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COULOMB EXCITATION OF STATES IN Th$sup 232$ AND U$sup 23$$sup 8$

Journal Article · · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
;
The yield of gamma rays resulting from Coulomb excitation of states in Th/sup 232/ and U/sup 232/ with protons of 4- to 6-Mev ene rgy was measured. Gamma rays of 790-, 740-, and 613-kev eneray from Th/sup 232/ and of 1.02-Mev energy from U/sup 238/ were observed. For Th/sup 232/, the variation in gamma - ray yields with proton energy. the results from gamma -ray angular distributions, and the linear polarization measurements were consistent with the direct excitation of a 2+ state at 790-kev which decays by means of E2 radiation to the I = O+ and 2+ members of the ground-state rotational band. In view of the recent results from internal conversion electron measurements at Rice University. the 613-kev gamma ray was interpreted to be a transition from a 2+ BETA - vibrational state at 773 kev to the 4+ state at 183 kev. An interpretation of the observed gamma -ray yields was carried out taking a gamma -vibrational state at 790 kev and a BETA -vibrational state at 773 kev. The B(E2)/sub d/ of the 2+ state at 50 kev in Th/sup 232/ was about 150 times the single-particle estimate. The B(E2)/sub d/ of the vibrational states in Th/sup 232/ and U/sup 238/ were between 2 and 4 times the single-particle estimate. Combining Bernstein's relative internal conversion electron yields with the gamma -ray data, a value of (8 plus or minus 2) x 10/sup -2/ for the strength parameter p was obtained for the EO transition between the 2+ state at 773 kev and the 2+ state at 50 kev in Th/sup 233/. (auth)
Research Organization:
Oak Ridge National Lab., Tenn.
NSA Number:
NSA-15-005711
OSTI ID:
4112483
Journal Information:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 120; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ANGULAR DISTRIBUTION
DECAY
ELECTRONS
ENERGY LEVELS
GAMMA RADIATION
INTERNAL CONVERSION
MEASURED VALUES
PHYSICS
POLARIZATION
PROTONS
THORIUM
URANIUM