Angular and energy distributions of /sup 24/Na fragments formed by the reaction of 11. 5-GeV protons with /sup 197/Au

Journal Article · Sat Mar 01 04:00:00 EST 1980 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.21.1048· OSTI ID:5679602

Urbon, J A; Kaufman, S B; Henderson, D J; Steinberg, E P

The angular distribution and the range distributions at three angles have been measured for the light nuclear fragment /sup 24/Na formed by the interaction of 11.5-GeV protons with /sup 197/Au. The angular distribution has a peak at a laboratory angle theta/sub L/=70/sup 0/ and is thus quite different from the forward-peaked angular distribution previously observed for /sup 24/Na at a bombarding energy of 2.9 GeV. The velocity distributions derived from the range distributions are relatively narrow, and the mean velocity decreases from 2.11 (MeV/A)/sup 1/2/ at theta/sub L/=30/sup 0/ to 1.86 (MeV/A)/sup 1/2/ at 156.5/sup 0/. The data are analyzed in terms of the two-step model of nuclear reactions and are found to be consistent with that model. The model parameters derived from this analysis are =0.14 (MeV/A)/sup 1/2/ and =2.00 (MeV/A)/sup 1/2/. The angular distribution in the frame moving with the velocity v/sub parallel/ is found to be symmetric about 90/sup 0/, with an intensity ratio I (90/sup 0/)/I (0/sup 0/) =1.43. The implications of this analysis for the reaction mechanism are discussed.

• Research Organization: Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 5679602
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651925* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
DISTRIBUTION
ENERGY
ENERGY RANGE
ENERGY SPECTRA
FRAGMENTATION
GEV RANGE
GEV RANGE 10-100
GOLD 197 TARGET
HADRON REACTIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KINETIC ENERGY
KINETICS
LIGHT NUCLEI
NUCLEAR REACTION KINETICS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-ODD NUCLEI
PROTON REACTIONS
RADIOISOTOPES
RANGE
REACTION KINETICS
SECONDS LIVING RADIOISOTOPES
SODIUM 24
SODIUM ISOTOPES
SPALLATION
SPECTRA
TARGETS