Leading nucleon and inelasticity in hadron-nucleus interactions

We present in this paper a calculation of the average proton-nucleus ine- lasticity. Using an Iterative Leading Particle Model and the Glauber model, we relate the leading particle distribution in nucleon-nucleus interactions with the respective one in nucleon-proton collisions. To describe the leading particle distribution in nucleon-proton collisions, we use the Regge-Mueller formalism. To appear in Journal of Physics G.Comment: 11 pages, 2 figure

Diffractive Contribution to the Elasticity and the Nucleonic Flux in the Atmosphere

We calculate the average elasticity considering non-diffractive and single diffractive interactions and perform an analysis of the cosmic-ray flux by means of an analytical solution for the nucleonic diffusion equation. We show that the diffractive contribution is important for the adequate description of the nucleonic and hadronic fluxes in the atmosphere.Comment: 10 pages, latex, 2 figures (uuencoded PostScript

Applicability of a Representation for the Martin's Real-Part Formula in Model-Independent Analyses

Using a novel representation for the Martin's real-part formula without the full scaling property, an almost model-independent description of the proton-proton differential cross section data at high energies (19.4 GeV - 62.5 GeV) is obtained. In the impact parameter and eikonal frameworks, the extracted inelastic overlap function presents a peripheral effect (tail) above 2 fm and the extracted opacity function is characterized by a zero (change of sign) in the momentum transfer space, confirming results from previous model-independent analyses. Analytical parametrization for these empirical results are introduced and discussed. The importance of investigations on the inverse problems in high-energy elastic hadron scattering is stressed and the relevance of the proposed representation is commented. A short critical review on the use of Martin's formula is also presented.Comment: Two comments and one reference added at the end of Subsec. 3.3; 23 pages, 9 figures; to be published in Int. J. Mod. Phys.

Composition of Primary Cosmic Rays Beyond the ``Knee''from Emulsion Chamber Observations

We show that the simplest assumptions for the dynamics of particle production allow us to understand the fluxes of hadrons and photons at mountain altitudes as well as the structure of individual events. The analysis requires a heavy nuclear component of primary cosmic rays above the ``knee" in the spectrum with average mass number $= 7.3 \pm 0.9$.Comment: Revtex, 11 pages, 5 postscript figures ("\special" command used to embed figures at end of tex file). Compressed postscript version also available at http://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-932.ps.Z or ftp://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-932.ps.

Leading particle effect, inelasticity and the connection between average multiplicities in {\bf e+e−e^+e^-} and {\bf pppp} processes

The Regge-Mueller formalism is used to describe the inclusive spectrum of the proton in $p p$ collisions. From such a description the energy dependences of both average inelasticity and leading proton multiplicity are calculated. These quantities are then used to establish the connection between the average charged particle multiplicities measured in {\bf $e^+e^-$} and {\bf $pp/{\bar p}p$} processes. The description obtained for the leading proton cross section implies that Feynman scaling is strongly violated only at the extreme values of $x_F$, that is at the central region ($x_F \approx 0$) and at the diffraction region ($x_F \approx 1$), while it is approximately observed in the intermediate region of the spectrum.Comment: 20 pages, 10 figures, to be published in Physical Review

On The Question Of The Energy Dependence Of Inelasticity

We discuss the question of the energy dependence of inelasticity in very-high-energy hadronic interactions. From existing extensive-air-shower data, a definite conclusion cannot yet be reached. However, Glauber model realistic calculations and recent results from Tevatron suggest a slow increase of the mean inelasticity with energy. © 1992.2791-2149152Amos, (1990) Phys. Lett. B, 243, p. 158Bellandi, Mundim, Dias de Deus, Covolan, J. Phys. C (1991) J. Phys. C, , to be publishedBurnett, (1990) Astrophys. J., 349, p. L25Allkofer, (1975) Introduction to cosmic radiation, , Verlag Karl Thiemig, MunichLiland, (1987) Proc. XXth Intern. Cosmic ray Conf., 6, p. 178. , IUPAP, (Moscow, USSR)Glauber, Mathiae, (1970) Nucl. Phys. B, 21, p. 135Hofstadter, Nuclear and Nucleon Scattering of High-Energy Electrons (1957) Annual Review of Nuclear Science, 7, p. 231Linsley, (1985) Proc. XIXth Intern. Cosmic ray Conf., 6, p. 1. , La Jolla, USA, and references therein for experimental dataHara, (1983) Phys. Rev. Lett., 50, p. 2058Hara, (1983) Proc. XVIIth Intern. Cosmic ray Conf., 11, p. 354. , Bangalore, IndiaBaltrusaitis, (1984) Phys. Rev. Lett., 52, p. 1380Bellandi, On the behaviour of inelasticity at very high energy (1991) Physics Letters B, 262, p. 102Brooke, Wolfendale, (1964) Proc. Phys. Soc., 83, p. 843Ashton, (1970) Acta Phys. Acad. Sci. Hung., 29, p. 25Vall, (1987) Sov. J. Nucl. Phys., 44, p. 806Wilk, (1991) Contrib. XXIInd Intern. Cosmic ray Conf., , Dublin, IrelandFowler, (1987) Phys. Rev. D, 35, p. 870Gaisser, (1989) Phys. Lett. B, 219, p. 375Gaisser, (1990) Proc. 21st Intern. Cosmic ray Conf., 8, p. 55. , AdelaideKopeliovich, (1989) Phys. Rev. D, 39, p. 769Azaryan, (1975) Sov. J. Nucl. Phys., 20, p. 213Slavatinskii, (1964) Sov. Phys. JETP, 19, p. 1452Basile, (1983) Nuovo Cimento, 73 A, p. 32