OBSERVATION OF THE NEW NEUTRON-RICH NUCLIDE HG-208

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	OBSERVATION OF THE NEW NEUTRON-RICH NUCLIDE HG-208
	ZHAO, JH; YANG, WF; YANG, YF; ZHAO, ZZ; ZHENG, JW; SUN, XR; WANG, JC; ZHANG, JY; ZHANG, L; JIN, GM
刊名	PHYSICAL REVIEW C
	1994
卷号	49 期号:2 页码:R592-R596
ISSN号	0556-2813
通讯作者	ZHANG, L, ACAD SINICA,INST MODERN PHYS,LANZHOU 730000,PEOPLES R CHINA.
英文摘要	The new neutron-rich isotope 208Hg was observed for the first time in the reaction products from a thick (nat)Pb target bombarded by a 30 MeV/nucleon C-12 beam. A high efficiency release, separation, and collection of Hg products were of success with a good selectivity by using a special off-line gas-phase thermochromatographic process followed by a liquid-liquid procedure which was developed in the present work. The assignment of 208Hg was based on the identification of its beta- decay daughter Tl-208 observed in the periodically extracted Tl element sample growing in the separated Hg element product solution. In the gamma spectra of the TI samples a 2614.6-keV gamma activity with a half-life 191(+104/-50) s was observed, which could only be assigned to the daughter Tl-208 of 208Hg beta- decay. The measured 208Hg half-life was 42(+23/-12) min and the average production cross section for the energy of the C-12 beam ranging from 30 MeV/nucleon to 5 MeV/nucleon and the effective target thickness of 670 mg/cm2 was deduced to be 1.1(+1.0/-0.5) mub. Moreover, in the time-successive gamma spectra of the separated Hg sample, a 473.5-keV gamma activity corresponding to the gamma transition of 4+ to ground state (5+) of Tl-208 was observed and found to have the same half-life as the 208Hg beta- decay within the error range of the present work. A theoretical discussion for the obtained half-life of 208Hg is given.
WOS关键词	DECAY HALF-LIVES ; NUCLEI
WOS研究方向	Physics
语种	英语
出版者	AMERICAN PHYSICAL SOC
WOS记录号	WOS:A1994MZ10300005
公开日期	2011-08-26
内容类型	期刊论文
源URL	[http://ir.imp.cas.cn/handle/113462/10115]
专题	近代物理研究所_近代物理研究所知识存储（2010之前）
通讯作者	ZHANG, L
推荐引用方式 GB/T 7714	ZHAO, JH,YANG, WF,YANG, YF,et al. OBSERVATION OF THE NEW NEUTRON-RICH NUCLIDE HG-208[J]. PHYSICAL REVIEW C,1994,49(2):R592-R596.
APA	ZHAO, JH.,YANG, WF.,YANG, YF.,ZHAO, ZZ.,ZHENG, JW.,...&QIN, Z.(1994).OBSERVATION OF THE NEW NEUTRON-RICH NUCLIDE HG-208.PHYSICAL REVIEW C,49(2),R592-R596.
MLA	ZHAO, JH,et al."OBSERVATION OF THE NEW NEUTRON-RICH NUCLIDE HG-208".PHYSICAL REVIEW C 49.2(1994):R592-R596.