Coulomb excitation of vibrational states in {sup 232}Th with {sup 16}O projectiles

Journal Article · Thu Jun 01 04:00:00 EDT 2000 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.61.064602· OSTI ID:20216927

Guenther, C ^[1]; Kruecken, R ^[1]; Barton, C J ^[1]; Beausang, C W ^[1]; Casten, R F ^[1]; Cata-Danil, Gh ^[1]; Cooper, J R ^[1]; Groeger, J ^[1]; Novak, J ^[1]; Zamfir, N V ^[1]

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1. A.W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520 (United States)

Excited states in {sup 232}Th were populated by Coulomb excitation with 80 MeV {sup 16}O ions. Gamma-gamma coincidences were detected with the detector array YRAST Ball. The one-phonon quadrupole and octupole vibrations are most strongly excited. These vibrations are in {sup 232}Th, particularly favorable cases for a study of their couplings, due to the small energy spacings of the {beta} and {gamma} bands and the K{sup {pi}}=1{sup -} and 2{sup -} bands, respectively. The need for additional experimental information on the {gamma}-ray intensities and the location of members of the octupole-vibrational bands is emphasized. The higher-lying K{sup {pi}}=0{sup +} bands with bandheads at 1079 and 1352 keV proposed previously are observed and some conflicting properties of these bands are discussed. The interpretation of the 1352 keV 0{sup +} band as two-octupole-phonon vibration is not supported by our data. A level at 1054 keV, previously assigned as 2{sup +} or 2{sup -} level, is tentatively proposed to be the bandhead of a second-excited K{sup {pi}}=2{sup +} band. Our {gamma}{gamma} coincidence data establish that the unusually enhanced E2 transitions from a 2{sup +} level at 1554 keV to members of the {beta} and {gamma} bands proposed previously do not exist. (c) 2000 The American Physical Society.

• OSTI ID: 20216927
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 61; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COULOMB EXCITATION
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
GAMMA SPECTRA
OXYGEN 16 REACTIONS
THORIUM 232 TARGET
VIBRATIONAL STATES