BEXCO - Room F(201/202/203/204)
[CRD056] Precision Measurement of Nitrogen Flux in Cosmic Rays with the Alpha Magnetic Spectrometer on the International Space Station
Nitrogen nuclei in cosmic rays are believed to be produced both in the supernova and by collisions of heavier nuclei, such as oxygen, with interstellar matter. Knowledge of the rigidity dependence of the nitrogen flux is important in understanding of the propagation of both primary and secondary cosmic rays. A precision measurement of the nitrogen flux from 2 GV to 3 TV is presented based on 2 million events collected by AMS in the first five years of operation. The extended rigidity range and the accuracy of the data (up to factor 2 difference with the earlier results of other experiments) provide, for the first time, accurate knowledge the behaviour of the nitrogen flux. In particular, the detailed variation with rigidity of the nitrogen flux spectral index is reported.