Chinese Physics C > 2004, Vol. 28 > Issue(5): 495-501

Experimental Observation of High Spin States in¹³⁵La Nucleus

Institute of Modern Physics,The Chinese Academy of Science,Lanzhou 730000,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China3 Department of Physics,Jilin University,Changchun 130012,China4 Institute of Physics and Tandem Accelerator Center,University of Tsukuba,Ibaraki 305-006,Japan

Abstract
HTML
Reference
Related

PDF

Abstract：
High spin states of ¹³⁵La have been experimentally studied by using ¹²⁸Te( ¹⁰B, 3n) ¹³⁵La reaction at 46 MeV beam energy. Based on the γ-γ coincidence relationships, relative intensities and ADO ratios, a level scheme of ¹³⁵La has been established. Both signature components of the πh _11/2negative-parity band and a band crossing at ω≈0.40MeV were observed. In view of the systematics of the N=78 isotones, this backbending is proposed to be caused by the alignment of a pair of πh _11/2protons. The πh _11/2protons drive the nuclear core towards γ≈0°, the collective prolate shape. In addition, a ΔI=1 negative-parity band with strong M1 transitions and a very small signature splitting was observed. Comparing with the systematic features of ΔI=1 bands in neighboring odd-proton nuclei in this mass region, the πh _11/2(νh _11/2) ²configuration was assigned to the ΔI=1 bands of ¹³⁵La. The alignment of the h _11/2neutron pair drives the nuclear core towards γ≈-60°, the collective oblate shape.

References

[1]

. Ragnarsson I, Sobiczewski A et al. Nucl . Phys. , 1974, A233: 3292. CHEN Y S, Frauendorf S, Leander G A. Phys. Rev. , 1983, C28:24373. Hildingson L, Klamra W, Lindblad Th et al. Z. Phys. , 1991, A338:1254. Xu N, Beausang C W, Paul E S et al. Phys. Rev. , 1987, C36: 16495. Xu N, Beausang C W, Ma R et al. Phys. Rev. , 1989, C39: 17996. Xu N, Beausang C W, Hughes J R et al . Phys. Rev. , 1991, C43:21897. Paul E S, Beausang C W, Fossan D B et al. Phys. Rev. Lett . , 1987,58: 9848. Leigh J R, Nakai K, Maier K H et al. Nucl. Phys. , 1973, A213: 19. Chiba J, Hayano R S, Sekimoto M et al. Journal of The Physical Society of Japan, 1977, 43: 110910. Stephens F S, Diamond R M, Leigh J R. Phys. Rev. Lett. , 1972,29: 43811. St ephens F S, Diamond R M, Nilsson S G. Phys. Lett . , 1973, B44:42912. ZHENG Yong, ZHOU Xiao-Hong, LIU Min-Liang et al. High Energy Phys. and Nucl. Phys. , 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)13. Sergeenkov Y V, Singh B. Nucl . Data Sheets. , 1998, 84: 11514. Bengt sson R, Frauendorf S. Nucl . Phys. , 1979, A314: 2715. Bengt sson R, Frauendorf S. Nucl . Phys. , 1979, A327: 13916. Harris S M. Phys. Rev. , 1965, B509: 13817. Morek T, Beuscher H, Bochev B et al. Z. Phys. , 1980, A298: 26718. Paul E S, Fossan D B, LIANG Y et al. Phys. Rev. , 1990, C41: 157619. Beausang CW, Fossan D B, Ma R et al. Phys. Rev. , 1989, C39: 471

