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Analysis of Nucleon-Nucleus Collision of Energy around 100 GeV

1962; Physical Society of Japan; Volume: 17; Issue: 1 Linguagem: Inglês

10.1143/jpsj.17.1

1347-4073

Shigeo Matsumoto,

Earth Systems and Cosmic Evolution

The experimental data of nucleon-nucleus collisions of energies around 100 GeV have been analysed. It is pointed out that the transverse momentum, p T , of shower particles is also an adequate parameter to analyse the nucleon- nucleus collision. The transverse momenta, both in the average value and in the distribution, are similar to the case of the nucleon-nucleon collision. Both the median angle and the average number of shower particles increase with the number of heavily ionizing prongs, N h . The latter observations exclude the possibility that, for primary energy at least up to several tens GeV, the target of events with high N h is effectively a single nucleon. Although conclusive evidence to reject the model of cascade development (of nucleon-nucleon and pion-nucleon collisions) is not presented, this model seems to be disagreement with the data of p T . The existing data can reasonably be explained by the model of a simultaneous collision between an incident nucident nucleon and a lump of nucleons. That is, the model of simultaneous collision is preferable to the cascade model.