The framework of this work is to show, the phenomena of formation of particle and antiparticle in pair production when energy of suitable photon incidence or reach to positive nucleus field of an atom. In this phenomena before the formation of antiparticle and particle the energy of photon is converted into mass and due to charge of nucleus this formation mass goes on dipole formation, such formation is take place in weak positive nucleus filed. After the formation of dipole the orientation of positive part of mass is away from nucleus central field and negative part is towards the center of positive nucleus field. On going the formation mass with dipole towards the strong nucleus field, the repulsive force between of positive charge of mass i.e. antiparticle formation part, and positive charge nucleus is greater than that of attractive force of antiparticle part and particle part of mass having dipole, formed from incidence photon. Moreover, the formation of antiparticle is first, take place at the boundary of weak nucleus field and strong nucleus field. After the formation of antiparticle formation of particle part is separated and goes on repulsion on repulsive nucleus field. Hence in this way we can explain the phenomena of formation of particle and antiparticle in pair production and leaving from atom or positive charge field of nucleus. Keywords-Suitable photon, Formation of mass, Weak nucleus field, Strong nucleus field, Repulsive nuclear field, particle and antiparticle etc.Note: Particle is negatively charge and antiparticle is positively charge in our assumption.
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