Formation and decay of hot nuclei in {sup 63}Cu+{sup 197}Au AT 35 A MeV

Conference · Fri Dec 01 04:00:00 EST 1995

OSTI ID:126661

Wada, R; Hagel, K; Tezkratt, R ^[1]

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1. Texas A&M Univ., College Station, TX (United States); and others

Significant cross sections of heavy residues, associated with a high neutron multiplicity, are observed at {theta} = 6{degrees} in the reaction of {sup 63}Cu + {sup 197}Au at 35 A MeV. These residues have a mass {approximately}150-200 and a velocity {approximately}0.5-1.5cm/ns. When the velocity decreases from 1.5 to 0.5cm/ns, the residue mass increases and the associated neutron multiplicity decreases. These observations are consistent with a picture of an incomplete fusion reaction followed by particle evaporation. According to this scenario, the code EUGENE or QMD is used for modeling the incomplete fusion part and GEMINI is used as an after burner. When a dynamical fission delay is employed, using an experimentally derived scission time scale, heavy fragments are produced as evaporation residues in which the primary compound nuclei have a mass 250 {approximately} 260 and excitation energies of 1 {approximately} 1.5GeV. On the other hand this fission delay suppresses the symmetric fission decay significantly and may underestimate the fission-like products with mass {approximately}75-100 at {theta} = 6{degrees}.

• OSTI ID: 126661
• Report Number(s): CONF-950402--
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
99 GENERAL AND MISCELLANEOUS
COMPOUND NUCLEI
COPPER 63 REACTIONS
CROSS SECTIONS
E CODES
EVAPORATION
EXCITATION
GOLD 197 REACTIONS
HEAVY ION FUSION REACTIONS
HOT NUCLEI
MASS
MULTIPLICITY
NUCLEAR FRAGMENTS
RESIDUES
VELOCITY