## A range-ionization method to identify stopping Kaons in ILFord G.5 nuclear emulsion

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The identification of stopping charged particles in G.5 nuclear emulsion by using a residual range ionization method has been investigated in this experiment using a large stack of ILFord, G.5 nuclear emulsion pellicles exposed to 450 and 435 Me V/c K ˉ mesons at the Berkeley Bevatron.The restricted rate of energy loss vs kinetic energy for protons has been calculated theoretically, and given in Barkas(9). Then for given values of B , we calculated the restricted rate of energy loss vs the kinetic energy of muon, pion, kaon, and sigma particles.The measurement of the residual range and the counting of blobs in each residual range segment were carried out for four known stopping pions tracks. A second degree polynomial computer fit program was used to interpret the plot of residual range vs blobs/100 μ m. Then a particular point on the plot was chosen as a reference for normalizing the relative grain density (g*), theoretically and experimentally. Next, theoretical tables of residual range (R) vs relative grain density (g*theo) were calculated for muons, pions, kaons, protons, and sigmas. Those portions of the latter tables, for which (g*theo) was less than - 2, were used for the above mentioned theoretical plot of residual range (R) vs relative grain density (g* theo). The theoretically predicted curves were then tested by experimentally measuring the residual range and counting the blobs of each range segment of two selected stopping particle (primary) tracks which we suspected to be stopping kaon tracks. Then the second degree polynomial computer fit to the plotted data of the measured residual range vs blobs/l00 μm was carried out for each of the two suspected stopping kaon particles. Three points from each curve were picked and superimposed on the theoretical curves. The results were good but showed that it is necessary to measure a sufficiently long residual range, and more than one segment of blob-counts should be used along the measured residual range for accurate identification of the given particle.Ball State UniversityMuncie, IN 47306