The gas-filled scattering chamber has been applied to the study of the distribution in angle of the protons from the D-D reaction with 9.94±0.08-Mev deuterons from the cyclotron. Photographic plates were used as detectors. The other charged particles produced in the reaction and from scattering processes were prevented from reaching the emulsion by covering the photographic plates with a 53.2-mg/cm 2 aluminum foil. Differential cross sections were determined at 10° intervals from 15° to 65° in the laboratory system. Background runs were made to determine the correction necessary because of the flux of neutrons in the chamber. Additional corrections were made for the penetration of the protons through the edges of the defining slit and for geometrical errors. The total cross section for the production of protons was calculated to be 7.3xio~2 6 cm 2 .
The differential scattering cross section for 9.94±0.08-Mev deuterons scattered by protons has been determined with nuclear track emulsions as detectors. The deuterons were obtained from the cyclotron while the target consisted of hydrogen gas at a pressure of approximately 5 cm of mercury.The photographic plates were arranged so that they recorded simultaneously at all laboratory angles from 12.5° to 65°. Approximately 5000 proton tracks at each of 12 angles in this range were counted. Geometrical, slit scattering, and slit penetration corrections have been made to the number of tracks counted.
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