SEMI-ANNUAL REPORT, 30 JUNE 1952-31 JANUARY 1953
FRANKLIN INST NEWARK DE BARTOL RESEARCH FOUNDATION
Pagination or Media Count:
Progress is reported on inelastic-scattering and total neutron- cross-section measurements and on instrumentation. A photographic plate is being used as the principal detector for inelastic-scattering experiments. Variations of the wedge geometry for shielding photographic plates were investigated before conducting collimator experiments. The desirable neutrons which could be detected were those proceeding from a D target to an Fe scatterer and then through an angle of 90 deg to the photographic plates. Most of the recoil protons resulting from direct irradiation of the plates were removed by selecting those having an energy above 2.3 Mev. Another recoil-proton source was neutrons proceeding directly from target to plate, to be scattered from the AgBr of the emulsion and from the Si in the glass backing of the emulsion. Irradiation of a cylindrical Fe scatterer produced a continuum of recoils below 4 Mev. Shielding was required between the target and the plates to prevent the direct neutrons scattered by AgBr and Si from masking the contribution from the Fe scatterer. Several types of shields were evaluated. Total cross sections were determined for Au, Mg, Cl, and P. The cross section for Au did not appear to have resonances in the 100- to 700-Kev range. Resonances occurred at several energies for Cl and P.
- Nuclear Physics and Elementary Particle Physics