Strong evidence for quasifission in asymmetric reactions forming {sup 202}Po

Journal Article · Fri Feb 15 04:00:00 EST 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.024606· OSTI ID:21068133

Rafiei, R; Thomas, R G; Hinde, D J; Dasgupta, M; Morton, C R; Gasques, L R; Brown, M L; Rodriguez, M D ^[1]

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1. Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200 (Australia)

Fission fragment mass-angle correlations and mass ratio distributions have been measured for the reactions {sup 16}O+{sup 186}Os, {sup 24}Mg+{sup 178}Hf, {sup 34}S+{sup 168}Er, and {sup 48}Ti+{sup 154}Sm, forming the {sup 202}Po composite nucleus, at near barrier energies. Systematic analysis based on the expected dependence of the variance of the mass distribution on the angular momentum and temperature of the compound nucleus indicate that the two lighter systems evolve through true compound nucleus fission. Evidence of quasifission was observed for the two most mass-symmetric reactions, through strong mass-angle correlations for the {sup 48}Ti+{sup 154}Sm reaction and a broadened mass ratio distribution for the {sup 34}S+{sup 168}Er reaction. Furthermore, the increase in mass width at near barrier energies shows the influence of the alignment of statically deformed target nuclei.

• OSTI ID: 21068133
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 77; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
ASYMMETRY
COMPOUND NUCLEI
CORRELATIONS
ERBIUM 168
FISSION
FISSION FRAGMENTS
HAFNIUM 178
HEAVY ION FUSION REACTIONS
MAGNESIUM 24
MASS DISTRIBUTION
OSMIUM 186
OXYGEN 16
POLONIUM 202
QUASI-FISSION
SAMARIUM 154
TITANIUM 48