Evaporation residue cross sections for /sup 32/S+/sup 112,116,120,124/Sn from x-ray and direct recoil-nucleus measurements

Journal Article · Wed Feb 01 04:00:00 EST 1984 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.29.464· OSTI ID:6856010

Ernst, H; Henning, W; Davids, C N; Freeman, W S; Humanic, T J; Prosser, F W; Racca, R A

Evaporation residue cross sections have been measured for the systems /sup 32/S+/sup 112,116,120,124/Sn at incident energies between 130 MeV and 247 MeV. Total cross sections were measured by direct detection of recoil nuclei in a particle counter telescope. In addition, total and partial cross sections were determined from K-vacancy production cross sections and K x-ray multiplicities of the evaporation residues. The x-ray multiplicities are of the order of approx.1 and vary slowly with target mass and incident energy, indicating that x-ray detection can be reliably used to study fusion cross sections induced by heavy projectiles in this mass region. The total evaporation residue cross sections rise with increasing energy, saturate at approx.190-MeV incident energy, and decrease slightly at higher energies. The saturation value shows distinct differences between systems and ranges from approx.600 mb for /sup 32/S+ /sup 112/Sn to approx.800 mb for /sup 32/S+ /sup 124/Sn. The gross behavior of the partial evaporation residue cross sections is in agreement with statistical model calculations, but there remain deviations in the element distribution of the evaporation residues which might be explained by contributions from incomplete fusion reactions. As a byproduct we have measured K-vacancy production cross sections for atomic excitation of the target atoms by the projectiles and compared them with theoretical predictions.

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6856010
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 29:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651725* -- Nuclear Properties & Reactions
A=90-149
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ENERGY RANGE
EVAPORATION MODEL
FUSION REACTIONS
HEAVY ION REACTIONS
IONIZING RADIATIONS
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
MULTIPLICITY
NUCLEAR MODELS
NUCLEAR REACTIONS
RADIATIONS
RECOILS
STATISTICAL MODELS
SULFUR 32 REACTIONS
TARGETS
TIN 112 TARGET
TIN 116 TARGET
TIN 120 TARGET
TIN 124 TARGET
TOTAL CROSS SECTIONS
X RADIATION