Oregon State University nuclear chemistry progress report, August 1, 1988--August 1, 1989

Technical Report · Tue Aug 01 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/5505745· OSTI ID:5505745

Loveland, W. D.

The work described herein is part of a project involving the study of intermediate energy, and relativistic heavy ion reactions. The intermediate energy research focused on the characterization of the heavy residues, the large target fragments with A{sub frag}>2/3 A{sub target}. For the reaction of 85 MeV/nucleon {sup 12}C with {sup 197}Au, we had measured the heavy residue yields and angular distributions previously. We report herein the measurement of their energy spectra. The average residue energies are quite low, ranging from 15 keV/nucleon to 314 keV/nucleon. These low energies imply errors in some previous measurements of heavy residues in that many residues have energies below counter thresholds, etc. The essential physics of heavy residue production is shown to be correctly described by a VUU calculation. For the reaction of 35 and 43 MeV/nucleon Kr with Au, we found the linear momenta of the near-target heavy residues to be in agreement with models of peripheral collisions. For the heavy residues with large {Delta}A values, the residue linear momenta approach a limiting value which is far below that expected from the universal'' systematics of linear momentum transfer in reactions induced by smaller projectiles. Reasons for this limiting behavior are suggested. In the area of relativistic nuclear collisions, complete target fragment mass distributions were measured for the ultrarelativistic reactions of 13.6 GeV/nucleon {sup 16}O and {sup 28}Si with {sup 197}Au. An unexpected finding in this study was the relatively large cross section for the two neutron removal process via electromagnetic dissociation. Similar measurements for the reaction of 1.1 GeV/nucleon {sup 197}Au with {sup 197}Au furnished the first complete fragment mass distribution for that reaction.

• Research Organization: Oregon State Univ., Corvallis, OR (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: FG06-88ER40402
• OSTI ID: 5505745
• Report Number(s): DOE/ER/40402-2; ON: DE90001177
• Country of Publication: United States
• Language: English

Related Subjects

651920* -- Nuclear Properties & Reactions
A=190-219
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
CHEMISTRY
DATA
DOCUMENT TYPES
ENERGY SPECTRA
EXPERIMENTAL DATA
FISSION FRAGMENTS
GOLD 197 REACTIONS
GOLD 197 TARGET
HEAVY ION REACTIONS
INFORMATION
MASS SPECTRA
MOMENTUM TRANSFER
NUCLEAR CHEMISTRY
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUMERICAL DATA
OXYGEN 16 REACTIONS
PROGRESS REPORT
SILICON 28 REACTIONS
SPECTRA
TARGETS