{"knowledge_schema": {"broad_category": "Physics \u2192 Particle Physics \u2192 Decay Processes", "refinement": "This problem involves the conservation of energy and momentum in particle decay, specifically focusing on the decay of a neutral pion into two photons.", "specific_scope": "The context is the rest frame of the neutral pion, where the total energy before decay is equal to the total energy after decay.", "goal": "Calculate the energy of each photon resulting from the decay of the neutral pion."}, "summary": "In this particle decay process, a neutral pion decays into two photons, and we need to determine the energy of each photon in the rest frame of the pion. Given that the rest mass energy of the pion is 135 MeV, and applying the conservation of energy, we find that the total energy of the system before decay (135 MeV) is distributed equally between the two photons after decay. Therefore, each photon has an energy of 67.5 MeV."}