Observation of the new neutron-rich nuclide [sup 208]Hg

Journal Article · Mon Jan 31 23:00:00 EST 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.49.R592· OSTI ID:5263653

Li, Z; Genming, J; Jinhua, Z; Weifan, Y; Yongfeng, Y; Zhizheng, Z; Jiwen, Z; Xiurong, S; Jicheng, W; Zongwei, L; Zhi, Q; Guanghui, G; Yixiao, L; Zylicz, J; Zhang, J ^[1]

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1. Institute of Modern Physics, Academia Sinica, Lanzhou 730 000 (China)

The new neutron-rich isotope [sup 208]Hg was observed for the first time in the reaction products from a thick [sup nat]Pb target bombarded by a 30 MeV/nucleon [sup 12]C 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 [sup 208]Hg was based on the identification of its [beta][sup [minus]] decay daughter [sup 208]Tl observed in the periodically extracted Tl element sample growing in the separated Hg element product solution. In the [gamma] spectra of the Tl samples a 2614.6-keV [gamma] activity with a half-life 191[sub [minus]50][sup +104] s was observed, which could only be assigned to the daughter [sup 208]Tl of [sup 208]Hg [beta][sup [minus]] decay. The measured [sup 208]Hg half-life was 42[sub [minus]12][sup +23] min and the average production cross section for the energy of the [sup 12]C beam ranging from 30 MeV/nucleon to 5 MeV/nucleon and the effective target thickness of 670 mg/cm[sup 2] was deduced to be 1.1[sub [minus]0.5][sup +1.0] [mu]b. 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[sup +] to ground state (5[sup +]) of [sup 208]Tl was observed and found to have the same half-life as the [sup 208]Hg [beta][sup [minus]] decay within the error range of the present work. A theoretical discussion for the obtained half-life of [sup 208]Hg is given.

• OSTI ID: 5263653
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 49:2; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663110* -- General & Average Properties of Nuclei & Nuclear Energy Levels-- (1992-)
663210 -- Ground-State Radioactivity-- (1992-)
663450 -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663580 -- Nuclear Mass Ranges-- A=190-219-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DECAY
EVEN-EVEN NUCLEI
GAMMA SPECTRA
HALF-LIFE
HEAVY ION REACTIONS
HEAVY NUCLEI
INTEGRAL CROSS SECTIONS
ISOTOPES
LEAD 208 TARGET
MERCURY 208
MERCURY ISOTOPES
MINUTES LIVING RADIOISOTOPES
NEUTRON-RICH ISOTOPES
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
SPECTRA
TARGETS
THALLIUM 208
THALLIUM ISOTOPES
YEARS LIVING RADIOISOTOPES