By ${\mathrm{H}}^3$ bombardment, two neutrons have been introduced into Rh and Co nuclei according to reactions ${\mathrm{Rh}}^{103}({\mathrm{H}}^3,p){\mathrm{Rh}}^{105}$ and ${\mathrm{Co}}^{59}({\mathrm{H}}^3,p){\mathrm{Co}}^{61}$, with half-lives of 35 hours and 1.75 hours, respectively. The mechanism appears to be an Oppenheimer-Phillips process with ${\mathrm{H}}^3$. The results are interpreted in the light of the di-neutron (${}_0{}^{}{}_{}{}^{}n_{}^2{}_{}{}^{}$). It is believed that ${}_0{}^{}{}_{}{}^{}n_{}^2{}_{}{}^{}$ may exist under the physical conditions of the experiments reported.

• Received 24 September 1947

DOI:https://doi.org/10.1103/PhysRev.73.22