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

Journal Article · Wed Oct 01 00:00:00 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), Vol. 34:4
• Country of Publication: United States
• Language: English

Related Subjects

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