Enhanced tritium production in irradiated TiD2 from collisional fusion in the solid-state

Ongoing research in new nuclear mechanisms hold the potential for beneficial developments in nuclear power cycle designs. Recent reports investigated the possibility of lattice dynamics to influence nuclear processes in metals. Results from Steinetz et al., at the NASA Glenn Research Center indicated that it may be feasible to initiate deuterium-deuterium fusion reactions that are enhanced using electron screening to reduce the deuterium-deuterium fusion barrier. This article presents tritium production results from both simulations and experiments targeting specific nuclear processes in an effort to identify the source of higher-energy neutrons observed in those results. We explore two pathways of tritium generation in TiD 2 through this fusion cycle. Tritium production from TiD 2 in the University of Missouri Research Reactor (MURR), where the neutron spectrum was ∼90 % thermal, was within 25 % of the predicted amount from simulations, and well-explained by known nuclear reactions without invoking screening-enhanced recoil-induced fusion. Tritium production from TiD 2 in the cyclotron vault at MURR, where the neutron spectrum was completely energetic with almost no thermal neutrons, was a factor of 2.9–5.1 times higher than predicted from simulations using known nuclear reactions. This indicates the likelihood of an additional mechanism, such as collision-induced fusion in the solid state, increasing the credibility in the results from Steinetz et al.