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2 giorni fa · At Los Alamos, Feynman was assigned to Hans Bethe's Theoretical (T) Division, and impressed Bethe enough to be made a group leader. He and Bethe developed the Bethe–Feynman formula for calculating the yield of a fission bomb, which built upon previous work by Robert Serber. As a junior physicist, he was not central to the project.
4 giorni fa · In 1931 Hans Bethe introduced an ansatz for the eigenstates of the antiferromagnetic Heisenberg Hamiltonian in a closed spin-1/2 chain [1]. This ansatz involves the summation of permutations of plane waves, with their quasi-momenta coupled through transcendental equations known as Bethe equations.
14 ore fa · To review this work and the general theory of fission reactions, Oppenheimer and Fermi convened meetings at the University of Chicago in June and at the University of California in July 1942 with theoretical physicists Hans Bethe, John Van Vleck, Edward Teller, Emil Konopinski, Robert Serber, Stan Frankel, and Eldred C. (Carlyle ...
14 ore fa · Bethe noted that a tritium-deuterium (T-D) reaction releases five times as much energy as a deuterium-deuterium (D-D) reaction. This was not immediately followed up, because tritium was hard to obtain, and there were hopes that deuterium could be easily ignited by a fission bomb, but the cross sections of T-D and D-D were measured by Manley's group in Chicago and Holloway's at Purdue.
5 giorni fa · The next morning, Naomi announced that Hans (Bethe, Nobel Laureate, Head of Theoretical Division) wanted to see me. All the way up the stairs to the second floor I was thinking, “Oh, oh. This is it. You should not have told where you were born.” Hans was very pleasant, proceeded to ask me if I knew about any problems in the IBM Computation ...
4 giorni fa · A perspectiva da “ignição atmosférica” causou discordância entre os cientistas: Edward Teller estava preocupado com isso; Hans Bethe estava convencido de que era impossível; os outros dez ficaram no meio termo.
4 giorni fa · The Bethe ansatz represents an analytical method enabling the exact solution of numerous models in condensed matter physics and statistical mechanics. When a global symmetry is present, the trial wavefunctions of the Bethe ansatz consist of plane wave superpositions.
