Heisenberg's critical mass calculations for an explosive nuclear reaction |
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| Institution: | 1. Departamento de Física, Universidade Federal da Paraíba, Caixa Postal 5008, CEP 58051-970, João Pessoa, PB, Brazil;2. Centro de Ciências, Tecnologia e Saúde, Universidade Estadual da Paraíba, CEP 58233-000, Araruna, PB, Brazil;1. Physics Department “G. Occhialini” of Milano-Bicocca University, piazza della Scienza 3, Milano 20126, Italy;2. INFN section of Milano-Bicocca, piazza della Scienza 3, Milano 20126, Italy;3. Laboratorio Energia Nucleare Applicata (L.E.N.A.) of the University of Pavia, via Aselli 41, Pavia 27100, Italy;4. INFN section of Pavia, via A. Bassi 6, Pavia 27100, Italy;5. Politecnico di Milano, Department of Energy, CeSNEF (Enrico Fermi Center for Nuclear Studies), via La Masa 34, 20156 Milano, Italy;1. Department of Physics, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran;2. Radiation Application Research School, Nuclear Science & Technology Research Institute, P.O. Box 11365-3486, Tehran, Iran |
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| Abstract: | Based on the declassified records of Heisenberg's Farm-Hall “lecture”, we are attempting in the present work to follow Heisenberg's thoughts and results and show in a more transparent way how he arrived at his surprisingly quite accurate estimation of the critical mass of a reflected U235 sphere undergoing explosive neutrons fission. We conclude with a discussion regarding the contraversy concerning the so-called German Uranium bomb and the role played by Heisenberg and C.F. von Weizsäcker in this connection during and after the war. |
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