ENERGY DISTRIBUTIONS OF Li$sup 8$ FRAGMENTS EMITTED FROM C, Al, Cu, Ag, Au, AND U BOMBARDED BY 2.2-Bev PROTONS

Journal Article · Fri May 01 04:00:00 EDT 1959 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.114.905· OSTI ID:4225574

Katcoff, S

Targets of C, Al, Cus Ags Au, and U were irradiated with 2.2-Bev protons at the Brookhaven Cosmotron. The secondary fragments were collected in nuclear emulsions placed at various angles to the beam. From a study of the numbers and lengths of the hammer tracks, '' the energy distributions of the ejected Li/sup 8/ fragments were derived for each turget element at two or more angles. Analysis of the results, and comparison with evaporation calculations for Cu, Ag, and Au targets indicated the following: (1) in general, the observed spectra show considerably more high-energy Li/sup 8/ fragments than the calculated spectra; (2) the higher the fragment energy, the greater the tendency for emission in a forward direction; (3) from Ag, Au, and U targets, Li/sup 8/ may be ejected partially by an evaporation mechanism, but some other process must also play an important role; (4) for C, Al, and Cu targets, evaporation of Li/sup 8/ fragments from residual nuclei does not seem to be operating to any appreciable extent; (5) the Li/sup 8/ spectrum from Cu is surprising in that it lies higher in energy by several Mev than the Li/sup 8/ spectrum from Ag; (6) the spectrum of Li/sup 8/ from U is very similar to thai from Au and there is no evidence for emission of Li/sup 8/ fragments from excited fission products; (7) the cross section is estimated to increase monotonically from roughly one millibarn for Al to roughly ten millibarns for U. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• NSA Number: NSA-13-017274
• OSTI ID: 4225574
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 114; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALUMINUM
ANISOTROPY
CARBON
COLLECTIVE MODEL
COPPER
CROSS SECTIONS
ENERGY RANGE
EVAPORATION
EXCITATION
FISSION
FISSION PRODUCTS
GEV RANGE
GOLD
LITHIUM 8
MEASURED VALUES
NUCLEAR EMULSIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUMERICALS
PARTICLE TRACKS
PHYSICS AND MATHEMATICS
PROTON BEAMS
SILVER
SPECTRA
STATISTICS
SYNCHROTRONS
TARGETS
URANIUM