Structure functions of /sup 12/C, /sup 63/Cu, and /sup 208/Pb nuclei in photoproduction of cumulative protons

Journal Article · Fri Feb 01 04:00:00 EST 1985 · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)

OSTI ID:5262556

Alanakyan, K V; Amaryan, M D; Demirchyan, R A; Egiyan, K S; Kocharova, Z L; Ogandzhanyan, M S; Stepanyan, S G; Sharabyan, Y G

Results are reported of an investigation of the structure functions f(..cap alpha.., p/sub perpendicular/) of the nuclei /sup 12/C, /sup 63/Cu, and /sup 208/Pb in the course of photoproduction of cumulative protons at E/sup max//sub ..gamma../ = 4.5 GeV. It is shown that for /sup 12/C nuclei (K. Sh. Egiyan et al., Sov. J. Nucl. Phys. 37, 730 (1983); Report 525(12), Erevan Phys. Inst., 1982) as well as for /sup 63/Cu and /sup 208/Pb the function f(..cap alpha../sub 1/ p/sub perpendicular/) can be represented as the product f/sub 1/(..cap alpha..)f/sub 2/(p/sub perpendicular/), with f(..cap alpha..)approx.exp(-..cap alpha../..cap alpha../sub 0/). The parameter ..cap alpha../sub 0/ determined in the region ..cap alpha..>1.5 is equal to 0.134 +- 0.01 and is independent of p/sub perpendicular/ at p/sub perpendicular/> or =0.5 GeV/c, but tends to increase with A. The ratio R/sub A//C = f/sub A/(..cap alpha.., p/sub perpendicular/)/f/sub C/(..cap alpha.., p/sub perpendicular/) is discussed. It is shown that R/sub A//C increases noticeably in the region ..cap alpha.. = 0.6 to 2.0. This may offer evidence that the fraction of hard quarks increases with increasing A.

• Research Organization: Erevan Physics Institute
• OSTI ID: 5262556
• Journal Information: Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 41:2; ISSN SJNCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BASIC INTERACTIONS
CARBON 12
CARBON 12 TARGET
CARBON ISOTOPES
COMPOSITE MODELS
COPPER 63
COPPER 63 TARGET
COPPER ISOTOPES
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
FERMIONS
FUNCTIONS
HADRONS
HEAVY NUCLEI
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
LEAD 208
LEAD 208 TARGET
LEAD ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PARTICLE MODELS
PARTICLE PRODUCTION
PHOTONUCLEAR REACTIONS
PHOTOPRODUCTION
PHOTOPROTONS
PROTONS
QUARK MODEL
STABLE ISOTOPES
STRUCTURE FUNCTIONS
TARGETS