PHOTOPRODUCTION OF NEGATIVE MESONS IN DEUTERIUM

Journal Article · Sat Oct 15 04:00:00 EDT 1960 · Physical Review (U.S.) Superseded in part by Phys.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.120.614· OSTI ID:4125641

White, D H; Schectman, R M; Chasan, B M

A 24-in. diffusion cloud chamber fiiled to 14 atm with tritium-free deuterium gas, operating in a magnetic field of 6 kilogauss, was placed in the 1040-Mev "hardened" bremsstrahlung beam of the Cornell synchrotron. A total of 310 events of the type gamma + d - p i p pi /sup -/ were observed and analyzed. Using the "spectator model," a total cross section was determined for the reaction gamma + n - p + pi /sup -/ from threshold to 1 bev, in good agreement with the results obtained from the measurement of the negative-to-positive pion ratio together with the measured cross section for the reaction gamma + p - n + pi /sup +/. The momertum distribution of the low-energy protons in the laboratory system compares very favorably with the internal momentum distribution of the deuteron as calculated from the Hulthen or Gartenhaus wave functions. The validity of the spectator model for photons above 200 Mev is experimentally justified. as is expected in consideration of the assumptions of the impulse approximation. A study of the forward-backward asymmetry of the spectator protons in the laboratory system indicates that above photon energies of 250 Mev, there is a 15% deviation from isotropy, favoring the forward beam direction, indicating that the spectator proton is being "pulled along" with the net forward momertum of the rest of the system, through an average forward momentum transfer of about 10 Mev/c. (auth)

• Research Organization: Cornell Univ., Ithaca, N.Y.
• NSA Number: NSA-15-003352
• OSTI ID: 4125641
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 120; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BEAMS
BREMSSTRAHLUNG
CORNELL SYNCHROTRON
CROSS SECTIONS
DEUTERIUM
DIFFUSION
ENERGY LEVELS
GASES
IONIZATION CHAMBERS
MAGNETIC FIELDS
MEASURED VALUES
MESONS
PHOTONS
PHYSICS
PI MESONS
PIONS
SYNCHROTRONS