Thermal and angular momentum effects in the giant-dipole-resonance decay of hot rare-earth nuclei

Journal Article · Mon Apr 23 04:00:00 EDT 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.1999· OSTI ID:6847806

Morsch, H P; Spang, W ^[1]; Beene, J R; Bertrand, F E; Auble, R L; Charvet, J L; Halbert, M L; Hensley, D C; Lee, I Y; Varner, R L ^[2]; Sarantites, D G; Stracener, D W ^[3]

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1. Institut fuer Kernphysik, Kernforschungsanlage Juelich, D-5170 Juelich, (Federal Republic of Germany)
2. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (USA)
3. Washington University, St. Louis, Missouri 63130 (USA)

Recoil-{gamma} coincidences have been measured in the reaction {sup 16}O+{sup 159}Tb at beam energies of 300 and 400 MeV. In the {gamma}-ray spectra corresponding to excitation energies above 140 MeV a split giant dipole resonance is observed with widths substantially smaller than found at lower excitation energy. The possible influence of excitation energy and angular momentum on this effect is discussed. The intensity ratio of the two dipole resonance components is found to change with excitation energy, indicating a transition of the nuclear shape from prolate towards oblate.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6847806
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:17; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

651820* -- Nuclear Properties & Reactions
A=150-189
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
CHARGED-PARTICLE REACTIONS
DATA
DETECTION
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
GAMMA DETECTION
GIANT RESONANCE
HEAVY ION REACTIONS
INELASTIC SCATTERING
INFORMATION
MEV RANGE
MEV RANGE 100-1000
NUCLEAR REACTIONS
NUMERICAL DATA
OXYGEN 16 REACTIONS
RADIATION DETECTION
RESONANCE
SCATTERING
TARGETS
TERBIUM 159 TARGET
TIME-OF-FLIGHT METHOD