[1]	ZHOU Xiao-Hong,M.Oshima,ZHANG Yu-Hu,M.Koizumi,A.Osa,T.Hayakawa,Y.Hatsukawa,T.Shizuma,M.Sugawara. High-spin States in 190Pt*. Chinese Physics C, 2008, 32(1): 31-33.doi:10.1088/1674-1137/32/1/007
[2]	HUA Hui,WAMG Shuo,MENG Jie,LI Zhi-Huan,ZHANG Shuang-Quan,XU Fu-Rong,LIU Hong-Liang,ZHOU Shan-Gui,YE Yan-Lin,JIANG Dong-Xing,ZHENG Tao,ZHU Li-Hua,WU Xiao-G,,,. High-Spin States in¹⁵²Gd. Chinese Physics C, 2006, 30(S2): 157-159.
[3]	ZHU Sheng-Jiang,LI Ming-Liang,CHE Xing-Lai,XIAO Shu-Dong,CHEN Yong-Jing,YU Ying-Nan,DING Hui-Bo,XU Qiang,ZHU Li-Hua,WEN Shu-Xian,WU Xiao-Guang,LI Guang-Sheng,. Collective Band Structures of the Nuclei near N=82 Closed Shell in A=135 Region. Chinese Physics C, 2006, 30(S2): 141-145.
[4]	SONG Li-Tao,ZHOU Xiao-Hong,ZHANG Yu-Hu,GUO Ying-Xiang,LEI Xiang-Guo,ZHENG Yong,LIU Min-Liang,de Angelis. Experimental Study of High-Spin Band Structures of¹⁸³Au. Chinese Physics C, 2005, 29(8): 736-740.
[5]	XIAO Shu-Dong,ZHU Sheng-Jiang,YANG Li-Ming,ZHANG Zheng,JIANG Zhuo,CHE Xing-Lai,U Yong-Nan. High-Spin States and Negative Parity Levels in Neutron-Rich^116,118,120Cd Nuclei. Chinese Physics C, 2004, 28(1): 37-41.
[6]	WANG Hua-Lei,ZHANG Yu-Hu,ZHOU Xiao-Hong,GUO Ying-Xiang,LEI Xiang-Guo,LIU Min-Liang,LUO Peng,XIE Cheng-Ying,SONG Li-Tao,YU Hai-Ping,ZHENG Yong,GUO Wen-Tao,,,,. Experimental Study of High-Spin States in Odd-Odd¹⁷⁰Re. Chinese Physics C, 2004, 28(7): 699-705.
[7]	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 of¹⁵⁶Tm. Chinese Physics C, 2004, 28(S1): 31-33.
[8]	WANG Zhi-Min¹,WEN Shu-Xian¹,WU Xiao-Guang¹,PENG Zhao-Hua¹,LI Guang-Sheng¹,YUAN Guan-Jun¹,MA Rui-Gang¹,HE Chuang-Ye¹,YANG Chun-Xiang¹,GUO Ying-Xiang²,LEI Xiang-Guo²,HE Jian-Jun. Study on High Spin States. Chinese Physics C, 2003, 27(1): 24-27.
[9]	ZHANG Yu-Hu,ZHOU Xiao-Hong. Experimental Study of High-Spin Band Structures in Odd-Odd¹⁷²Re. Chinese Physics C, 2003, 27(7): 574-580.
[10]	DONG Bao-Guo,GUO Hong-Chao,Ingemar Ragnarsson. Shape Coexistence and Band Termination in¹³¹La. Chinese Physics C, 2002, 26(3): 266-272.
[11]	ZHANG Yu-Hu. Experimental Study of High-Spin States in Deformed Odd-Odd¹⁸⁰Ir. Chinese Physics C, 2002, 26(6): 582-588.
[12]	HE Jian-Jun,ZHANG Yu-Hu,GUO Ying-Xiang,ZHOU Xiao-Hong,LEI Xiang-Guo,HUANG Wen-Xue,FENG Xi-Chen,ZHANG Shuang-Quan,XU Xiao,LIU Zhong,LUO Yi-Xiao,WEN Shu-Xian,WU Xiao-Guang,YUAN Guan-Jun. Investigation of High-Spin States in¹⁴³Pm. Chinese Physics C, 2001, 25(9): 828-833.
[13]	ZHAO GuangYi,LI GuangSheng,WU XiaoGuang,LIU XiangAn,WEN ShuXian,LU JingBin,YUAN GuanJun,YANG ChunXing. Study of High Spin Stateal in Transitional Nucleus⁸⁷Zr. Chinese Physics C, 2000, 24(3): 213-219.
[14]	ZHANG Yu-Hu,ZHAO Qing-Zhong,ZHANG Shuang-Quan,ZHOU Xiao-Hong,XU Hu-Shan,HUANG Wen-Xue,GUO Ying-Xiang,LEI Xiang-Guo,LIU Zhong,LU Jun,FENG Xi-Chen,GOU Quan-Bu,,,,. Experimental Study of High-spin States in Odd-Odd Nuclei around 160-180 Mass Region. Chinese Physics C, 2000, 24(S1): 21-28.
[15]	Han Guangbing,Wen Shuxian,Liu Xiangun,Wu Xiaoguang,Li Guangsheng,Yuan Guanjun,Weng Peikun,Yang Chunxiang,Ma Yingjun,Lu Jingbin. Study of the High Spin States of Stable⁸⁴Sr. Chinese Physics C, 1999, 23(7): 601-606.
[16]	Zhang Yuhu. Experimental Observation of High Spin States in¹⁴⁶Sm Nucleus. Chinese Physics C, 1997, 21(2): 110-115.
[17]	Zhou Xiaohong,Sun Xiangfu,Guo Yingxiang,Lei Xiangguo,liu Zhong,Zhang Yuhu,Chen Xinfeng,Jin Hanjuan,Luo Yixiao,Wen Shuxian,Yuan Guanjun,Li Guangsheng,Yang Chunxiang. High-Spin States in¹⁹⁸Bi. Chinese Physics C, 1996, 20(9): 769-777.
[18]	Sang Jianping,Liu Yong. Microscopic investigation of High-Spin States for Even-Even Nuclei(Ⅰ) Approach. Chinese Physics C, 1994, 18(10): 936-942.
[19]	SHEN Xiao-Yan,HU Ji-Min. The Semiclassical Study of Nuclear High Spin States. Chinese Physics C, 1991, 15(8): 720-729.
[20]	ZHANG Tian-Bao,ZHU Yu-Can,WANG Hai-Dong,WANG Ya-Dong,REN Shao-Xia,XIAO Hong,ZHANG Jin. Investigation of the Scintillation Properties of Domestic BaF₂(La) Crystal. Chinese Physics C, 1991, 15(6): 481-485.

