Akira Minaka

Leading Particle Spectra on Nuclear Targets and Multi-Chain Model

Leading nucleon spectra on nuclear targets are analyzed by the multi-chain model with sequential collision of the leading cluster. It is shown that the model can successfully repro· duce both the leading particle spectra and the charged particle distribution. The inelasticity of the leading cluster turned out to be smaller than 0.2 which gives a strong constraint on any type of multiple collision models.

Recoil Nucleon Effect in the Hadron-Nucleus Collision and Multi-Chain Model

As a natural extension of the multi-chain model, which reproduces the charged particle distribution in hadron-nucleus collisions in the central and projectile fragmentation regions, the cascade mechanism due to the recoil nucleon is incorporated in the model. It is shown that this effect almost fills up the discrepancy observed in the target fragmentation region. The influence of the multi-baryon state in the target nucleus is also examined in relation to the ratio of the charged particles produced on nuclear target to that on nucleon target.

Geometrical Structure of Hadrons and Diffractive Eigenstates

In the framework of the diffractive eigenstate formalism it 1s discussed what structure of haclrons is implied by the observed large cross section of diffractive excitation. Using the geometrical model as a realization of the eigenstate it is shown that the matter distribution of a proton cannot have a simple shape such as a breathing ellipsoid. The matter should dissociate into two or more pieces and/or there should be a finite probability of vanishment of the strongly-interacting matter, for example.

Eigenstate Formalism for Single and Double Diffractive Excitation

As a natural extension of the diffractive eigenstate formalism, we give formulae to describe the single and double diffraction separately. We show examples that either the single or double diffraction cross section vanishes. The present formalism will serve as a useful tool in the study of the diffractive eigenstates and the hadron structure.