Decay of mass-separated /sup 190/Tl and /sup 190/Hg

Journal Article · Fri Oct 01 00:00:00 EDT 1976 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.14.1586· OSTI ID:7147274

Bingham, C R; Riedinger, L L; Turner, F E; Kern, B D; Weil, J L; Hofstetter, K J; Lin, J; Zganjar, E F; Ramayya, A V; Hamilton, J H; Wood, J L; Gowdy, G M; Fink, R W; Spejewski, E H; Schmidt-Ott, W D; Mlekodaj, R L; Carter, H K; Sastry, K S.R.

Radioactive sources containing /sup 190/Tl and /sup 190/Hg have been produced and mass separated with the University Isotope Separator on line to the Oak Ridge isochronous cyclotron. Multiscaled spectra of ..gamma.. rays, x rays, conversion electrons, and positrons were obtained, and ..gamma..--..gamma.. and ..gamma..--x-ray coincidences were measured. Two isomers in /sup 190/Tl decay have half-lives of 2.6 +- 0.3 min (2/sup -/) and 3.7 +- 0.3 min (7/sup +/). From ..beta.. decay endpoint energies the 7/sup +/ and 2/sup -/ isomers lie within 0.1 MeV of each other, but which is the ground state was not determined. Both isomers have ground-state Q/sub EC/ values of approximately 7 MeV. The 2/sup -/ level undergoes ..beta.. decay primarily to the 2/sup +/ states at 416.4 and 1099.9 keV in /sup 190/Hg, while the decay of the 7/sup +/ isomer feeds a number of different states with spins ranging from 5 to 9. We observed the 5/sup -/, 7/sup -/, and 9/sup -/ members of the previously identified structure of negative-parity states resulting from coupling of a rotation-aligned i/sub 13///sub 2/ neutron with 3p/sub 3///sub 2/ and 2f/sub 5///sub 2/ neutrons. Some additional states having decays consistent with (6/sup -/) and (8/sup -/) assignments perhaps are candidates for less aligned members of the 13/2/sup +/ band coupled with p/sub 3///sub 2/ and f/sub 5///sub 2/ neutrons. The 20-min /sup 190/Hg isotope decays approximately 65% of the time to a level at 171.5 keV, thus making it difficult to study other levels in /sup 190/Au. Four new states in /sup 190/Au were definitely established, while several new ones were suggested by the present work. The populated levels are predominantly low spin and are fairly closely spaced. The log-ft value for the transition to the 171.5-keV level is 5.7, so it is likely that this state has a spin and parity of 1/sup +/. (AIP)

• Research Organization: Physics Department, University of Tennessee, Knoxville, Tennessee 37916
• OSTI ID: 7147274
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 14:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651922* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Radioactive Decay-- (-1987)
651923 -- Nuclear Properties & Reactions
A=190-219
Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BASIC INTERACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA SPECTRA
BETA-PLUS DECAY
BETA-PLUS DECAY RADIOISOTOPES
BRANCHING RATIO
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CONVERSION
DECAY
ELECTRON CAPTURE DECAY
ELECTRON CAPTURE RADIOISOTOPES
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
FERMIONS
FT VALUE
GAMMA SPECTRA
GOLD 190
GOLD ISOTOPES
HALF-LIFE
HEAVY ION REACTIONS
HEAVY NUCLEI
INTERACTIONS
INTERNAL CONVERSION
ISOMERIC NUCLEI
ISOTOPES
LEPTONIC DECAY
LEPTONS
MERCURY 190
MERCURY ISOTOPES
METALS
MEV RANGE
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
OXYGEN 16 REACTIONS
PARITY
PARTICLE DECAY
PARTICLE PROPERTIES
Q-VALUE
RADIOISOTOPES
REFRACTORY METALS
SPECTRA
SPIN
TANTALUM
THALLIUM 190
THALLIUM ISOTOPES
TRANSITION ELEMENTS
TUNGSTEN
WEAK INTERACTIONS
WEAK PARTICLE DECAY
X-RAY SPECTRA