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

Abstract
HTML
Reference
Related

PDF

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 (unpublished)13.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

[1]	ZHANG Yu-Hu , ZHOU Xiao-Hong , HE Jian-Jun , LIU Zhong , FANG Yong-De , GUO Wen-Tao , LEI Xiang-Guo , GUO Ying-Xiang , MA Long , Moyo Ndontchueng . Search for Signature Inversion in the πi_13/2⊙νi_13/2 Bands in ^182,184,186Au. Chinese Physics C, 2006, 30(S2): 208-210.
[2]	LIU Ying , LIANG Nai-Li , LI Ming-Fei , ZHU Li-Hua , WU Xiao-Guang , HE Chuang-Ye , CUI Xing-Zhu , LI Li-Hua , WANG Zhi-Min , LI Guang-Sheng , WEN Shu-Xian , HUO Jun-De , YANG Ch . Level Structure of ¹⁵⁵Tm. Chinese Physics C, 2006, 30(S2): 160-162.
[3]	SHEN Shui-Fa , WANG Feng-Ge , PENG Nie , CHEN Heng-Gui , LU Hao , WU Yong-Peng . Signature Inversion in the Odd-Odd Nuclei with Mass A～80. Chinese Physics C, 2006, 30(12): 1234-1237.
[4]	ZHOU Wen-Ping , ZHAO Yan-Xin , ZHAO Guang-Yi , MA Ying-Jun , LU Jing-Bin , WANG Shou-Yu , SUN Liang , YANG Dong , LI Xian-Feng , MA Chun-Hui , LIU Yun-Zuo , ZHU Li-Hua , WU Xiao-Gu , , , . New Band Structures and Electromagnetic Properties in ¹⁵⁸Tm. Chinese Physics C, 2006, 30(S2): 151-153.
[5]	JIANG Zhi-Jin , LI Qiang . Study of J/ψ Suppression in Pb-Pb Collisions at 158GeV/c. Chinese Physics C, 2004, 28(8): 846-849.
[6]	LIU Ying , LI Ming-Fei , ZHU Li-Hua , WANG Zhi-Min , WU Xiao-Guang , CUI Xing-Zhu , HE Chuang-Ye , ZHANG Zhen-Long , MENG Rui , MA Rui-Gang , LI Guang-Sheng , WEN Shu-Xian , , . Experimental Study on High Spin States of ¹⁵⁶Tm. Chinese Physics C, 2004, 28(S1): 31-33.
[7]	HE Chuang-Ye , WEN Shu-Xian , ZHU Li-Hua , WANG Zhi-Min , LI Guang-Sheng , MA Rui-Gang , WU Xiao-Guang , YUAN Guan-Jun , YANG Chun-Xiang , WANG Yue , ZHANG Zhen-Long , MENG Rui , , , . Signature Splitting and Inversion and Back Bending in Negative Sideband in ⁸⁰Rb. Chinese Physics C, 2003, 27(9): 784-788.
[8]	HE Xiao-Tao , LIU Shu-Xin , YU Shao-Ying , ZHAO En-Guang . Double-Blocking Effects in Odd-odd Superdeformed Nucleus ¹⁹⁴Tl. Chinese Physics C, 2003, 27(2): 124-126.
[9]	ZHANG Yu-Hu , ZHOU Xiao-Hong , HE Jian-Jun , LIU Zhong , GAN Zai-Guo , , , , , , , , , , . Study of Signature Inversion in the πi_13/2νi_13/2Bands of Odd Odd Nuclei. Chinese Physics C, 2003, 27(4): 313-318.
[10]	ZHANG Yu-Hu . Experimental Study of High-Spin States in Deformed Odd-Odd ¹⁸⁰ Ir. Chinese Physics C, 2002, 26(6): 582-588.
[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.
[12]	DENG Fu-Guo , YANG Chun-Xiang , SUN Hui-Bin , WU Xiao-Guang , LU Jing-Bin , ZHAO Guang-Yi , HAN Guang-Bing , PENG Zhao-Hua , YIN Li-Chang , WEN Shu-Xian , LI Guang-Sheng , YUAN Guan-Ju , , , . Study on the High-Spin States and Signature Inversion of Odd-Odd Nucleus ¹⁷⁰ Ta. Chinese Physics C, 2002, 26(5): 491-500.
[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.
[14]	ZHANG Yu-Hu , WEN Shu-Xian , ZHU Li-Hua . Signature Inversion Phenomena in the Rotational Bands of Odd-Odd ¹⁷⁶Ir. Chinese Physics C, 2002, 26(5): 445-449.
[15]	WU Chong-Shi . Signature Partners in Superdeformed ¹⁴⁹Tb. Chinese Physics C, 2001, 25(3): 205-211.
[16]	ZHANG YuHu . Signature Inversion in the Rotational Bands of Odd-Odd ¹⁷⁸Ir. Chinese Physics C, 2000, 24(12): 1123-1130.
[17]	Sa Benhao , Tai An , Wang Hui . Are There J/ψ Anomalous Suppressions in 158 A GeV/c Pb+Pb Collisions?. Chinese Physics C, 1999, 23(7): 689-692.
[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.

Access

Get Citation

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.

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

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

Article Metric

Article Views(4423)
PDF Downloads(700)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
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.

HTML

Reference (1)

Signature Inversion in Weakly-Deformed Doubly-Odd ¹⁵⁸Tm

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article

Signature Inversion in Weakly-Deformed Doubly-Odd ¹⁵⁸Tm

Corresponding author: MA Ying-Jun,

HTML

目录

Signature Inversion in Weakly-Deformed Doubly-Odd 158Tm

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article

Signature Inversion in Weakly-Deformed Doubly-Odd 158Tm

Corresponding author: MA Ying-Jun,

HTML

目录

Signature Inversion in Weakly-Deformed Doubly-Odd ¹⁵⁸Tm

Signature Inversion in Weakly-Deformed Doubly-Odd ¹⁵⁸Tm