Physics of auroral phenomena : proceedings of the 33rd Annual seminar, Apatity, 02 - 05 March, 2010 / [ed.: A.G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2011. - 206 с. : ил.

E.A. Maurchev at al. For incident on NM low-energy neutrons the response is insignificant because o f their reflection from an external layer of polythene. The reflection is a result o f process o f elastic collision on nuclei o f hydrogen or inelastic collision through reaction (n, y). Above the energy 9 MeV a response function of NM64 monotonously increases with increase in energy of incident neutrons, owing to formation of secondary neutrons at inelastic collision with heavy nuclei o f lead surrounding counters. For this energy range the class of physical processes G4BinaryCascade was used. Conclusions A modeling and calculation of a response function of the standard neutron monitor NM-64 to various species of secondary cosmic rays with a software package GEANT4 were carried out. The results of a NM response function calculations for the neutron energy range from 10 ' 7 MeV up to 10 5 MeV are presented. The obtained results are in the good agreement with similar calculations o f other authors executed the last years and with use o f other techniques. R eferences 1. http://geant4.web.cem. ch/geant4/support/download.shtml 2 . http://www.nndc.bnl.gov/csewg/ 3. http://www.geant4.org/geant4/support 4. Clem J.M., Dorman L.I. Neutron Monitor Response Function. // Space Sci. Rev. 2000. V. 93 (1). P. 335-359. 5. C. Pioch, V. Mares, W. Rtihm, E.A. Maurchev, E. V. Vashenyuk, Yu. V. Balabin Measurement of secondary neutrons from cosmic radiation at 79° N —a combined analysis of data from a Bonner spheres spectrometer and a neutron monitor ( 2 0 1 0 to be published elsewhere) 6 . Dorman L.I., Experimental and Theoretical Principles of Cosmic Ray Astrophysics. //M. Nauka. 1975. 464 p. 86