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Excitation and photon decay of giant resonances excited by intermediate energy heavy ions

Conference ·
OSTI ID:5508082
;
Inelastic scattering of medium energy heavy ions provides very large cross sections and peak-to-continuum ratios for excitation of giant resonances. For energies above about 50 MeV/nucleon, giant resonances are excited primarily through Coulomb excitation, which is indifferent to isospin, thus providing a good probe for the study of isovector giant resonances. The extremely large cross sections available from heavy ion excitation permit the study of rare decay modes of the giant resonances. In particular, recent measurements have been made of the photon decay of giant resonances following excitation by 22 and 84 MeV/nucleon /sup 17/O projectiles. The singles results at 84 MeV/nucleon yield peak cross sections for the isoscalar giant quadrupole resonance and the isovector giant dipole resonance of approximately 0.8 and 3 barns/sr, respectively. Data on the ground state decay of the isoscalar giant quadrupole and isovector giant dipole resonances are presented and compared with calculations. Decays to low-lying excited states are also discussed. Preliminary results from an experiment to isolate the /sup 208/Pb isovector quadrupole resonance using its gamma decay are presented. 22 refs., 19 figs., 1 tab.
Research Organization:
Oak Ridge National Lab., TN (USA)
DOE Contract Number:
AC05-84OR21400
OSTI ID:
5508082
Report Number(s):
CONF-871243-2; ON: DE88004171
Country of Publication:
United States
Language:
English

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Related Subjects

651100 -- Nuclear Physics-- Experimental Techniques-- (1980-)
651920* -- Nuclear Properties & Reactions
A=190-219
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
ANGULAR DISTRIBUTION
BARYON REACTIONS
BRANCHING RATIO
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
CORRELATIONS
COULOMB EXCITATION
CROSS SECTIONS
DATA
DISTRIBUTION
E1-TRANSITIONS
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
GAMMA RADIATION
GIANT RESONANCE
HADRON REACTIONS
HEAVY ION REACTIONS
HEAVY IONS
INELASTIC SCATTERING
INFORMATION
IONIZING RADIATIONS
IONS
ISOVECTORS
LEAD 208 TARGET
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
OXYGEN 17 REACTIONS
PROTON REACTIONS
RADIATIONS
RADIATIVE DECAY
RESONANCE
SCATTERING
SPECTRA
TARGETS
TENSORS
VECTORS