Stars in Photographic Emulsions Initiated by Deuterons. Part I. Experimental

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Abstract
Photographic plates have been bombarded with deuterons in the 184-inch Berkeley cyclotron, and a group of 1200 stars in the emulsion has been studied. The group included 300 stars at each of the following energies: 35 Mev, 90 Mev, 130 Mev, and 190 Mev. At each of these energies the average number of prongs per star was close to 3.0. About three times as many prongs were observed in the forward direction of the beam as in the backward direction. The study was made with desensitized plates, which do not show tracks of high energy protons. The results are to be interpreted as including all alpha particles and heavier nuclear fragments but only the lower energy protons.