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

Zhang Li; Wang Jicheng; Zhao Jinhua; Yang Yongfeng; Zheng Jiwen; Qin Zhi; Zhang Chun; Guo Tianrui

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

Abstract
HTML
Reference
Related

PDF

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.

[1]	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.
[2]	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.
[3]	LUO Jun-Hua , ZHOU Feng-Qun , KONG Xiang-Zhong . Cross-Section Measurements for Reactions on Platinum Isotopes in the Neutron Energy Range of 13.5 to 14.6MeV. Chinese Physics C, 2005, 29(6): 561-564.
[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]	ZHANG Tian-Jue . Design Method for ISOL′s Target System. Chinese Physics C, 2002, 26(3): 290-298.
[6]	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.
[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 Isotope ²³⁸Th. 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]	Guo Junsheng , Gan Zaiguo , Liu Hongye , Shi Lijun , Yang Weifan , Mou Wantong , Guo Tianrui , Fang Keming , Shen Shuifa , Yuan Shuanggui , Zhong Jiquan , Zhang Xueqian , Qin Zhi , Ma Ruichang , Wang Shuhong , Kong Dengming , Qiao Jimin . Synthesis and Identification of the New Transuranium Neutron-deficient Isotope ²³⁵Am. Chinese Physics C, 1996, 20(3): 286-288.
[11]	Wang Jicheng , Zhang Li , Guo Guanghui , Zhao Jinhua , Zheng Jiwen . Cross Section Measurements of Neutron-Rich Hg Isotopes in Reaction of 28MeV/u ¹⁸O 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 Nuclide ¹⁷⁵Er. 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 Isotope ²³⁹Pa. 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 Isotope ¹⁸⁹W Decay. Chinese Physics C, 1993, 17(11): 1055-1056.
[15]	XU Hu-Shan , JIANG Cheng-Lie , BAI Xi-Xiang . Preliminary Observation of Proton-rich Isotope ⁶⁵As. Chinese Physics C, 1992, 16(7): 647-650.
[16]	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 Isotope ²⁰⁸Hg. Chinese Physics C, 1992, 16(8): 767-768.
[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 ISOTOPES ⁵⁴Ti, ⁵⁶V, ⁵⁷V, ⁵⁸Cr PRODUCED IN BOMBARDMENT OF ⁵⁶Fe TARGET WITH 79OMeV ¹³⁶Xe IONS. Chinese Physics C, 1982, 6(4): 462-465.

Access

Get Citation

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.

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

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

Article Metric

Article Views(2981)
PDF Downloads(478)
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

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 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.

HTML

Reference (1)

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

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article