In order to examine the necessary condition to induce an intense“deuterium-reaction”within solids under the same electrolyte (D
2O) and electrolytic current, both [DS-D
2O] cell and [Bulk-D
2O] cell having the same size“cathode”were electrically connected in series as a [Double-cell] to duplicate the experimental condition. The [DS-D
2O] cell was constructed with a“DS-cathode”(Double Structure Cathode with an inner cathode of fine powders) and the [Bulk-D
2O] cell with a“Bulk-cathode”made of bulk solid. Both intense“excess-energy”and“helium”are induced as a reaction product in [DS-D
2O] cell, but it becomes very difficult in [Bulk-D
2O] cell.
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