S. A. Stephens

Production spectrum of gamma rays in interstellar space through neutral pion decay

We have obtained a simple representation to the observed invariant cross-section for the production of neutral pions in proton-proton collisions. Making use of this representation, we have calculated the differential and integral production spectra of gamma rays in the Galaxy from interactions of cosmic ray nuclei with interstellar gas. It is shown that the uncertainties in deducing interstellar proton spectrum by demodulating the observed spectrum do not affect very much the gamma ray spectrum. We have also determined the gamma ray production spectrum through bremsstrahlung process for a typical interstellar electron spectrum derived from the radio spectrum in the Galaxy. From these, the total gamma ray production spectrum resulting from the interaction of cosmic rays with interstellar matter is compared with the observed gamma ray spectrum in the Galaxy and some inferences have been obtained. We also point out the possible uncertainty in the present calculation and suggest the improvements needed.

Secondary production of antiprotons in cosmic radiation

AbstractA reliable representation to the invariant cross-section for the production of antiprotons (n

Atmospheric gamma rays in the energy region 40–1000 GeV

bar P

Radio-emitting electrons and cosmic ray confinement

n) in inclusive reactions has been obtained, which fits the data extremely well from threshold to ISR energies. Using this, the production spectrum ofn

An analysis of the longitudinal distribution of gamma rays from SAS-II data

bar P

ON THE EXISTENCE OF THE GALACTIC RADIO HALO.

n by cosmic ray interaction with interstellar gas is calculated and is compared with other existing calculations. The equilibrium spectrumn