SOME CHARACTERISTICS OF THE FORMATION OF LITHIUM-8 BY THE INTERACTION OF 660-Mev PROTONS WITH $sub 6$$C$$sup 12$ NUCLEI

Journal Article · Thu Aug 01 00:00:00 EDT 1963 · Doklady Akademii Nauk SSSR (U.S.S.R.) English translation currently published in a number of subject-oriented journals

OSTI ID:4646189

Lozhkin, O V; Perfilov, N A; Yakovlev, Yu P

Formation of fast particles carrying multiple charges by the splitting of light nuclei by high-energy protons is of great interest for the theory of direct interactions, therefore, the angular distribution and the energy spectra of /sub 3/Li/sup 8/ fragments, emitted at various angles with respect to the incident protons were investigated for the case involving the splitting of the / sub 6/C/sup 12/ nucleus. Thin polystyrene and polyethylene films were exposed in a vacuum chamber to a 10/sup 13/ cm/sup -2/ proton flux in the extracted beam of the Joint Institute for Nuclear Studies phasotron, using a proton energy of 660 Mev. The Li/sup 8/ fragments were recorded by means of a low-sensitivity nuclear emulsion in the angular range from 20 to 160 deg . Results revealed the formation of T-shaped tracks which in principle could be formed by clei at 20, 47, 90, and 137 deg . They were due mostly to /sub 3/Li/sup 8/ and to a slight degree to /sub 3/Li/sup 9/, the i sobar /sub 5/B/sup 8/ was absent. This indicated a substantially asymmetric structure of /sub 6/C/sup 12/ in relation with the mirror symmetry of the /sub 5/B/sup 8/ and /sub 3/Li/sup 8/ cluster. While this supports the assump tion that the incident protons split the clusters quasi-elastically, it is contradicted by the energy measurements as a function of the angle of observation and the energy of the incident particles. It was concluded that the softest portion of the /sub 3/Li/sup 8/ spectrum is due to the formation by an (n,2n) reaction of an intermediate /sub 4/Be/sup 9/ particle and to the decay of the residual nucleus. (TTT)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-038103
• OSTI ID: 4646189
• Journal Information: Doklady Akademii Nauk SSSR (U.S.S.R.) English translation currently published in a number of subject-oriented journals, Vol. Vol: 151; Other Information: Orig. Receipt Date: 31-DEC-63
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

PHYSICS
ANGULAR DISTRIBUTION
BERYLLIUM 9
BORON 8
CARBON 12
CLUSTER MODEL
CYCLOTRONS
DECAY
DIRECT REACTIONS
ELECTRIC CHARGES
ELEMENTARY PARTICLES
ENERGY
FILMS
INTERACTIONS
LITHIUM 8
LITHIUM 9
MEASURED VALUES
MEV RANGE
NUCLEAR EMULSIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
PARTICLE TRACKS
POLYESTERS
POLYETHYLENES
PREPARATION
PROTON BEAMS
RECORDING SYSTEMS
SENSITIVITY
SYNCHROTRONS