During the 1940s and 1950s, the studies continued on the 𝛽 decays. It was found that not all 𝛽 decays occur between nuclear states with identical angular momenta, so the Fermi allowed transitions defined in Section 21.3, which represent a 𝛥𝐽 = 0 operator (see Eq. (21.31)), could not be a complete description.
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