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.

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(3458)
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)

Link: IOPScience; SCOAP³; arXiv; Chinese Physical Society

Journal information: Introduction; Editorial Board; Others; Subscribe

Contact us: QQ: 1307685413; Tel: +86-010-88235947; Fax: +86-010-88233126; E-mail: cpc@ihep.ac.cn

CPC Website
IOP Website
CPC WeChat

Supported by: Beijing Renhe Information Technology Co. Ltd E-mail: info@rhhz.net

DownLoad: Full-Size Img PowerPoint

Return

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

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

Corresponding author: Zhang Li,

HTML

目录

[1]	LIU Chang-Long , LU Yi-Ying , YIN LI . Effects of Additional Vacancy-Like Defects Produced by Ion Impealations on Boron Thermal Diffusion in Silicon. Chinese Physics C, 2005, 29(11): 1107-1111.
[2]	Guo Hua . In-medium QMC Model Parameters and Quark Condensation in Nuclear Matter. Chinese Physics C, 1999, 23(5): 459-468.
[3]	BES Collaboration . Experimental Study of Resonance f₂(1270) in the J/ψ Hadronic Decay. Chinese Physics C, 1993, 17(2): 97-106.
[4]	Sa Ben-hao , Zhang Xi-zhen , Li Zhu-xia , Shi Yi-jin . A PRIMARY RESEARCH OF THE PHONON RENORMALIZATION OF NUCLEAR FIELD THEORY. Chinese Physics C, 1980, 4(3): 398-400.