CHARACTERISTICS OF A LEAD-CLASS PHOTON SPECTROMETER AND ITS USE IN STUDYING THE ABSORPTION OF PHOTONS AND ANTINUCLEONS (thesis)

Technical Report · Wed Dec 12 04:00:00 EST 1956

OSTI ID:4301975

Brabant, J M

A spectrometer for analyzing photons of energies extending up to several Bev was constructed. This instrument contains in a lead-glass medium a large fraction of the cascade shower that is initiated by the incoming photon and observes by means of phototubes the Cherenkov radiation that is emitted by the electrons in the shower. It was calibrated up to 1.5 Bev photon energy, and its response is very nearly linear. Using this device, a good-geometry experiment was performed to measure the electron-pair production cross sections at 2.5 plus or minus 0.5 Bev in lead and aluminum. Photons from an internal target of the Bevatron were used. The measured cross sections were 34.6 plus or minus 6.6 b in lead and 1.22 plus or minus 0.17 b in aluminum. In a modified form, this instrument was used to study the interaction of antiprotons in matter. Estimates of the efficiency for containing the annihilation products and of the type and multiplicity of these products indicate that the pulse spectra that are expected to be observed are compatible with those measured. Attenuation effects in a copper absorber and the lead glass indicate that the absorption cross sections are about twice geometric at about 450 Mev and increase as the antiproton energy decreases below 450 Mev. (auth)

• Research Organization: California. Univ., Berkeley. Radiation Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-12-012045
• OSTI ID: 4301975
• Report Number(s): UCRL-3619
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
ALUMINUM
ANNIHILATION
ANTIPROTONS
BEVATRON
CHERENKOV RADIATION
COPPER
COSMIC RADIATION
CROSS SECTIONS
ENERGY
ENERGY RANGE
GLASS
INTERACTIONS
LEAD
MEASURED VALUES
PAIR PRODUCTION
PHOTONS
PHYSICS
PLANNING
PULSES
SCATTERING
SHOWERS
SPECTRA
SPECTROMETERS
STANDARDS
SYNCHROTRONS
TARGETS
VARIATIONS