ALTITUDE AND LATITUDE DISTRIBUTION OF THE PRODUCTION RATE OF Be-7 IN THE EARTH'S ATMOSPHERE IN THE PARMA MODEL

摘要

The contribution of spallation reactions on protons and neutrons to the production of the cosmogenic isotope Be-7 is analyzed on the basis of calculations of a nuclear-electromagnetic cascade in the atmosphere in the analytical model PARMA, along with its latitude and altitude dependences. It is shown that the main contribution to Be-7 production comes from the reaction N-14(7)(n, X)Be-7(4). It is determined that Be-7 production increases as one approaches the poles. Results of the PARMA model are in overall agreement with earlier empirical and semi-empirical models.