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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

  • 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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    [1] . Riley M A et al. Phys. Rev., 1989, C39: 2912. Andre S et al. Z. Phys., 1989, A332: 2333. LIU Yun-Zuo, MA Ying-Jun et al. Phys. Rev., 1995, C52:25144. ZHENG Yong, ZHOU Xiao-Hong, LIU Min-Liang et al.HEP NP, 2002, 26(9): 909(in Chinese)(郑勇, 周小红, 柳敏良等. 高能物理与核物理, 2002, 26(9): 909)5. YIN Li-Chang, LIU Yun-Zuo, LU Jing-Bin et al. Eur. Phys.J., 2001, A11: 3796. MA Ying-Jun et al. HEP NP, 1997, 21(11): 970(in Chinese)(马英君等. 高能物理与核物理, 1997, 21(11): 970)7. Bengtsson R, Frauendorf S. Nucl. Phys., 1979, A327: 1398. Donau F. Nucl. Phys., 1987, A471: 4699. Gale S J et al. J. Phys., 1995, G21: 19310. Byrski T et al. Nucl. Phys., 1987, A474: 19311. Riley M A et al. Phys. Rev., 1995, C51: 123412. Gascon J et al. Nucl. Phys., 1987, A467: 539; David Rad-ford et al. (unpublished)13. LI Xian-Feng, MA Ying-Jun, LIU Yun-Zuo et al. Chin.Phys. Lett., 2002, 19: 177914. ZHAO Guang-Yi et al. HEP NP, 2000, 24: 33(in Chinese)(赵广义等. 高能物理与核物理, 2000, 24: 33)15. Cullen D M et al. Phys. Rev., 1998, C57: 217016. Lagergren K et al. Phys. Rev., 2005, C72: 05730317. Espino J M et al. Nucl. Phys., 1998, A640: 16318. Frauendorf S, May F R. Phys. Lett., 1983, 125B: 245

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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
  • 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 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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