$pi$$sup -$-PROTON INTERACTIONS AT 5 Bev

Journal Article · Fri Nov 01 04:00:00 EST 1957 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

OSTI ID:4347755

Maenchen, G; Fowler, W B; Powell, W M; Wright, R W

The interaction of 5-Bev negative pions with protons has been studied by exposing a 36-atmosphere hydrogen-filled diffusion cloud chamber to pi /sup -/ beams from the Berkeley Bevatron. One hundred and thirty-seven interactions producing charged outgoing particles were observed. Of these, 27 were elastic scattering events, 64 were inelastic collisions having two charged outgoing prongs, 39 had four prongs, 3 had six prongs, and 4 involved the production and visible decay of heavy unstable particles. The total cross section is estimated to be 22.5 plus or minus 2.4 mb. The elastic scattering cross section is 4.7 plus or minus 1.0 mb. The angular distribution of the elastic events is consistent with that expected for diffraction scattering from a sphere with radius (0.9 plus or minus 0.15) x 1O/sup -13/ cm and opacity 0.6. Analysis of the inelastic events shows that multiple, rather than single, pion production is the predominant process occurring at this energy. An average of 2.3 secondary pions were produced in the inelastic events. This average multiplicity can be fitted by the Fermi statistical theory only by increasing the interaction radius occurring in the theory by 20%. The statistical theory, however, fails to account for the rather marked asymmetry found in the c.m. angular distributions of some of the particles emitted in inelastic events. A combination of the four observed strange-particle production events with 11 similar events obtained in exposures to highenergy neutron and proton beams shows that pion emission accompanies strange-particle production in at least 60% of elementary-particle collisions at Bevatron energies. (auth)

• Research Organization: Univ. of California, Berkeley
• NSA Number: NSA-12-003096
• OSTI ID: 4347755
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 108; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
BEAMS
BEVATRON
CHARGED PARTICLES
CLOUD CHAMBERS
CROSS SECTIONS
DECAY
DIFFRACTION
DIFFUSION CHAMBERS
ELEMENTARY PARTICLES
EMISSION
ENERGY RANGE
FERMIONS
HYDROGEN
INTERACTIONS
IRRADIATION
MEASURED VALUES
MESONS
MULTIPLE PRODUCTION
NEUTRON BEAMS
PARTICLE MODELS
PARTICLE TRACKS
PHYSICS
PINUS
PIONS
PRESSURE VESSELS
PRODUCTION
PROTON BEAMS
PROTONS
SCATTERING
STRANGE PARTICLES
SYNCHROTRONS
TARGETS