Abstract
Scattering measurements by the Constant Sagitta method, using a scattering scheme based on the Gottingen tables (4), were made on tracks of particles stopping in the emulsion and at least 3 cm long. The following general results were obtained: (i) The mean value of the sagitta,\(\bar D\), for protons was found to be about 3% in excess of the theoretical value. (ii) The spread of the experimental observations of\(\bar D\) corresponds quite closely to its expected statistical value calculated on the basis of the\(75/\sqrt N \% \) formula for the standard error. A good resolution for proton and deuteron groups was obtained on the basis of 3 cm and 2 cm track lengths. (iii) The range-energy exponent deduced from the observations on deuteron/proton and triton/proton mass ratios and from the variation of the value of\(\bar D\) with residual range was found to be in good agreement with the value 0.568 ofFayet al. (4) andVigneron (12). (iv) No particle corresponding to a 1450 me meson suggested byFowler andPerkins (9) was observed, although the present statistics are not sufficient to exclude definitely the existence of such a particle.
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