Influence of the Coulomb field of the nucleus on the ratio of the yields of charged photopions

Journal Article · Sat May 01 04:00:00 EDT 1982 · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)

OSTI ID:6632716

Tonapetyan, S G; Khvorostyan, V M; Vinokurov, E A; Nikitin, V A; Shebeko, A V

We have measured the energy spectra of charged pions emitted at an angle theta/sub lab/ = 90/sup 0/ in interaction of photons with E/sup max//sub ..gamma../ = 400 MeV with the nuclei /sup 6/Li, /sup 12/C, /sup 24/Mg, /sup 28/Si, and /sup 40/Ca. The particles were recorded by means of a Freon bubble chamber in the energy range E/sub ..pi../ = 45--105 MeV. It was found that the maxima of the spectra of ..pi../sup -/ mesons are shifted relative to the maxima of ..pi../sup +/ mesons by approximately twice the magnitude of the Coulomb potential at the surface of the nucleus. Calculations carried out with Hartree-Fock wave functions for the nuclei /sup 12/C and /sup 40/Ca showed that the shifts of the pion spectra in energy are determined to a substantial degree by the shift of the neutron and proton levels in the nuclei.

• Research Organization: Khar'kov Physico-technical Institute, Ukrainian Academy of Sciences
• OSTI ID: 6632716
• Journal Information: Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 35:5; ISSN SJNCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BASIC INTERACTIONS
BOSONS
CALCIUM 40 TARGET
CARBON 12 TARGET
COULOMB FIELD
ELECTRIC FIELDS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
FUNCTIONS
HADRONS
HARTREE-FOCK METHOD
INTERACTIONS
LITHIUM 6 TARGET
MAGNESIUM 24 TARGET
MESONS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR REACTIONS
PARTICLE PRODUCTION
PHOTONUCLEAR REACTIONS
PHOTOPRODUCTION
PIONS
PIONS MINUS
PIONS PLUS
PSEUDOSCALAR MESONS
SILICON 28 TARGET
SPECTRA
TARGETS
WAVE FUNCTIONS