Altitude and Latitude Distribution of the Production Rate of 7Вe in the Earth’s Atmosphere in the PARMA Model

The contribution of spallation reactions on protons and neutrons to the production of the cosmogenic isotope 7 Be 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 7 Ве production comes from the reaction 14 N 7 (n, X) 7 Be 4 . It is determined that 7 Ве production increases as one approaches the poles. Results of the PARMA model are in overall agreement with earlier empirical and semi-empirical models.