Scattering Angle of Cosmic Ray Muons with Energy Loss Deep Underground

概要

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The root mean square scattering angle and the scattering behaviors of the cosmic ray unions after traversing deep underground are extensively studied by considering various energy loss modes; ionization loss, electron pair production, bremsstrahlung, and nuclear interaction. The rms angular dependences are studied as functions of incident muon energies a.t sea level and observed muon energies in underground detector at various depths. As the extreme case of the calculations, we can get Rossi & Greisen expression and Eyges expression which have been very familiar to cosmic ray field. The rms angle of scatterings of muons is almost determined by the minimum energy of muons which is able to penetrate rock overburden an underground detector. The calculated results are compared with the broad deflected angular spreads of muons from Cygnus X-3 which have been observed by Soudan detector at a depth of 1800 hg/cm^2 and Nusex detector at a depth of 5000 hg/cm2. Also, we compare and discuss our calculated root mean square angles of (θ^2)^<-1/2> scatterings of low energy electrons with the measured values of electrons in the energy region of 5 MeV-40 MeV from the neutrino burst of SN 1987A which have been done by Kamiokande and IMB groups.
近畿大学の論文
1990-01-30