Giant dipole resonance in highly excited thorium: Evidence for strong fission hindrance

Journal Article · Mon Dec 21 04:00:00 EST 1987 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.59.2860· OSTI ID:5507988

Thoennessen, M; Chakrabarty, D R; Herman, M G; Butsch, R; Paul, P

The giant dipole resonance in /sup 224/Th excited to 44, 64, and 82 MeV was observed following the fusion of /sup 16/O+ /sup 208/Pb. The total ..gamma.. spectrum is analyzed in terms of prefission and postfission ..gamma.. decay. The data can only be fitted by our requiring an enhancement of the giant dipole resonance ..gamma.. rays from the prefission nuclei which is explained by a large fission hindrance in the early decay steps from the compound system. A measurement of the ..gamma..-fission angular correlation supports this conclusion and establishes a deformed shape of the compound nucleus.

• Research Organization: Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794
• OSTI ID: 5507988
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 59:25; ISSN PRLTA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ANGULAR CORRELATION
CHARGED-PARTICLE REACTIONS
COMPOUND NUCLEI
CORRELATIONS
DEFORMED NUCLEI
DIPOLE MOMENTS
ENERGY RANGE
ENERGY SPECTRA
EVEN-EVEN NUCLEI
FISSION
GAMMA SPECTRA
GIANT RESONANCE
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
HEAVY NUCLEI
ISOTOPES
LEAD 208 TARGET
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR REACTIONS
NUCLEI
OXYGEN 16 REACTIONS
PROBABILITY
RADIOISOTOPES
RESONANCE
SECONDS LIVING RADIOISOTOPES
SPECTRA
STATISTICAL MODELS
TARGETS
THORIUM 224
THORIUM ISOTOPES