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.

References

[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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[11]	ZENG Guo-Mo , SONG Hui-Chao . Energy Level Structure of Odd-A Tm Isotopes in A≈160 Region. Chinese Physics C, 2002, 26(10): 1021-1026.
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[13]	LU Zhong-Dao , SA Ben-Hao , Amand Faessler . Analysis of Multi-Particle Production in 158 A GeV Pb+Pb Collisions by Two-Source Statistical Model. Chinese Physics C, 2002, 26(5): 501-506.
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[17]	ZHANG YuHu . Signature Inversion in the Rotational Bands of Odd-Odd ¹⁷⁸Ir. Chinese Physics C, 2000, 24(12): 1123-1130.
[18]	Zhang Yuhu , Zhao Qingzhong , Zhou Xiaohong , Sun Xiangfu , Lei Xiangguo , Guo Yingxiang , Liu Zhong , Chen Xinfeng , Zhu Yongtai , Wen Shuxian , Yuan Guanjun , Liu Xiangan . High-Spin States in ¹⁶²Lu and Signature lnversion of Yrast Bands in Doubly Odd Nuclei Around A=160 Mass Region. Chinese Physics C, 1997, 21(5): 393-401.
[19]	Dong Baoguo , Shen Caiwan , Chen Yoagshou . Study of Odd-A Tm Isotopic Chain Properties of Decoupling parameter of [411 1/2] Band. Chinese Physics C, 1997, 21(9): 838-843.
[20]	Pan Feng , Dai Lianrong . Magnetic Moments of Odd A Nuclei in q-Deformed Nuclear Shell Model. Chinese Physics C, 1996, 20(6): 538-545.

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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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Signature Inversion in Weakly-Deformed Doubly-Odd ¹⁵⁸Tm

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