New Low-spin Levels in <SUP>76</SUP>Se and Discussion of Its Yrast Band Structure

SHEN Shui-Fa; LI Yan; GU Jia-Hui

Chinese Physics C> 2005, Vol. 29> Issue(2) : 139-146

New Low-spin Levels in ⁷⁶Se and Discussion of Its Yrast Band Structure

Shanghai Institute of Applied Physics,the Chinese Academy of Sciences,Shanghai 201800,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100049,China

Abstract
HTML
Reference
Related

PDF

Abstract：
The decay of bromine–76 was studied using compton–suppressed spectrometer and high–purity ge detectors in singles and coincidence mode, respectively. bromine–76 was produced via two reactions,i. e.,⁷⁵As(α,3n)⁷⁶Br and ⁷⁶Se(p, n)⁷⁶Br.the results of these experiments verified the previously reported levels and gammas of ⁷⁶Se. in addition to the previously described transitions and levels, 39 new γ–rays and 15 new energy levels were found for the first time. spins and parities for new levels are proposed based on the calculated logft values, de–excitation modes of the observed states, and some nuclear reaction experiment results. a new decay scheme of ⁷⁶Br is proposed in the present work. combining with the high–spin states observed by the in–beam γ–ray spectroscopy of a previous decay work, the positive–parity yrast states were compared with the results from calculations in the framework of the projected shell model.

References

[1]

. Lecomt e R, Paradis P, Barrette J et al . Nucl . Phys. , 1977, A284: 1232. Allan Bromley D. Treat ise on Heavy-Ion Physics. Vol. 8. New York,London: Plenum Press, 19893. Hamilton J H et al. Phys. Rev. Lett. , 1974, 32: 2394. Hamilton J H et al. Phys. Rev. Lett. , 1976, 36: 3405. Singh B, Viggars D A. Nucl. Data Sheet s, 1984, 42: 2336. Singh B. Nucl . Data Sheets, 1995, 74: 637. Ladenbauer-Bellis I M et al . Can. J. Phys. , 1971, 49: 548. Vylov Ts, Dzhelepov B S, Dmit riev A G et al . Proc. 25th Ann. Conf .Nucl. Spectrosc. Struct . At. Nucl ei. Leningrad: 1975. 669. Nagahara T et al. J. Phys. Soc. Jap. , 1974, 37: 110. Dzhelepov B S et al. Izv. Akad. Nauk SSSR, Ser. Fiz. 1969, 33: 14;Bull. Acad. Sci. USSR, Phys. Ser. 1970, 33: 1411. LI Yan et al. Nuclear Science and Techniques, 1998, 9: 19912. Dzhelepov B S, Dmitriev A G, Zhukovskii N N. Izv. Akad. NaukSSSR, Ser. Fiz. 1971, 35: 2249; Bull. Acad. Sci. USSR, Phys.Ser. 1972, 35: 204313. Audi G, Wapstra A H. Nucl. Phys. , 1993, A565: 114. Aage Bohr, Ben R. Mottelson. Nuclear Structure. New York, Amsterdam: Benjamin, 1969. 16915. Mller P et al . Atom. Data and Nucl. Data Tables, 1995, 59: 18516. ZHANG Jing-Ye et al. Phys. Rev. , 1989, C39: 71417. Bengtsson T, Ragnarsson I. Nucl. Phys. , 1985, A436: 1418. SUN Yang et al. Phys. Rev. , 2000, C62: 02160119. Subber A R H et al . J. Phys. , 1987, G13: 80720. Matoba M, Hyakutake M, Koori N et al. Nucl. Phys. , 1979, A325: 38921. Matoba M. Phys. Lett . , 1979, B88: 24922. Wells J C Jr et al. Phys. Rev. , 1980, C22: 112623. SUN Yang, WU Cheng-Li. Phys . Rev. , 2003, C68: 024315

