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

Abstract

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) 2000more » The American Physical Society.« less

Authors:
 [1];  [2];  [1];  [1];  [3];  [1];  [1];  [1];  [4];  [1];  [1];  [1];  [1]
  1. A.W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520 (United States)
  2. (Germany)
  3. (United States)
  4. (Romania)
Publication Date:
OSTI Identifier:
20216927
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; THORIUM 232 TARGET; OXYGEN 16 REACTIONS; VIBRATIONAL STATES; ENERGY LEVELS; COULOMB EXCITATION; GAMMA SPECTRA; EXCITED STATES; EXPERIMENTAL DATA

Citation Formats

Guenther, C., Institut fuer Strahlen- und Kernphysik, Universitaet Bonn, D-53115 Bonn,, Kruecken, R., Barton, C. J., Clark University, Worcester, Massachusetts 10610, Beausang, C. W., Casten, R. F., Cata-Danil, Gh., Horia Hulubei National Insitute of Physics and Nuclear Engineering, Bucharest,, Cooper, J. R., Groeger, J., Novak, J., and Zamfir, N. V. Coulomb excitation of vibrational states in {sup 232}Th with {sup 16}O projectiles. United States: N. p., 2000. Web. doi:10.1103/PhysRevC.61.064602.
Guenther, C., Institut fuer Strahlen- und Kernphysik, Universitaet Bonn, D-53115 Bonn,, Kruecken, R., Barton, C. J., Clark University, Worcester, Massachusetts 10610, Beausang, C. W., Casten, R. F., Cata-Danil, Gh., Horia Hulubei National Insitute of Physics and Nuclear Engineering, Bucharest,, Cooper, J. R., Groeger, J., Novak, J., & Zamfir, N. V. Coulomb excitation of vibrational states in {sup 232}Th with {sup 16}O projectiles. United States. doi:10.1103/PhysRevC.61.064602.
Guenther, C., Institut fuer Strahlen- und Kernphysik, Universitaet Bonn, D-53115 Bonn,, Kruecken, R., Barton, C. J., Clark University, Worcester, Massachusetts 10610, Beausang, C. W., Casten, R. F., Cata-Danil, Gh., Horia Hulubei National Insitute of Physics and Nuclear Engineering, Bucharest,, Cooper, J. R., Groeger, J., Novak, J., and Zamfir, N. V. Thu . "Coulomb excitation of vibrational states in {sup 232}Th with {sup 16}O projectiles". United States. doi:10.1103/PhysRevC.61.064602.
@article{osti_20216927,
title = {Coulomb excitation of vibrational states in {sup 232}Th with {sup 16}O projectiles},
author = {Guenther, C. and Institut fuer Strahlen- und Kernphysik, Universitaet Bonn, D-53115 Bonn, and Kruecken, R. and Barton, C. J. and Clark University, Worcester, Massachusetts 10610 and Beausang, C. W. and Casten, R. F. and Cata-Danil, Gh. and Horia Hulubei National Insitute of Physics and Nuclear Engineering, Bucharest, and Cooper, J. R. and Groeger, J. and Novak, J. and Zamfir, N. V.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.61.064602},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 61,
place = {United States},
year = {2000},
month = {6}
}