The alpha particle spectra from the $\mathrm{T}(t, \alpha )n, n$ reaction have been measured at a laboratory angle of 30° for triton energies ranging from 0.95 to 2.10 Mev and at laboratory angles of 30°, 60°, 90°, and 120° for 1.9-Mev incident tritons. Absolute cross sections are obtained. Analysis of the spectra in terms of a two-stage process involving the formation and breakup of ${\mathrm{He}}^5$ is discussed. Evidence for neutron-neutron correlation is observed but no evidence is found for a bound dineutron.

• Received 25 April 1958

DOI:https://doi.org/10.1103/PhysRev.111.1121