PHOTOPRODUCTION OF NEUTRAL PIONS AT ENERGIES 500 to 940 Mev

Journal Article · Tue Jul 15 04:00:00 EDT 1958 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.111.622· OSTI ID:4305833

Vette, J I

The process gamma + p yields pi /sup 0/ + p was studied by detecting recoil protons from a liquid hydrogen target which was bombarded by the bremsstrahlung beam of the California Institute of Technology electron synchrotron. The angle and momentum of the recoil protons were measured by a magnetic spectrometer-three scintillation counter coincidence system. The process was studied between photon laboratory energies of 490 and 940 Mev and between pion center-of-mass angles of 31.5 and 147 deg . Protons which arose from meson pair production were significant at forward laboratory angles. A correction for this contamination is discussed. The results of these measurements show two interesting features. One is that the total cross section, which falls very rapidly above the 3/2 - 3/2 resonance energy near 320 Mev, reaches a minimum at about 600 Mev. and then increases to a broad maximum near 800 or 900 Mev. The other striking feature of the data is that the shape of the angular distribution seems to change rather suddenly near 900 Mev. (auth)

• Research Organization: California Inst. of Tech., Pasadena
• NSA Number: NSA-12-016596
• OSTI ID: 4305833
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 111; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
BEAMS
BREMSSTRAHLUNG
COINCIDENCE METHODS
CROSS SECTIONS
DETECTION
ELECTRONS
ENERGY RANGE
ERRORS
GAMMA SOURCES
HYDROGEN
INTERACTIONS
IRRADIATION
LIQUIDS
MAGNETIC FIELDS
MEASURED VALUES
MESONS
MOMENTUM
PAIR PRODUCTION
PHOTONS
PHOTOPRODUCTION
PHYSICS
PIONS
PROTONS
RECOILS
RESONANCE
SCATTERING
SCINTILLATION COUNTERS
SPECTROMETERS
SYNCHROTRONS
TARGETS