Cosmic-Ray Source Generator

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Presentation transcript:

Cosmic-Ray Source Generator Y.Fukazawa (Hiroshima U) M.Ozaki(ISAS) T.Mizuno(Hiroshima U) S.Hirano(Hiroshima U) T.Kamae(Hiroshima U/SLAC)

Cosmic-Ray Source Generator is required for (Simulator) ・Balloon Flight Calibration to predict a counting rate of π0 decay Gamma-ray and Background ・Science Analysis after launch to simulate and estimate the onboard background especially for study of diffuse gamma-ray emission detection of faint gamma-ray sources

Cosmic-Ray accelerated by young SNRs, Pulsars, or other sites propagate in the interstellar space modulated by Solar Wind cut-off by magnetic field of the Earth Generation of secondary components in the Air inject into satellites or balloons become the residual background by primary electrions or secondary particles and gamma-rays

Protons AMS Measurements ….. Primary and Secondary for various geomagnetic latitude

40E-2.79exp(-(E/20)-0.1-(E/3.96)-2.5) Primary 3x10-3E-2.5exp(-(E/0.16)-1) Secondary

Electrons Information is not so enough as protons Primary Electrons Secondary Komori et al. 1999 Verma et al. 1967

Solar modulation formula (Gleeson and Axford 1968) Primary Komori 1999 Solar modulation formula 0.723(E+1.1)-3.33x((E+mc2)2-(mc2)2)/((E+mc2+(1.1)2)/(1+(E/4.27)-12.0 geomagnetic cutoff Verma et al. Secondary modified 0.028E-1.44/(1+(E/0.90)1.35) … re-entrant 0.073E-1.29/(1+(E/0.90)1.50) … splash

Incident Angle Distribution (1+0.6sin(theta)) sin(theta)d(theta) Pimary … theta<90°

Summary Current Status Supporting the Balloon Flight experiments (various parameters are fixed for the balloon). Further developements ….. Support arbitral solar modulation and geomagnetic cutoff. Include Helium and other ions. Improve the incident angle distribution (theta, phi). Improve the secondary components (intensity etc) Parallel Studies Residual background due to the cosmic-rays