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LETTERS TO TABLE I. Ratio: RdTh neutrons Ratio: RdTh protons . Photo-proton ratio Ga neutrons Ga protons R Photo-neutron ratio 0.96 0.05 0.98 i0.04 1.02 40.08 1.41 ±0.04 1.4340.04 1.014±t0.06 For the photo-proton ratio, the number of counts from the ionization chamber was recorded at the same discriminator bias voltage for each source. A correction for "wall effect" in the chamber has to be considered. If the range of a proton were proportional to its energy, a constant fraction of the photo-protons would be unrecorded. As it is not, the wall effect corrections for the two sets of photo-protons (estimated to be 150 kv and 210 kv) are different. It is possible to adjust the deuterium pressure (21 atmos.) so that the total correction is only 10 percent, in which case the uncertainty in the ratio of counts is unlikely to exceed 1 percent. To integrate the photo-neutron flux, the sources were placed at the center of a sphere of heavy water of 8-cm radius, contained in a thin copper vessel. This was suspended at the center of a cylindrical tank, 60 cm in diameter and 60 cm deep, containing an aqueous solution of MnSO4. After irradiation for
Physical Review – American Physical Society (APS)
Published: Sep 1, 1949
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