In nuclear emulsions 1226 interactions of 27 GeV and 20.5 GeV protons were found in a systematic way by track following. The mean free path is (35.1 ±1.5) cm at 27 GeV and (35.6± 1.5) cm at 20.5 GeV. A list of the type of all interactions(N

 h
 ,N

 s
 ) is presented. A survey about the mean number of heavily ionizing tracks(N

 h
 ) and of shower particles(N

 s
 ) is given as a function of primary energyE. Between 1 GeV and 30 GeV we find for collisions in nuclear emulsions: = = 0.65(Ekin/GeV)0.7. Castagnoli’s method to estimate the primary energy from the angular distribution of the shower particles was applied to interactions withN

 h
 
≤ 1. The true energy is overestimated by a factor, which increases with decreasing multiplicity Ns. The interactions were separated into those on C, N, O target nuclei and those on Ag, Br target nuclei. At a primary energy of 24 GeV we found the following dependence of the mean number of shower particles on the atomic numberA = 3.4-A0.14±0.03. This is consistent with the hydrodynamic theory of multiple meson-production, but also with calculations assuming an intranuclear cascade. There are significant differences in the correlationN

 h
 
vs. N

 s
 for the two groups of target nuclei.

Interactions of 25 gev protons with protons and heavy nuclei in nuclear emulsions

Upper limit on beauty lifetime and lower limit on weak mixing angles

This is a continuation of our earlier investigation (Gurtuet al 1974Phys. Lett.
 50 B 391) on multiparticle production in proton-nucleus collisions based on an exposure of emulsion stack to 200 GeV/c beam at the NAL. It is found that the ratioR
 em = 〈n
 s〉/〈n
 ch〉, where 〈n
 ch〉 is the charged particle multiplicity in pp-collisions, increases slowly from about 1 at 10 GeV/c to 1·6 at 68 GeV/c and attains a constant value of 1·71 ± 0·04 in the region 200 to 8000 GeV/c. Furthermore,R
 em = 1·71 implies an effectiveA-dependence ofR
 A =A
 0.18,i.e., a very weak dependence. Predictions ofR
 em on various models are discussed and compared with the emulsion data. Data seem to favour models of hadron-nucleon collisions in which production of particles takes place through adouble step mechanism,e.g., diffractive excitation, hydrodynamical and energy flux cascade as opposed to models which envisage instantaneous production.

Energy dependence of multiplicity in proton-nucleus collisions and models of multiparticle production

Investigation of the decay of charmed particles produced in neutrino interactions

Inelastic Interactions of Particles at High Energies I. (The Composition and Multiplicity of Secondary Particles)

Proton interactions at 14 Bev with photographic emulsion nuclei were studied. Emulsion pellicles were exposed to an external beam of elastically scattered protons. The tracks were followed on the plates, and deflections greater than 2 deg in the plane of the emulsion sheet or 5 deg in the perpendicular plane were recorded. The interaction mean free path was found and a general analysis of the stars was made. Data are tabulated and/or graphically represented.

/pdf/interaction-of-high-energy-protons-from-the-cern-proton-34zv6mjnr5.pdf

Interaction of high energy protons from the CERN proton synchrotron with photographic emulsion nuclei

A stack of nuclear emulsion pellicles of total volume 10 litres was placed, together with two spark chambers in the neutrino beam of the CERN proton synchrotron. The tracks of secondary particles from neutrino interactions in the emulsion were observed in the spark chamber. The spark chamber tracks were used to locate the tracks produced by the same particles in the emulsion. These tracks were then followed back in the emulsion to the neutrino interaction in which they originate. Of a total of seven neutrino interactions expected to be produced in the emulsion stack during this exposure four were located in this way and their characteristics studied.

The location and analysis of neutrino interactions in photographic emulsion

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Interaction of high energy protons from the CERN proton synchrotron with photographic emulsion nuclei

The location and analysis of neutrino interactions in photographic emulsion