Momentum correlations in the two-proton decay of light nuclei

Momentum correlations in two-proton and other multi-body decays of light proton-rich nuclei are discussed. The variety of such decays are illustrated by a number of examples. The measured correlations for the ground state of Be-6 are found to be consistent with the cluster-model calculations of Grigorenko et al. The ground state of C-8 decays by two sequential steps of 3-body (two-proton) decay passing through the Be-6(g.s.) intermediate state. The isobaric analog of C-8 in B-8 undergoes two-proton decay to the isobaric analog state in Li-6. To the extent that isospin is conserved, this is a Goldansky-type decay, i.e. the isospin-allowed immediate state in Be-7 is energetically forbidden. An excited state in C-10 is found to have a similar to 50% four-body-decay branch where the protons have a strong diproton character.