ENERGY SPECTRUM OF CHARGED PIONS FROM 2.2-Bev PROTONS ON Be

Journal Article · Sun Dec 01 04:00:00 EST 1957 · Physical Review (U.S.) Superseded in part by Phys.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

DOI:https://doi.org/10.1103/PhysRev.108.1331· OSTI ID:4342193

Niemann, F L; Bowker, J K; Preston, W M; Street, J C

Nuclear emulsions were exposed to the radiations produced by 2.2-Bev protons incident upon an internal Be target in the Brooknaven Cosmotron. Particles were identified and their energies determined by grain counts and multiple scattering measurements. Approximately 1OO pion tracks were studied at each of three laboratory angles, 12 deg , 18 deg , and 36 deg with respect to the direction of the incident beam. Assuming a simple nucleon-nucleon interaction in the target, these data correspond to spectra ncar 30, 50, and 9O deg in the center-of-mass system of two nucleons. Over this 30 to 9O deg angular range, the portion of the spectrum near 100 Mev is roughly isotropic, while in the 200- to 300-Mev range it is strongly anisotropic. A comparison of these and other results with recent calculations based on the isobar model reveal certain basic inconsistencies. The observed angular distributions appear qualitatively to be more in agreement with those to be expected from the statistical theory modified to include the final-state particle interactions and the conservation of angular momentum. (auth)

• Research Organization: Harvard Univ., Cambridge, Mass.
• NSA Number: NSA-12-004501
• OSTI ID: 4342193
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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
ANGULAR MOMENTUM
BERYLLIUM
CHARGED PARTICLES
COSMOTRONS
CYCLOTRONS
ENERGY
ENERGY LEVELS
ENERGY RANGE
INTERACTIONS
MEASURED VALUES
MOMENTUM
NUCLEAR EMULSIONS
NUCLEAR MODELS
PARTICLE TRACKS
PHYSICS
PIONS
PROTON BEAMS
RADIATIONS
SCATTERING
SPECTRA
STATISTICS
SYNCHROTRONS
TARGETS