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PHOTO-ALPHA REACTIONS IN NUCLEAR EMULSIONS

1953; NRC Research Press; Volume: 31; Issue: 5 Linguagem: Inglês

10.1139/p53-068

1208-6045

C. H. Millar, A. G. W. Cameron,

Astro and Planetary Science

In experiments to search for new photonuclear reactions involving the emission of heavy particles [Formula: see text], Ilford E1 emulsions were exposed to 240 roentgens of X radiation from the University of Saskatchewan betatron operating at energies up to 27 Mev. The plates were developed by a special "grain-gradation" technique which suppressed proton tracks and X-ray fog. The ejection of single α particles was observed from C 13 , N 14 , O 16 , Ag, and Br. Multiple-pronged stars were observed due to the photodisintegration of C 12 , N 14 , O 16 , and probably Ag or Br. Interpretations of these events were deduced, and cross section versus energy curves for many of them were obtained. Range–energy relationships were obtained for Be 9 , B 10 , and C 12 particles in E1 emulsions.