Quasi-fission

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:6045101

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Recent experimental and theoretical investigations have led to the characterization of a new reaction mechanism called quasi-fission. This process is characterized by the emergence of fission-like fragments, which do not originate from the fission decay of a compound nucleus formed by heavy-ion fusion, but rather from the break up of a short-lived intermediate complex. The occurrence of quasi-fission processes appear to be limited to heavy reaction systems and/or large angular momenta, although the present work demonstrates that such reactions occur for somewhat lighter projectiles than previously believed. It is thus shown that measurements of fragment angular distributions provide a signature for quasifission by being sensitive to whether or not a compound nucleus was formed during the reaction. From an analysis of such data it is concluded that the possibilities for synthesizing super-heavy elements in the range Z=112-116 are reduced considerably over previous estimates.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6045101
• Report Number(s): CONF-830469-3; ON: DE83011717
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
DISTRIBUTION
ELEMENTS
FISSION FRAGMENTS
FUSION REACTIONS
HEAVY ION REACTIONS
INTERMEDIATE STRUCTURE
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
QUASI-FISSION
TRANS 104 ELEMENTS
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS