Atmospheric neutrino flux calculation using the NRLMSISE00 atmospheric model
Abstract
In this paper, we extend the calculation of the atmospheric neutrino flux~hkkm2004,hkkms2006,hkkm2011 to the sites in polar and tropical regions. In our earliest full 3D-calculation~hkkm2004, we used DPMJET-III~dpm for the hadronic interaction model above 5~GeV, and NUCRIN~nucrin below 5~GeV. We modified DPMJET-III as in Ref.~hkkms2006 to reproduce the experimental muon spectra better, mainly using the data observed by BESS group~BESSTeVpHemu. In a recent work~hkkm2011, we introduced JAM interaction model for the low energy hadronic interactions. JAM is a nuclear interaction model developed with PHITS (Particle and Heavy-Ion Transport code System)~phits. In Ref.~hkkm2011, we could reproduce the observed muon flux at the low energies at balloon altitude with DPMJET-III above 32 GeV and JAM below that better than the combination of DPMJET-III above 5~GeV and NUCRIN below that. Besides the interaction model, we have also improved the calculation scheme according to the increase of available computational power, such as the "virtual detector correction" introduced in Ref.~hkkms2006 and the optimization of it in Ref.~hkkm2011. The statistics of the Monte Carlo simulation is also improved at every step of the work.
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