γγ Coincidence Study of Electromagnetically Forbidden, 0 − → 0 +, Transition in 4He

Abstract

The purpose of this thesis is figuring out the properties of X17 particle by searching for the γγ decay of this particle produced in nuclear transitions. The coincident double γ radiation of an electromagnetically forbidden , 0 − → 0 + , transition of helium-4 ( 4 He) is studied in order to distinguish between the vector or the pseudoscalar boson scenario.