SMALL-ANGLE PHOTOPRODUCTION OF POSITIVE PIONS FROM HYDROGEN

Journal Article · Wed Jan 01 04:00:00 EST 1958 · Physical Review (U.S.) Superseded in part by Phys.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.109.158· OSTI ID:4313154

Malmberg, J H; Robinson, C S

The angular distribution of pi /sup +/ meeons produced in hydrogen by 225-Mev photons has been measured in the smallangle region. The mesons were produced in a liquid hydrogen target placed in the x-ray beam of the 300-Mev betatron. A focusing magnet was used to select mesons of the desired momentum. The large electron pair background was avoided by use of a very short x-ray pulse and a counter system which operated only after the pulse, counting the decays of mu /sup +/ mesons. Points have been obtained at center-of-mass angles of 10, 15, 20, 30, 45, 60, and 90 degrees. The observed angular distribution cannot be fitted by a quadratic in cos THETA *, but is well fitted by the cross section calculated from the field theory of Chew, Goldberger, Low. and Nambu. (auth)

• Research Organization: Univ. of Illinois, Urbana
• NSA Number: NSA-12-004362
• OSTI ID: 4313154
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 109; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
BACKGROUND
BETATRONS
COINCIDENCE METHODS
COUNTERS
CROSS SECTIONS
DECAY
ELECTRONS
ENERGY RANGE
FIELD THEORY
GAMMA RADIATION
HYDROGEN
INTERACTIONS
LIQUIDS
MAGNETIC FIELDS
MAGNETS
MEASURED VALUES
MESONS
MOMENTUM
MUONS
NUMERICALS
PAIR PRODUCTION
PHOTOPRODUCTION
PHYSICS
PIONS
PULSES
SCATTERING
TARGETS
X RADIATION