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VOLUME 32 | ISSUE 9 | PAGE 572
Emission of β+-delayed pairs of protons and doubly β+ -delayed protons and a particles
In addition to the two types of radioactive decay with the emission of nucleon pairs that were predicted in 1960—two-proton radioactivity so far not observed experimentally and the β "-delayed neutron pairs first observed in 1979—an emission of β +-delayed proton pairs is possible. A list of probable examples is presented. The emission of doubly β +-delayed protons and a particles, in particular, the doubly β + -delayed, proton-radioactive decays from an excited nuclear state, should be observed after a chain of two β + -decay events.