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Unexpected entrance channel effects in the decay of the compound nucleus /sup 156/Er

Journal Article · · Phys. Rev. Lett.; (United States)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Angular momentum distributions for the dominant decay channels of /sup 156/Er compound nuclei have been studied with the Darmstadt-Heidelberg ''crystal ball'' detector in nearly mass-symmetric (/sup 64/Ni+ /sup 92/Zr) and asymmetric (/sup 12/C+ /sup 144/Sm) entrance channels. Strong differences in the ..cap alpha..n-italic yield and 2n-italic/3n-italic cross-section ratios are observed at the same excitation energy (47 MeV) and spin in /sup 156/Er. This effect indicates that there is memory of the entrance channel during the particle-evaporation stage of the compound-nucleus decay. The dominant exit channels do not exhibit high-angular-momentum components.
Research Organization:
II. Physikalisches Institut, Universitaet Giessen, West Germany
OSTI ID:
5410598
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 56:22; ISSN PRLTA
Country of Publication:
United States
Language:
English

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Related Subjects

651723 -- Nuclear Properties & Reactions
A=90-149
Experimental-- Energy Levels & Transitions-- (-1987)
651725* -- Nuclear Properties & Reactions
A=90-149
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
DATA
DECAY
EMISSION
ERBIUM 156
ERBIUM ISOTOPES
EVAPORATION MODEL
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
GAMMA SPECTRA
HEAVY ION REACTIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MASS SPECTRA
MATHEMATICAL MODELS
MINUTES LIVING RADIOISOTOPES
NEUTRON EMISSION
NICKEL 64 REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
PARTICLE PROPERTIES
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SAMARIUM 144 TARGET
SPECTRA
SPIN
TARGETS
ZIRCONIUM 92 TARGET