Consider the decay of a free neutron at rest:n→p+ e– Show that the two-body decay of this type must necessarily give an electron of fixed energy and, therefore, cannot account for the observed continuous energy distribution in theβ-decay of a neutron or a nucleus (Fig. 6.19). [Note: The simple result ofthis exercise was one among the several arguments advanced by W. Pauli to predict the existence of a third particle in the decay products ofβ-decay. This particle is known as neutrino. We now know that it is a particle of intrinsic spin ½ (likee–,porn), but is neutral, and either massless or having an extremely small mass (compared to the mass of electron) and which interacts very weakly with matter. The correct decay process of neutron is:n→p + e–+ ν]

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