Anomalously High Isotope Ratio ³He/⁴He and Tritium in Deuterium-Loaded Metal: Evidence for Nuclear Reaction in Metal Hydrides at Low Temperature

Anomalous ³He/⁴He ratios in deuterium−loaded titanium samples are observed to be about 1– 4×10⁻¹, much greater than the values (≤10⁻⁴) in natural objects. Control experiments with the deuterium-unloaded titanium sample and original industrial deuterium gas are also carried out, but no anomalous ³He/⁴He values are observed. In addition, anomalous tritium in deuterium−loaded titanium samples are also observed. To explain the excess ³He and tritium in the deuterium-loaded titanium samples, it is required that the deuteron-induced nuclear reaction occurs in the samples at low temperature.