Chinese Physics C > 1997, Vol. 21 > Issue(10): 891-896

Detection of Weak γ-Activities of Neutron-Rich Isotopesin Element-Separated Sample

Institute of Modern Physics, The Chinese Academy of Sciences. Lanzhou 730000

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Abstract：
A new detection system was constructed by means of combination of a coincidence and an anticoincidence. The γ-ray energy signals detected by a HPGe detector were in coincidence with energy-loss signals of β rays detected by a 4πΔEβ detector, then the coincidence output were in anticoincidence with the positron-annihilating 511 keV γ signals detected by a large BGO detector. This system may reduces the Compote background for γ-spectrum measurement by about one order of magnitude. With strong suppression to the detection of the decaying γ rays from neutron-deficient isotopes, the detection of the decaying γ rays from neutron-rich isotopes can keep a higher efficiency of (46±3)% compared to single-spectrum measurement. This system was used for determining the half-life of the neutron-rich isotope ²⁰⁸Hg. A new value of 41.5 _-4.1 ^+5.0min was obtained, which is in agreement with the earlier value obtained by radiochemical milking method, but the measurement error was substantially improved.

References

[1]

张立,核物理动态，8(1991)7.[2]戴光曦等,核素图册,科学技术出版社重庆分社(1987).[3]王积成等,高能物理与核物理,19(1995)653.[4]梅镇岳,原子核物理,科学出版社(1961)[5]Table of Isotopi, 7th ed., Ediied by C. M. Lederer et al., Wiley, New York, 1978.[6]M. G. Porquet et al., Nucl. Phys., A411(1983)65.[7]Zhmg Li et al., Phys. Rev., C49(1994)R599.br[8]张立等，高能物理与核物理,18(1994)296.[9]Zhao Jinhua et al., Chin. J. of Nucl. Phys., 14(1992)267.[10]Zhao Jinhua et al., Annual Report of IMP., (1995) 150.

