Matsusho Gakuen Junior College

About: Matsusho Gakuen Junior College is a based out in . It is known for research contribution in the topics: Negative binomial distribution & Poisson distribution. The organization has 8 authors who have published 38 publications receiving 298 citations.

Energy Spectra of Cosmic Rays above 1 TeV per Nucleon

Abstract: Direct measurements of cosmic-ray nuclei above 1 TeV/nucleon have been performed in a series of balloon-borne experiments with emulsion chambers. The observed all-particle spectrum above 20 TeV is consistent with the results of the Proton satellite and many air shower experiments. The proton spectrum is consistent with a power law having an index of 2.76 + or - 0.09 up to at least 100 TeV, but an overabundance of helium by a factor of 2 above 2 TeV per nucleon is found when compared with the extrapolation from the low energies. For heavy elements (C through Fe), the intensities around 1 TeV/nucleon are consistent, within the statistical errors, with the extrapolation from lower energy data using the Spacelab 2 spectral indices. An enhancement for the medium-heavy components (C through Ca) above 200 TeV is indicated. The mean mass above 50 TeV indicates slightly higher values than the results of the air shower experiments.

Scaling Behavior of (Nch)−1dNch/dη at by the PHOBOS Collaboration and Its Implication A Possible Explanation Employing the Ornstein-Uhlenbeck Process

Abstract: Recently, interesting data concerning $dN_{ch}/d\\eta$ in Au-Au collisions [$\\eta=-\\ln \\tan (\\theta/2)$] with centrality cuts have been reported from the PHOBOS Collaboration. In most treatment these data are divided by the number of participants (nucleons) in collisions. Instead of this method, we use the total multiplicity $N_{ch} = \\int (dN_{ch}/d\\eta)d\\eta$ and find that there is scaling phenomenon among $(N_{ch})^{-1}dN_{ch}/d\\eta = dn/d\\eta$ with different centrality cuts at $\\sqrt{s_{NN}} = 130$ GeV. To explain this scaling behavior of $dn/d\\eta$, we employ a stochastic approach using the Ornstein-Uhlenbeck process with two sources. A Langevin equation is adopted for this explanation. Moreover, comparisons of $dn/d\\eta$ at $\\sqrt{s_{NN}} = 130$ GeV with that at $\\sqrt{s_{NN}} = 200$ GeV are made, and no significant difference is found. A possible method fot the detection of the quark-gluon plasma (QGP) through $dN_{ch}/d\\eta$ is presented.