Abstract:Recent p +A ...... p +X data are analyzed within the context of the multi-chain and additive quark models. We deduce the average energy loss of a baryon as a function of distance traversed in nuclear matter. Consistency of the multi-chain model is checked by comparing the predictions for p +A ...... 1r± +X with data. We discuss the space-time development of baryon stopping and show how longitudinal growth limits the energy deposition per unit length. Predictions are made for the proton spectra to be measured in nucleus-nucleus collisions at CERN and BNL. Finally, we conclude that the stopping domain for central collisions of heavy ions extends up to center of mass kinetic energies K E"" ~ 3 ± 1 AGev.

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We consider the nuclear mass-number (A) dependence of the nuclear structure functions. We restrict ourselves to a two-component model, in which we assume the existence of an exotic component other than the normal nucleon component in nuclei. We find that there exist scaling phenomena and that the structure function of the exotic component should be independent of A. We also show that the A dependence of the nuclear structure function can be attributed to that of the surface-to-volume ratio which is incorporated in the probability of finding the exotic component in the nucleus.PACS numbers: 25.30.Fj, 13.60.Hb, 21.65. + f Aubert et al. l and Bodek et al. 2 have revealed that there is a significant difference between the nuclear structure functions per nucleon Ff e (x,(? 2 ) and F? (x,Q 2 ) which are obtained from deepinelastic lepton-iron and lepton-deuterium scattering at large four-momentum transfer Q. This fact tells us that the quark structure of the nucleus cannot be deduced only from that of a free nucleon and attracts the attention of both nuclear and highenergy physicists. Recently, new experimental data on the ratio R A (x,Q 2 ) of cross sections per nucleon for deep-inelastic lepton scattering off various nuclei A to that off deuterium have been reported. 3 In this experiment, the ratios O-L /(T T of cross sections for absorption of longitudinal and transverse photons for various nuclei at Q 2 = 5 (GeV/c) 2 are also measured. Because

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. § I. IntroductionIn the hadron-nucleus (h-~1) interactions, the nucleus plays the role of the target for both incident hadron and newly produced hadronic systems. Therefore the investigation of h-A collisions will give us peculiar information about the space-time development of hadron interactions and the many-body structure of hadrons which cannot be obtained through usual hadron-hadron (h-h) collisions. \V e have analyzed h-~1 interaction based on the multi-chain model (MCM),!)where the beam hadron has independent multiperipheral chains connecting the beam particle and each nucleon inside the nucleus. The resulting picture of the interaction is presented schematically in Fig. 1. Our previous investigation was mainly concerned with the partition of the beam energy among the chains, where three models were considered, namely the equipartition modeFl (Model I), the model taking account of the inequality (Model II) and the sequential collision model (Model III). The result obtained is that any of them cannot be eliminated at all by comparing only the pseudorapidity distribution of the charged particles. (For the details, see Ref. 1) . )In this paper the leading particle spectra on nuclear targets are analyzed by a generalized version of Model III and it is shown that the leading cluster should carry most of the momentum fraction of the incident hadron (i.e., the elasticity Fig. 1. Multi-chain model (general) at