Monte Carlo simulations using some nuclear interaction models on solar neutron propagation in the Atmosphere

Details Monte Carlo simulations using some nuclear interaction models on solar neutron propagation in the Atmosphere Monte Carlo simulations using some nuclear interaction models on solar neutron propagation in the Atmosphere

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3077k&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

Tibet ASγ group constructed a new type of solar neutron telescope at Yangbajing (606 g/cm2 ) in 1998. Monte Carlo simulations on the propagation of solar neutrons through the Earth's atmosphere has been done in order to evaluate the performance of the detector for solar neutrons. Two kinds of the nuclear cascade models were used in Monte Carlo calculations. One is the intranuclear cascade evaporation model by using CALOR89 and another is nuclear cascade model developed by STE Laboratory in Nagoya university group. The attenuation of neutrons in the atmosphere at the observational site were estimated using two simulation code. The survival ratio of neutron calculated by CALOR 89 is approximately two times larger than Nagoya-model above 200 MeV. The detection efficiency for solar neutron was also estimated by CALOR89 as 25 ˜ 40 % in the energy region from 100 MeV to 1500 MeV. Finally the sensitivity of Tibet neutron telescope for the neutron produced by solar flare was studied by using CALOR89. We found that Tibet neutron telescope has the good performance of getting solar neutrons with high significance of more than 50 σ for the flare with neutron emissivity spectrum; dI dE = 1.0 × 1027 × ( E 100 )-4 [MeV-1 sr-1 s-1 ].

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