ELASTIC SCATTERING OF PI MESONS ON PROTONS IN THE ENERGY REGION 550 TO 1020 MEV (thesis)

Technical Report · Sun Oct 01 04:00:00 EDT 1961

OSTI ID:4819871

Wood, C D

The differential cross section was measured for elastic scattering of negative pi mesons from protons at incident pion kinetic energies of 550, 600, 720, 900, and 1020 Mev. Pions were produced when the Bevatron circulating proton beam struck a copper target. Pions of the requisite momentum were brought to a focus at a liquid hydrogen scattering target by a magnetic system for beam optics. EIastic scattering events were selected from a background of inelastic events by demanding coincidences between pairs of scintillation counters that were placed at the proper kinematicaI angles to count elasticaIly scattered pions and their corresponding recoil protons. The resulting angulardistribution curves were least-squares fitted with a cosine power series. A study of the coefficients of the power series permitted certain inferences to be made about the angular momentum states contributing to thc second and third maxima in the total pi n-- p cross section which occur at 600 and 900 Mev, respectively. The 600-Mev peak appears to be due to a D state, with a total J value of 3/2 rather than 5/2. The data at 900 Mev cannot be well explained by a single (F/sub 5/2/) state in resonance, but rather there is strong evidence for at least D and F waves in superposition. The forward ''diffraction'' peaking of the angular distribution indicates that absorptive processes may be predominant. (auth)

• Research Organization: California. Univ., Berkeley. Lawrence Radiation Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-16-006923
• OSTI ID: 4819871
• Report Number(s): UCRL-9507
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BACKGROUND
BETATRONS
BEVATRON
CONFIGURATION
COPPER
CROSS SECTIONS
D-WAVE
DIFFRACTION
ELASTIC SCATTERING
ENERGY LEVELS
ENERGY RANGE
F-WAVE
HYDROGEN
LEAST SQUARES
LIQUIDS
MAGNETIC FIELDS
MATHEMATICS
MEASURED VALUES
MEV RANGE
MOMENTUM
NUMERICALS
OPTICAL SYSTEMS
PHYSICS
PIONS
PROTON BEAMS
PROTONS
QUANTUM MECHANICS
RECOILS
SCATTERING
SCINTILLATION COUNTERS
SYNCHROTRONS
TARGETS
VELOCITY