SEMI-ANNUAL REPT. 1 FEBRUARY-30 JUNE 1953 ON CONTRACT NONR 436(00) (BARTOL RESEARCH FOUNDATION OF THE FRANKLIN INSTITUTE)
FRANKLIN INST NEWARK DE BARTOL RESEARCH FOUNDATION
Pagination or Media Count:
Neutrons scattered 90 deg by a Cr cylinder were detected photographically with the paraffin-wedge technique. An elastically scattered group at about 4 mev was resolved as well as 2 groups at lower energies corresponding to inelastic scattering and the formation of Cr42 in excited states at about 1.43 and 1.93 mev. A scattering ring, an NaI-Tl crystal, and neutrons produced in the D-D reaction by the Van de Graaff statitron were used to measure gamma-rays from inelastic scattering. A discussion is presented of the following gamma-rays and relative intensities obtained Fe, 0.85 and 2.15 mev at 680 and 260 Bi, 0.90, 1.63, and 2.66 mev at 540, 1000, and 650, Pb, 0. 84, 1.55, and 2.66 mev at 400, 650 and 450 and Cr, 1.43 mev. The discrepancies are pointed out. Angular distributions were obtained for 3.7-mev neutrons scattered from Al, Pb, and Fe. Measured total cross sections of 2.55, 3.51, and 7.60 barns were obtained for Al, Fe, and Pb, respectively. The integrated differential cross sections were 1.73, 2.94, and 5.17 barns, respectively. Single and double scattering through the ring scatterer are analyzed in appendixes.
- Nuclear Physics and Elementary Particle Physics