Measurement of anomalous nuclear reaction in deuterium-loaded metal

This paper reports on an experiment for testing natural nuclear fusionat low temperature searching for evidence of the origin of $^{3}$He fromnatural nuclear fusion in deep Earth. The experiment was carried outusing deuterium-loaded titanium foil samples and powder sample.Detection of charged particle was carried out using a low-levelcharged particle spectrometer. An Al foil was used as an energyabsorber for identification of charged particle. Although thecounting rate is very low in the experiment, the emission ofenergetic particle from the sample is observed and the particle isidentified as a proton having energy about 2.8,MeV after exiting thetitanium sample. This work provides a positive result for the emission ofcharged particle in the deuterium-loaded titanium foil samples atlow temperature, but a negative result for the deuterium-loadedtitanium powder sample. The average reaction yield is deduced to be(0.46$pm $0.08) protons/h for the foil samples. With the suggestion that theproton originates from d--d reaction, we calculate the reaction ratefor d--d reaction, and the obtained result is 1.4$times $10$^{ - 24}$fusion/d--d$cdot $sec. The negative result of the deuterium-loadedtitanium powder sample suggests that the reaction yield might becorrelated with the density or microscopic variables ofdeuterium-loaded titanium materials. The negative result alsoindicates that d--d reaction catalysed by $mu $-meson from cosmicray can be excluded in the samples in this experiment.