Beta-Decay ofBe10and Theory of Beta-Decay

If a spin change of three units is involved in the ${\mathrm{Be}}^{10}$→${\mathrm{B}}^{10}$ transition—as seems to be indicated at present—theoretical predictions of the minimum half-life lead to an essentially unique betaray spectrum very different from the allowed shape. Measurement of this spectrum will provide a crucial test of existing theories of beta-decay.