EFFECTS OF THE SINGLE PION EXCHANGE IN THE REACTION p + p $Yields$ n + p + $pi$$sup +$ (thesis)

Technical Report · Mon Mar 11 04:00:00 EST 1963

OSTI ID:4669225

Lach, J T

The distribution of neutrons in energy and angle from the reaction p + p ons in pyrolyti n + p + ceramic materia /sup +/ at an incident proton momentum of 2.5 Bev/c is studied. The coordinates of the three final-state particles are measured by an array of plastic scintillation counters, the energy of the recoil neutron being determined through its flight time. The range of measured neutron angles is limited to 4 to 60 deg, and the range of recoil momentum is from approximately 150 to 330 Mev/c. Data are recorded on magnetic tape in a format directly acceptable to an IBM 7090 computer where sorting and kinematical fitting is done. A Monte Carlo computation is made in which the effects of the complex resolution functions of the apparatus and the fitting code are investigated and used to compute the overall efficiency and resolution of the apparatus. Because of geometrical limitations of the angular region in which the final state pion and proton could be detected, and the inability to distinguish between them in 18% of the events, the analysis is limited to a region of /sup */, the pion- proton scattering angle, bounded by -0.5 < cos ( /sup */) < +0.5. Comparisons are made with predictions of the one-pion exchange model. A Chew-Low extrapolation is performed and deviations from a linear extrapolation are found. The peripheral model predictions of Selleri agree well with the observed position and reasonably well with the observed shape of the 3/2, 3/2 resonance if an integration is made over momentum transfer. The cross section, as a function of momentum transfer, deviates from the predicted behavior. (auth)

• Research Organization: California. Univ., Berkeley. Lawrence Radiation Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-17-026292
• OSTI ID: 4669225
• Report Number(s): UCRL-10718
• Country of Publication: United States
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
CHEW-LOW METHOD
COMPUTERS
CROSS SECTIONS
DIGITAL SYSTEMS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY
FIELD THEORY
IBM 7090
INTERACTIONS
MEASURED VALUES
MOMENTUM
MONTE CARLO METHOD
NEUTRONS
NUMERICALS
OPE MODEL
PARTICLE MODELS
PERIPHERAL COLLISIONS
PHYSICS
PIONS
PIONS-PLUS
PROTONS
RECOILS
RESOLUTION
RESONANCE
SCATTERING
SCINTILLATION COUNTERS
TIME OF FLIGHT METHOD