes νh9/2(α=-1/2)\otimes (νi13/2)2 configuration and thus form a pair of signature partners with another four-quasiparticle band known as being built on the πh11/2\otimes νh9/2(α=+1/2)\otimes (νi13/2)2 configuration. The band based on the πh11/2\otimes νi13/2 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 πh11/2\otimes νh9/2\otimes (νi13/2)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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