STUDY OF A FRAGMENTATION REACTION BY THIN-TARGET RECOIL TECHNIQUES PRODUCTION OF Na$sup 24$ FROM BISMUTH BY 2.9-Gev PROTONS

Journal Article · Mon Apr 13 04:00:00 EST 1964 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

OSTI ID:4082120

Cumming, J B; Cross, Jr, R J; Hudis, J; Poskanzer, A M

The angular distribution of Na/sup 24/ nuclei produced by bombardment of thin bismuth targets with 2.9-Bev protons was measured. The forward-to-backward ratio in the laborator system was found to be 1.52 plus or minus 0.06. Differential range curves for the Na nuclei were obtained at angles of 15, 90, and 165 deg , with respect to the beam direction. The mean energy of emission at 90 deg is 47 Mev with a full width at half-maximum of 40 Mev. The mean is only 60% of the energy expected from Coulomb repulsion. Velocity spectra at 15 and 165 deg are nearly identical to the 90 deg spectrum linearly shifted by approximately 10% to higher and lower velocities, respectively. From the analysis of the angular distribution and the range data, it is concluded that there is no moving system in which both the angular distribution and velocity spectra of the Na/sup 24/ nuclei are symmetric about the direction perpendicular to the beam. This indicates that this typical fragmentation product is produced by a direct (rapid) process and not by the usual fast nucleonic cascade followed by a slower de-excitation step. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• NSA Number: NSA-18-015284
• OSTI ID: 4082120
• Report Number(s): BNL-7528; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 134; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
BISMUTH
CASCADES
DECAY
DIRECT REACTIONS
ELECTRIC FIELDS
EMISSION
ENERGY RANGE
EXTRACTION COLUMNS
GEV RANGE
MEASURED VALUES
NUCLEAR REACTIONS
NUCLEONS
PHYSICS
PRODUCTION
PROTON BEAMS
RECOILS
SCATTERING
SODIUM 24
SPECTRA
TARGETS
THICKNESS
VELOCITY