An excited nucleus of iodine-131,

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

An excited nucleus of iodine-131, 53131I∗^{131}_{53}\text{I}^{\ast}, decays directly to xenon-131 in its ground state. Which of the following completes the nuclear equation below so that it satisfies conservation of nucleon number, charge, and lepton number? 53131I∗  ⟶  54131Xe+  ?^{131}_{53}\text{I}^{\ast}\;\longrightarrow\;^{131}_{54}\text{Xe}+\;? (a) β−\beta^{-} (b) β++νe\beta^{+}+\nu_e (c) β−+νˉe\beta^{-}+\bar{\nu}_e (d) β−+νˉe+γ\beta^{-}+\bar{\nu}_e+\gamma

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