[1]	CHEN Yong-Bo , SHEN Shui-Fa , XU Fu-Rong , ZHENG Shi-Jie . Newly Discovered Candidate of the Member of Three-Phonon Multiplet in ⁷⁶Se. Chinese Physics C, 2007, 31(7): 642-646.
[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]	ZHANG Yu-Hu , LIU Min-Liang , de Angelis , GUO Wen-Tao . Level Scheme of ⁹⁴ Mo at High Angular Momentum. Chinese Physics C, 2004, 28(9): 941-946.
[4]	LIU Min-Liang , ZHANG Yu-Hu , ZHOU Xiao-Hong , GUO Ying-Xiang , LIU Zhong , LEI Xiang-Guo , HE Jian-Jun , ZHENG Yong , ZHU Li-Hua , WEN Shu-Xian . Empirical Shell Model and High-Spin Level Structure of Near-spherical Nucleus ¹⁴²Pm. Chinese Physics C, 2004, 28(S1): 62-65.
[5]	WANG Shou-Yu , MA Ying-Jun , LIU Yun-Zuo , ZHANG Yu-Hu , LIANG Guo-Dong . High-Spin Level Scheme of ¹²⁶Cs. Chinese Physics C, 2004, 28(5): 491-494.
[6]	Failh H , LONG Gui-Lu . Symmetry and Mixed Symmetry Band Structures in Low-lying Levels of ^76—84Kr Isotopes. Chinese Physics C, 2004, 28(7): 717-724.
[7]	XIE Cheng-Ying , ZHOU Xiao-Hong , ZHENG Yong , ZHANG Yu-Hu , LIU Zhong , PAN Qiang-Yan , GAN Zai-Guo . Study of Level Structure in ¹⁴⁶Tb. Chinese Physics C, 2003, 27(10): 884-887.
[8]	ZHENG Yong , ZHOU Xiao-Hong , ZHANG Yu-Hu , LIU Zhong , PAN Qiang-Yan , GAN Zai-Guo , , , , , , , , , . Level Scheme of High-Spin States in ¹⁴⁵Tb. Chinese Physics C, 2002, 26(4): 359-363.
[9]	ZHANG Yu-Hu , MA Ying-Jun . A New Level Scheme of ¹²⁷I. Chinese Physics C, 2002, 26(2): 104-107.
[10]	XU Yan-Bing , LIAO Ji-Zhi . Studies on the HF States and the Negative Parity Bands of Even Even Ge and Se Nuclei. Chinese Physics C, 2002, 26(6): 613-619.
[11]	ZHOU Xiao-Hong , GUO Ying-Xiang , ZHU Shao-Fei , LEI Xiang-Guo , LIU Min-Liang , LIU Zhong , ZHANG Yu-Hu , HE Jian-Jun , ZHENG Yong , LUO Yi-Xiao . Level Structure in ²⁰⁹Fr. Chinese Physics C, 2001, 25(8): 725-730.
[12]	Yu Xiaohan , Shi Shuanghui , Gu Jiahui , Liu Jingyi , Li Wenxin , Zeng Jiping , Tian Jiaqi , Li Yan , Zhou Jianzhong . Low-lying Level Structure of ⁸³Rb. Chinese Physics C, 1998, 22(12): 1082-1091.
[13]	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.
[14]	Ma Yingjun , Zhao Guangyi , Wang Zhe , Zheng Hua , Liu Yunzuo , Zhou Shangui , Wu Xiaoguang , Yang Chunxiang . Yrast Band and Four-Quasiparticle Band in Odd-Odd ¹⁶²Lu Nucleus. Chinese Physics C, 1997, 21(11): 970-975.
[15]	Huang Wenxue , Xu Xiaoji , Hu Zhiqiang , Ma Ruichang . First Experimental Determination of Half-Life for New Nuclide ⁶⁵Se. Chinese Physics C, 1996, 20(2): 113-118.
[16]	ZHU Sheng-Jiang . Research on Level Structures of Neutron-Rich Nuclei and Shape Phase Transitions Around A～100 and 150 Regions. Chinese Physics C, 1993, 17(4): 353-361.
[17]	SUN Xiang-Fu , WANG Ji-Cheng , GUO Ying-Xiang , LEI Xiang-Guo , LUO Yi-Xiao , YU Jian-Fang , XU Xiao-Ji , WEN Shu-Xian , WENG Pei-Kun , LI Sheng-Gang , YANG Chun-Xiang . Observation of New Levels in ¹²¹Cs. Chinese Physics C, 1992, 16(10): 938-942.
[18]	ZHU Sheng-Jiang , MA Wen-Chao . LEVEL STRUCTURE OF ¹⁵³Dy IN HIGH SPIN STATES AND SHAPE CHANGES WITH N AND I IN Dy NUCLEI. Chinese Physics C, 1990, 14(12): 1103-1109.
[19]	XU Xiao-Ji . THE POSSIBILITY OF EXITENCE OF NEW ISOTOPE ⁶⁵Se. Chinese Physics C, 1989, 13(2): 156-163.
[20]	CHANG HSI-CHEN . LEVEL DENSITY JUST ABOVE YRAST LINE. Chinese Physics C, 1978, 2(4): 374-377.

