PHOTOPRODUCTION OF MESONS FROM HYDROGEN AND DEUTERIUM

Journal Article · Thu Jun 01 04:00:00 EDT 1961 · Physical Review (U.S.) Superseded in part by Phys.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.122.1631· OSTI ID:4060612

Kenney, R W; Knapp, E A; Perez-mendez, V; Perkins, W A

The relative yields of positive pions produced from hydrogen and deuterium by a 340 Mev bremsstrahlung beam are measured in the laboratory system at angles of 20, 40, and 60 deg , and at pion energies from 45 to 145 Mev. The ratio of the relative yields of pions from deuterium and hydrogen is roughly constant as a function of angle, but decreases monotonically with pion energy from a value of 0.90 plus or minus 0.05 at45 Mev to a value of 0.55 plus or minus 0.07 at 145 Mev. Comparison with the phenomenological theory of Chew and Lewis indicates a gradual change from nucleon spin flip near threshold to no-spin- flip transitions above 140 Mev. Comparison with Uretsky's calculation involving final states shows fair agreement with plane-wave and shapeindependent approximations. Poor agreement with the zero-range approximation sbows that final-state interactions are important in the theory of photoproduction of pions from deuterium. (auth)

• Research Organization: Univ. of California, Berkeley
• NSA Number: NSA-15-020093
• OSTI ID: 4060612
• Report Number(s): UCRL-9491; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 122; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

BEAMS
BREMSSTRAHLUNG
DEUTERIUM
EFFICIENCY
ENERGY RANGE
HYDROGEN
MEASURED VALUES
MESONS
MEV RANGE
NUCLEAR REACTIONS
NUCLEONS
PHOTOPRODUCTION
PHYSICS
PIONS
SPIN
VARIATIONS