Mechanism of the (. pi. /sup + -/,. pi. /sup + -/, d) and (. pi. /sup + -/,. pi. /sup + -/, He) reactions in light nuclei at 170 MeV

Journal Article · Sun Jun 01 04:00:00 EDT 1980 · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)

OSTI ID:6765544

Berdnikov, Y A; Gismatullin, Y R; Melent'ev, A A

Nuclear emulsions have been used to study the ..pi..eactions (..pi../sup + -/, ..pi../sup + -/, d) and (..pi../sup + -/, r/sup + -/, He) in the nuclei C, N, and O at a ..pi..-meson energy 170 Mev. We have obtained integrated cross sections, momentum and angular distributions of the residual nuclei, energy and angular distributions of deuterons and helium nuclei, and the differential cross section for pion scattering. A theoretical analysis of the experimental data is carried out. It is found that in the region of low residual-nucleus momentum q (less than 200 MeV/c) the direct knockout of deuterons and He nuclei is dominant. It is shown that the low energies of these particles (less than 20 MeV) are due to scattering of the pion by the heavy fragment and to the two-stage mechanism. It is observed that for deuteron energies 15--50 MeV and large q the experiment is consistent with the triangle mechanism with nucleon pickup. The contributions of these mechanisms to the cross sections for the investigated reactions are determined, and a comparison is made with similar data at energies 60 and 115 MeV.

• Research Organization: Leningrad Polytechnic Institute
• OSTI ID: 6765544
• Journal Information: Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 31:6; ISSN SJNCA
• Country of Publication: United States
• Language: English

Related Subjects

645104* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
CARBON
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DEUTERONS
DIRECT REACTIONS
DISTRIBUTION
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
FLUIDS
GASES
HADRON REACTIONS
HELIUM
INFORMATION
INTEGRAL CROSS SECTIONS
KNOCK-OUT REACTIONS
LINEAR MOMENTUM
MESON REACTIONS
MEV RANGE
MEV RANGE 100-1000
MULTIPLE SCATTERING
NITROGEN
NONMETALS
NUCLEAR REACTIONS
NUMERICAL DATA
OXYGEN
PION MINUS REACTIONS
PION PLUS REACTIONS
PION REACTIONS
RARE GASES
SCATTERING