Calculations of Neutron Yield and Gamma Rays Intensity by GEANT4

The possibility of obtaining neutron beams using the extracted proton beam of a cyclotron C18/18 was investigated. The calculation of neutron spectra from protons on 9Be target neutron source was performed by GEANT4 application. Anaccompanying gamma yield was simulated also. A comparison of the spectra of neutrons and gamma rays to determine the optimal conditions for the effective suppression of gamma background in future experiments was done. The methods of suppression gamma were considered. The absorber material and its optimal thickness were determined by GEANT4 calculations.