Physics

Problem

A nucleus of

^{14}_{6}\text{C}

undergoes beta-minus decay to form

^{14}_{7}\text{N}

. Write the symbol of the lepton that must be added to the reaction

^{14}_{6}\text{C} \;\to\; ^{14}_{7}\text{N} + e^- + \;?

so that all conservation laws are satisfied.