2011年9月22日 · Pons and Fleischmann originally reported in 1989 that their chemical cells had produced excess heat, neutrons, and tritium. Their interpretation was that deuterium nuclei were fusing to produce 4He. The branching ratios in this process are known: 50% n+3He, 50% p+3H, and 10^-6 4He+gamma.

$\begingroup$ @Jonathan. : good question. The neutron doesn't even know what its end state should be. At the quantum scale, things literally don't stay put.