Abstract
Present status of cold fusion research is reviewed after almost nine yearsof its discovery. It is recognized that the events of the cold fusion phenomenonoccurring at from room temperature up to about 3000°C include not inlyinitially supposed excess heat, neutron and tritium generations but also heliumand gamma ray generations and the nuclear transmutation of the heavier nuclei.The experimental evidences of these events have been almost confirmed.and primitive application devices have been worked out but theoretical explanationof the phenomenon is not accomplished yet. A trial of consistent explanationfor the whole experimental data is introduced in the final section.