Access

Get Citation

SHEN Shui-Fa, LI Yan and GU Jia-Hui. New Low-spin Levels in ⁷⁶Se and Discussion of Its Yrast Band Structure[J]. Chinese Physics C, 2005, 29(2): 139-146.

SHEN Shui-Fa, LI Yan and GU Jia-Hui. New Low-spin Levels in ⁷⁶Se and Discussion of Its Yrast Band Structure[J]. Chinese Physics C, 2005, 29(2): 139-146. shu

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2004-05-18
Revised: 1900-01-01

Article Metric

Article Views(1402)
PDF Downloads(599)
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

New Low-spin Levels in ⁷⁶Se and Discussion of Its Yrast Band Structure

Corresponding author: SHEN Shui-Fa,

Shanghai Institute of Applied Physics,the Chinese Academy of Sciences,Shanghai 201800,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100049,China

Received Date: 2004-05-18

Accepted Date: 1900-01-01

Available Online: 2005-02-05

Abstract: The decay of bromine–76 was studied using compton–suppressed spectrometer and high–purity ge detectors in singles and coincidence mode, respectively. bromine–76 was produced via two reactions,i. e.,⁷⁵As(α,3n)⁷⁶Br and ⁷⁶Se(p, n)⁷⁶Br.the results of these experiments verified the previously reported levels and gammas of ⁷⁶Se. in addition to the previously described transitions and levels, 39 new γ–rays and 15 new energy levels were found for the first time. spins and parities for new levels are proposed based on the calculated logft values, de–excitation modes of the observed states, and some nuclear reaction experiment results. a new decay scheme of ⁷⁶Br is proposed in the present work. combining with the high–spin states observed by the in–beam γ–ray spectroscopy of a previous decay work, the positive–parity yrast states were compared with the results from calculations in the framework of the projected shell model.

HTML

Reference (1)

New Low-spin Levels in ⁷⁶Se and Discussion of Its Yrast Band Structure

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article

New Low-spin Levels in ⁷⁶Se and Discussion of Its Yrast Band Structure

Corresponding author: SHEN Shui-Fa,

HTML

目录

New Low-spin Levels in 76Se and Discussion of Its Yrast Band Structure

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article

New Low-spin Levels in 76Se and Discussion of Its Yrast Band Structure

Corresponding author: SHEN Shui-Fa,

HTML

目录

New Low-spin Levels in ⁷⁶Se and Discussion of Its Yrast Band Structure

New Low-spin Levels in ⁷⁶Se and Discussion of Its Yrast Band Structure