Fission probes of sub-barrier fusion cross section enhancements and spin distribution broadening

Journal Article · Wed Oct 01 04:00:00 EDT 1986 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.34.1353· OSTI ID:5200432

Murakami, T; Sahm, C; Vandenbosch, R; Leach, D D; Ray, A; Murphy, M J

The mean-square spin value of the compound nucleus /sup 248/Cf has been determined from fission fragment angular distributions for the /sup 12/C+ /sup 236/U and /sup 16/O+ /sup 232/Th reactions at sub-barrier bombarding energies. The anisotropy and hence the mean-square spin values are much larger than predicted by models which reproduce the cross section enhancement observed in the sub-barrier fusion excitation functions. A similar experiment with the spherical target /sup 208/Pb also leads to larger anisotropies and mean-square spin values than predicted by various fusion models, including an especially complete coupled channels calculation. Supplementary fragment-fragment coincidence experiments have been performed with the heavier targets to confirm that the observed fission is associated with full momentum transfer. The mass distribution for the /sup 12/C+ /sup 236/U reaction has been measured at two angles and found to be independent of angle. This last result suggests that quasifission processes are not playing a significant role.

• Research Organization: Nuclear Physics Laboratory, University of Washington, Seattle, Washington 98195
• OSTI ID: 5200432
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 34:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

652026* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
CALIFORNIUM 248
CALIFORNIUM ISOTOPES
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
COUPLED CHANNEL THEORY
CROSS SECTIONS
DATA
DAYS LIVING RADIOISOTOPES
DEFORMED NUCLEI
DETECTION
DISTRIBUTION
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
EXPERIMENTAL DATA
FISSION FRAGMENT DETECTION
FUNCTIONS
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
HEAVY NUCLEI
INFORMATION
ISOTOPES
MASS SPECTRA
MEV RANGE
MEV RANGE 10-100
MULTIPLICITY
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
OXYGEN 16 REACTIONS
PARTICLE PROPERTIES
RADIATION DETECTION
RADIOISOTOPES
SPECTRA
SPIN
TARGETS
THORIUM 232 TARGET
URANIUM 236 TARGET