Abstract
Relativistic electrons, generated in the interaction of an ultra-intense laser pulse with plasma in front of a high-Z solid target, when passing near the nuclei of the solid target produce several MeV highly collimated Bremsstrahlung gamma beam, which can be used to induce photo-nuclear reactions. In this work the possibility of photo-induced transmutation (γn) of a nuclear waste of 126Sn with a half-life of 100,000years into 125Sn with a half-life of 9.64days was investigated for the first time. Calculations based on the available experimental data show that the Bremsstrahlung γ beam generated by irradiating a 2mm thick tantalum target as a converter with 1020Wcm-2μm2 and 10Hz table-top laser for an hour can produce 293Bq activity in a 1cm thick 126Sn sample placed directly behind it. The remarkable feature of this work is to evaluate the optimal laser intensity to produce maximum activity of 2257Bq which is 1.18×1021Wcm-2μm2. The selective excitation of nuclear resonance states are discussed by studying the rate equations and calculating the Einstein coefficient. According to our calculations, we achieve relative decay rate of 0.0025, for two possible decay channels. Our results show the most probable channel for this mechanism which has a good agreement with direct excitation process.
Published Version
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