Access

Get Citation

LUO Peng, ZHANG Yu-Hu, ZHOU Xiao-Hong, LIU Min-Liang, GUO Ying-Xiang, LIU Zhong, LEI Xiang-Guo, SONG Li-Tao, ZHENG Yong, WANG Hua-Lei, YU Hai-Ping, XIE Cheng-Ying and Experimental Observation of High Spin States in ¹³⁵La Nucleus[J]. Chinese Physics C, 2004, 28(5): 495-501.

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2003-10-16
Revised: 1900-01-01

Article Metric

Article Views(5270)
PDF Downloads(608)
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

Experimental Observation of High Spin States in¹³⁵La Nucleus

Corresponding author:ZHANG Yu-Hu,

Institute of Modern Physics,The Chinese Academy of Science,Lanzhou 730000,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China3 Department of Physics,Jilin University,Changchun 130012,China4 Institute of Physics and Tandem Accelerator Center,University of Tsukuba,Ibaraki 305-006,Japan

Received Date:2003-10-16

Accepted Date:1900-01-01

Available Online:2004-05-05

Abstract:High spin states of¹³⁵La have been experimentally studied by using¹²⁸Te(¹⁰B, 3n)¹³⁵La reaction at 46 MeV beam energy. Based on the γ-γ coincidence relationships, relative intensities and ADO ratios, a level scheme of¹³⁵La has been established. Both signature components of the πh_11/2negative-parity band and a band crossing at ω≈0.40MeV were observed. In view of the systematics of the N=78 isotones, this backbending is proposed to be caused by the alignment of a pair of πh_11/2protons. The πh_11/2protons drive the nuclear core towards γ≈0°, the collective prolate shape. In addition, a ΔI=1 negative-parity band with strong M1 transitions and a very small signature splitting was observed. Comparing with the systematic features of ΔI=1 bands in neighboring odd-proton nuclei in this mass region, the πh_11/2(νh_11/2)²configuration was assigned to the ΔI=1 bands of¹³⁵La. The alignment of the h_11/2neutron pair drives the nuclear core towards γ≈-60°, the collective oblate shape.

HTML

Reference (1)

Experimental Observation of High Spin States in¹³⁵La Nucleus

Abstract：

References

Access

Article Metrics

Metrics

通讯作者:陈斌, bchen63@163.com

Email This Article