(Studies of target fragmentation in intermediate energy, relativistic and ultra-relativistic nuclear collisions)

Technical Report · Thu Aug 01 00:00:00 EDT 1991

DOI:https://doi.org/10.2172/6105325· OSTI ID:6105325

Loveland, W D

The work described herein is part of a project involving the study of low energy (< 10 MeV/A), intermediate energy (10--100 MeV/A) and relativistic (> 250 MeV/A) heavy ion reactions. In the low energy regime, we published a monograph on the properties of the heaviest elements and used that publication as a basis for making a set of best'' semi-empirical predictions of heavy element decay properties. The intermediate energy research effort focussed upon the completion of studies already begun and the initiation of a number of new experiments. In our study of a interaction of 21 MeV/nucleon {sup 129}Xe with {sup 197}Au, we compared the characteristics of the observed deep inelastic phenomena with various models of dissipative reactions and found significant discrepancies between observations and predictions. These discrepancies seemed to be caused by an improper treatment of pre-equilibrium in the early stages of the collision. In our study of the relativistic interaction of 400 MeV/nucleon {sup 12}C with {sup 197}Au, we reported the first direct physical measurement of the properties of the spallation residues from a nucleus-nucleus collision. We found the residue energies to be much lower than those predicted by the intranuclear cascade model, indicating some substantial modifications of that model are needed. But, we also found, indications of significant, non-zero values of the residue transverse momentum, a finding that calls into question the interpretation of a number of radiochemical recoil studies of the kinematics of high energy reactions. A program of performing numerical simulations of intermediate and high energy nuclear collisions using the QMD model was initiated.

• Research Organization: Oregon State Univ., Corvallis, OR (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG06-88ER40402
• OSTI ID: 6105325
• Report Number(s): DOE/ER/40402-4; ON: DE92004393
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COLLISIONS
COMPUTERIZED SIMULATION
HEAVY ION REACTIONS
NUCLEAR FRAGMENTATION
CARBON 12 REACTIONS
DEEP INELASTIC SCATTERING
GOLD 197 TARGET
HELIUM 3 REACTIONS
OXYGEN 16 REACTIONS
PROGRESS REPORT
RADIOCHEMICAL ANALYSIS
SAMARIUM 154 TARGET
SPALLATION
TIME-OF-FLIGHT METHOD
XENON 129 REACTIONS
CHARGED-PARTICLE REACTIONS
CHEMICAL ANALYSIS
DOCUMENT TYPES
INELASTIC SCATTERING
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
SIMULATION
TARGETS
400702* - Radiochemistry &amp; Nuclear Chemistry- Properties of Radioactive Materials
663000 - Nuclear Physics- (1992-)