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[2]	HE Guo-Zhu,TUO Fei,KONG Xiang-Zhong. (n,2n),(n,p) and (n,α) Reactions Cross-Sections Measurement on Selenium Isotopes at Neutron Energy of 14MeV. Chinese Physics C, 2006, 30(9): 844-847.
[3]	DING Bin-Gang,ZHANG Da-Li,LU Ding-Hui. A new method to prove the closed shell of N=184 for the neutron-rich superheavy elements. Chinese Physics C, 2006, 30(4): 310-313.
[4]	HE Xiao-Tao,LIU Shu-Xin,YU Shao-Ying,ZENG Jin-Yan,ZHAO An-Guang. Identical Superdeformed Bands in Tl Isotope. Chinese Physics C, 2004, 28(S1): 36-39.
[5]	FAN Hong-Mei,WANG Tong-Qing,GUO Bin,GUO Ying-Xiang,ZHANG Li,ZHAO Jin-Hua. The Experimental Study for Increasing Efficiency of On-Line Isotope Separator. Chinese Physics C, 2002, 26(1): 69-73.
[6]	ZHANG Tian-Jue. Design Method for ISOL′s Target System. Chinese Physics C, 2002, 26(3): 290-298.
[7]	Xu Yanbing,Yuan Shuanggui,Yang Weifan,He Jianjun,Li Zongwei,Ma Taotao,Xiong Bing,Qin Zhi,Mou Wantong,Gan Zaiguo,Shi Lijun,Guo Tianrui,Chen Zhantu,Guo Junsheng. A New Heavy Neutron-rich Isotope²³⁸Th. Chinese Physics C, 1999, 23(1): 93-95.
[8]	Zhao Zhizheng,Yang Yongfeng,Zheng Zhaomiao,Zu Kailing,Wang Xudong,Cai Xichen,Shang Rencheng,Xu Sida,. The Element Selectivity and Laser Technique of the Laser Ion SourceUsed for On-line Isotope Separator. Chinese Physics C, 1998, 22(9): 844-852.
[9]	Yang Weifan,Yuan Shuanggui,Li Zongwei,He Jianjun,Ma Taotao,Fang Keming,Shen Shuifa,Gan Zaiguo,Pan Qiangyan,Mou Wantong,Su Denggui,Chen Zhantu,Guo Tianrui,Guo Junsheng,Liu Hongye,Shi Lijun,Zhao Zhizheng,Ma Huifang. A New Neu tron-rich Isotope:¹⁸⁶Hf. Chinese Physics C, 1997, 21(10): 958-959.
[10]	Wang Jicheng,Zhao Jinhua,Guo Guanghui,Yang Yongfeng,Zhang Li. 4π△E_βDetector and Its Application to Researching Neutron-Rich Nuclides. Chinese Physics C, 1995, 19(7): 653-657.
[11]	Wang Jicheng,Zhang Li,Guo Guanghui,Zhao Jinhua,Zheng Jiwen. Cross Section Measurements of Neutron-Rich Hg Isotopes in Reaction of 28MeV/u¹⁸O with Thick Natural Lead Target. Chinese Physics C, 1995, 19(8): 686-691.
[12]	Yang Weifan,Yuan Shuanggui,Zhang Xueqian,Yu Xian,Mou Wantong,Li Zongwei,Gan Zaiguo,Liu Hongye,Guo Junsheng,Zhong Jiquan,Sun Xiangfu. The Synthesis and γ Decay of New Heavy Neutron-Rich Nuclide¹⁷⁵Er. Chinese Physics C, 1995, 19(10): 959-960.
[13]	Yang Weifan,Yuan Shuanggui,Mou Wantong,Zhang Xueqian,Li Zongwei,Yu Xian,Gan Zaiguo,Liu Hongye,Guo Yingxiang,Zhao Jinhua,Lei Xiangguo,Guo Junsheng,Du Yifei,Zhao Lili,Zhang Xiang. A New Heavy Neutron-Rich Isotope²³⁹Pa. Chinese Physics C, 1995, 19(5): 479-480.
[14]	YANG Weifan,ZHAO Zhizheng,LI Zongwei,MOU Wantong,ZHU Shaofei,XIE Xiujun,YUAN Suanggui,ZHANG Tianmei,PAN Qiangyan,WANG Jicheng,XU Shuwei. New Gamma Rays from the Neutron-Rich Isotope¹⁸⁹W Decay. Chinese Physics C, 1993, 17(11): 1055-1056.
[15]	ZHANG Li,JIN Gen-Ming,ZHAO Jin-Hua,YANG Wei-Fan,YANG Yong-Feng,ZHAO Zhi-Zheng,ZHENG Ji-Wen,SUN Xiu-Rong,LI Zong-Wei,QIN Zhi,WANG Ji-Cheng,GUO Guang-Hui. New Neutron-Rich Isotope²⁰⁸Hg. Chinese Physics C, 1992, 16(8): 767-768.
[16]	XU Hu-Shan,JIANG Cheng-Lie,BAI Xi-Xiang. Preliminary Observation of Proton-rich Isotope⁶⁵As. Chinese Physics C, 1992, 16(7): 647-650.
[17]	FENG Jun,SHEN Wen-Qing,ZENG Yue-Wu,WANG Bing,MA Yu-Gang,ZHAN Wen-Long,ZHU Yong-Tai,FENG En-Pu. The Relation of Isotopic Distribution of Heavy Ion Peripheral Reaction Products to Neutron-Skin and Excitation Energy in Intermediate Energy Range. Chinese Physics C, 1991, 15(4): 322-328.
[18]	HUANG Ye-Cheng,WANG Tong-Qing,TAN Jin-Feng,GUO Bin,FAN Hong-Mei. A STATUS REPORT OF ISOLAN ——THE ON-LINE ISOTOPE SEPARATOR IN LANZHOU. Chinese Physics C, 1990, 14(1): 70-75.
[19]	ZHANG Jing-Ye,ZHONG Ji-Quan,JIAO Dun-Pang,GE Yuan-Xiu,MA Xi-Liang. ON THE νi_13/2PAIR IN EVEN Pt ISOTOPES. Chinese Physics C, 1987, 11(1): 128-132.
[20]	SHEN WEN-QING. NEUTRON RICH ISOTOPES⁵⁴Ti,⁵⁶V,⁵⁷V,⁵⁸Cr PRODUCED IN BOMBARDMENT OF⁵⁶Fe TARGET WITH 79OMeV¹³⁶Xe IONS. Chinese Physics C, 1982, 6(4): 462-465.

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Zhang Li, Wang Jicheng, Zhao Jinhua, Yang Yongfeng, Zheng Jiwen, Qin Zhi, Zhang Chun and Guo Tianrui. Detection of Weak γ-Activities of Neutron-Rich Isotopesin Element-Separated Sample[J]. Chinese Physics C, 1997, 21(10): 891-896.

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Received: 1900-01-01
Revised: 1900-01-01

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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

Detection of Weak γ-Activities of Neutron-Rich Isotopesin Element-Separated Sample

Corresponding author:Zhang Li,

Institute of Modern Physics, The Chinese Academy of Sciences. Lanzhou 730000

Received Date:1900-01-01

Accepted Date:1900-01-01

Available Online:1997-10-05

Abstract:A new detection system was constructed by means of combination of a coincidence and an anticoincidence. The γ-ray energy signals detected by a HPGe detector were in coincidence with energy-loss signals of β rays detected by a 4πΔEβ detector, then the coincidence output were in anticoincidence with the positron-annihilating 511 keV γ signals detected by a large BGO detector. This system may reduces the Compote background for γ-spectrum measurement by about one order of magnitude. With strong suppression to the detection of the decaying γ rays from neutron-deficient isotopes, the detection of the decaying γ rays from neutron-rich isotopes can keep a higher efficiency of (46±3)% compared to single-spectrum measurement. This system was used for determining the half-life of the neutron-rich isotope²⁰⁸Hg. A new value of 41.5_-4.1^+5.0min was obtained, which is in agreement with the earlier value obtained by radiochemical milking method, but the measurement error was substantially improved.

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Detection of Weak γ-Activities of Neutron-Rich Isotopesin Element-Separated Sample

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