In-beam gamma-ray studies of high-spin isomeric states in /sup 205/Tl and /sup 206/Hg

Technical Report · Sun Aug 01 04:00:00 EDT 1982

OSTI ID:6900025

Ussery, L E

The region of nuclei near /sup 208/Pb provide a good proving ground for the nuclear shell model. One of the most interesting features of nuclei in this and other closed shell regions is the existence of high-spin, long-lived isomeric states. Such states allow for a detailed study of the nature of the nucleons composing the nucleus and the forces which bind these nucleons together. In the present study two such nuclear isomers have been studied (one in /sup 205/Tl and one in /sup 206/Hg) using the techniques of in-beam gamma-ray spectroscopy in conjunction with the nuclear reactions /sup 204/Hg(t,2n..gamma..)/sup 205/Tl and /sup 204/Hg(t,p..gamma..)/sup 206/Hg. One of these nuclear isomers, a J/sup pi/ = 25/2+ state in /sup 205/Tl, had been observed in a previous study but the decay scheme was only partially correct. In the present study the decay scheme was corrected and the gyromagnetic ratio of the isomeric state was measured. From this gyromagnetic ratio measurement the gyromagnetic ratio was determined for a proton in the 1h/sub 11/2/ proton orbital and the anomalous orbital contribution deltag/sub l/. This measurement was then used with a previous measurement for the h/sub 9/2/ proton orbital to deduce the orbital gyromagnetic ratio for an h orbital. The isomer in /sup 206/Hg was observed for the first time in the present study. The decay scheme of the isomer was deduced and the isomeric state was determined to have a spin and parity of 5-. The gyromagnetic ratio was also measured for this isomeric state. With this measurement it was possible, using the results from the /sup 205/Tl study, to deduce the spin gyromagnetic ratio for a proton in the 3s proton orbital. (WHK)

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6900025
• Report Number(s): UCRL-53357; ON: DE83004361
• Country of Publication: United States
• Language: English

Related Subjects

651923* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
DATA
DIRECT REACTIONS
DISTRIBUTION
ENERGY LEVELS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
GAMMA SPECTRA
GYROMAGNETIC RATIO
HEAVY NUCLEI
HIGH SPIN STATES
IN-BEAM SPECTROSCOPY
INFORMATION
ISOMERIC NUCLEI
ISOTOPES
MAGNETIC MOMENTS
MATHEMATICAL MODELS
MERCURY 204 TARGET
MERCURY 206
MERCURY ISOTOPES
MINUTES LIVING RADIOISOTOPES
MULTIPOLARITY
NUCLEAR MAGNETIC MOMENTS
NUCLEAR MODELS
NUCLEAR PROPERTIES
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
RADIOISOTOPES
SHELL MODELS
SPECTRA
SPECTROSCOPY
SPIN
STABLE ISOTOPES
STRIPPING
TARGETS
THALLIUM 205
THALLIUM ISOTOPES
TRANSFER REACTIONS
TRITON REACTIONS