Angular distributions and energy spectra of fragments formed in the interaction of sup 238 U with 400-GeV protons

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5845100

Klingensmith, D L

Angular distributions and differential ranges at five angles to the beam have been measured for 23 fragments, ranging from {sup 47}C a to {sup 143}Ce, produced in the interaction of {sup 238}U with 400 GeV protons. The angular distributions have been characterized by the two model independent parameters, A{sub 1} and A{sub 2}, which determine the asymmetry and anisotropy, respectively. The normalized angular distributions (differential crow sections) have been used to normalize the energy spectra obtained from the data to yield values for the double differential cross section. The energy spectra show evidence for the presence of two components, which can be attributed to deep spallation and to fragmentation or fission. The spectra have been compared with a thermal model, used to test the two-step model of high-energy reactions, subjected to an invariant cross section analysis, and compared with the predictions of the Hufner fast breakup model. The energetic component was fit with a thermal fragment emission model and was found to be consistent with binary fission and, for the lightest products, with fragmentation. The formation of most products was determined to be inconsistent with the two-step model. An invariant cross section analysis of the high-energy component suggests that peaks at sideward angles reflect the intrinsic angular distributions. Physical parameters calculated from the data with the fast breakup model were within expected ranges, with the exceptions of the width of the spray particle momentum distribution and the Coulomb angle.

• Research Organization: Purdue Univ., Lafayette, IN (USA)
• OSTI ID: 5845100
• Country of Publication: United States
• Language: English

Related Subjects

652020* -- Nuclear Properties & Reactions
A=220 & above
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ANGULAR DISTRIBUTION
ANISOTROPY
ASYMMETRY
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BREAKUP REACTIONS
CALCIUM 47
CALCIUM ISOTOPES
CERIUM 143
CERIUM ISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ENERGY RANGE
ENERGY SPECTRA
EVEN-ODD NUCLEI
FISSION
GEV RANGE
GEV RANGE 100-1000
HADRON REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
KINETICS
MATHEMATICAL MODELS
NUCLEAR FRAGMENTATION
NUCLEAR FRAGMENTS
NUCLEAR MODELS
NUCLEAR REACTION KINETICS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PROTON REACTIONS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
REACTION KINETICS
SPALLATION
SPECTRA
TARGETS
URANIUM 238 TARGET