Analysis of Nuclear Transmutation Induced from Metal Plus Multibody-Fusion-Products Reaction

Nuclear transmutation has been reported by lots of experiments. The features of this phenomenon are the production of elements which shows fission-like distribution and their anomalous isotopic ratios or the selective Z and mass changes [1]. To analyze this phenomenon, the selective channel scission (SCS) model has been proposed and improved [2]. The SCS model is powerful and can predict the fission product yields of any elements’ fission. The fission product yields are calculated as follows. At first, we consider all fission channels, which are possible combinations of atomic and mass numbers. The value of channel-dependent fission barrier Ef is estimated by the Q-value of the fission channel and the bare Coulomb potential Ec at the effective scission distance Reff. The Reff is obtained by setting the jointing factor η which reflects the jointing force of strong interaction: Reff = η (R1 + R2), where R1 and R2 are the radiuses of the fission fragments. For the channel, the tunnel fission probability, that is the channel-opening probability, is calculated. If the nuclear excitation energy Ex is less than Ef, the tunnel fission probability needs to be considered. On the other hand, this value is 1 if the Ex is more than Ef. Then, the fission product yield is obtained by summing up these probabilities all over fission channels. These processes of the calculation are introduced in the previous paper in detail [2]. We have analyzed the nuclear transmutation, assuming photo-fission of cathode material, such as Pd, excited by multi-photon process. This time, the nuclear transmutation is analyzed as fissions from secondary reactions of multi-body fusion [3] in addition to photo-fission.