Radioactive decay of mass-separated /sup 192/Tl and /sup 192/Pb

Journal Article · Sun Nov 01 04:00:00 EST 1981 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.24.2245· OSTI ID:6104447

Sousa, D C; Riedinger, L L; Bingham, C R; Turner, F E; Toth, K S; Carter, H K; Mledkodaj, R L; Spejewski, E H

Mass separated radioactive sources of /sup 192/Tl and /sup 192/Pb were produced using an isotope separator connected on-line to a cyclotron. Gamma-ray multiscale spectra and electron singles spectra were acquired and ..gamma..-..gamma.. and (x-ray)-..gamma.. coincidence measurements were. Half-lives of the 2/sup -/ and 7/sup +/ thallium isomers were determined to be 9.4 +- 0.2 and 10.8 +- 0.3 min, respectively. The 7/sup +/ isomer decays primarily to a group of negative-parity states built upon a 5/sup -/ state at 1843.9 keV in /sup 192/Hg. This structure has been interpreted as a two-neutron band involving i/sub 13/2/ and low-j neutrons. The decay of the 2/sup -/ isomer populates the low-lying positive-parity states in /sup 192/Hg in addition to a number of states in the region of 1--2.5 MeV; the properties of the six lowest positive-parity states are compatible with the triaxial-rotor predictions for ..gamma..approx.37/sup 0/, a value which also reproduces the structure of bands in adjacent odd-A nuclei. The /sup 192/Pb decay to /sup 192/Tl is found to have a half-life of 3.5 +- 0.1 min, rather than 2.2 min as reported by previous investigators. Most of the /sup 192/Pb decays proceeds to levels at 167.5 and 1195.4 keV, assigned I/sup ..pi../ = 1/sup -/ and 1/sup +/, respectively. The systematic variation of the 1/sup +/ state in even-A Tl and Au nuclei is discussed in light of the trend of the h/sub 11/2/ proton state in odd-A Tl and Au isotopes.

• Research Organization: Physics Department, University of Tennessee, Knoxville, Tennessee 37916
• OSTI ID: 6104447
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 24:5; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651922 -- Nuclear Properties & Reactions
A=190-219
Experimental-- Radioactive Decay-- (-1987)
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
DECAY
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
FT VALUE
GAMMA SPECTRA
HALF-LIFE
HEAVY ION REACTIONS
HEAVY NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEAD 192
LEAD ISOTOPES
METALS
MEV RANGE
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
MULTIPOLES
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
OXYGEN 16 REACTIONS
PARITY
PARTICLE PROPERTIES
RADIOISOTOPES
REFRACTORY METALS
SPECTRA
SPIN
TANTALUM
THALLIUM 192
THALLIUM ISOTOPES
TRANSITION ELEMENTS
TUNGSTEN