Hans Bethe joins the Los Alamos Laboratory and becomes the head of its theoretical division. He and his colleagues make crucial contributions to the feasibility and design of both the uranium and the plutonium bomb. He returns to Los Alamos for half a year in 1952.

In the fall of 1929 Sommerfeld recommends Bethe for a Rockefeller Foundation fellowship, as a consequence during 1930 Bethe spends a semester in Cambridge under the supervision of Ralph Fowler.

Hans Bethe dies of congestive heart failure in his retirement community home in Cayuga Heights, New York.

Hans Bethe receives a yearlong fellowship in Bristol with Neville Mott. In August 1934, Cornell offers Bethe a position as an acting assistant professor. Bethe agrees but he has already accepted the yearlong fellowship in Bristol. Cornell decides to let him start in the spring of 1935. In 1934, Bethe and Peierls develop a theory of the nucleus of the deuteron, which Bethe further extends in 1949.

Erwin Madelung offers Hans Bethe an assistantship in Frankfurt that he accepts.

Hans Bethe moves to USA and joins the faculty at Cornell University as Assistant Professor, then he is promoted to Professor in the summer of 1937. He stays there ever since, except for his sabbatical leaves and for an absence during World War II. In 1947, Bethe is the first to explain the Lamb-shift in the hydrogen spectrum, that leads to the foundation for the modern development of quantum electrodynamics.

Hans Bethe joins to the Radiation Laboratory at the Massachusetts Institute of Technology to work on microwave radar.

Paul Ewald offers an assistant position to Hans Bethe at the Technische Hochschule in Stuttgart.

Hans Bethe attends the 1935 and 1937 Washington Conferences. After Teller’s repeated urgings, Bethe takes part also to the 1938 meeting about problem of stellar energy generation. After his return to Cornell, Bethe starts investigating reactions involving heavier nuclei that would explain energy production in massive stars.

Hans Bethe is born in Strasbourg, Alsace-Lorraine. He is the only child of Anna (née Kuhn) and Albrecht Bethe, a privatdozent of physiology at the University of Strasbourg. Bethe starts reading at the age of four and begins writing at about the same age. His numerical and mathematical abilities manifest themselves early. At age fourteen he teaches himself calculus.

Hans Bethe receives his Habilitation and becomes Privatdozent at the University of Munich.

Hans Bethe enrols in the University of Frankfurt and takes courses in physics with Walther Gerlach, and in mathematics with Carl Ludwig Siegel. One of his teachers, the spectroscopist Karl Meissner, advises Bethe to go to Munich and study with Arnold Sommerfeld, an outstanding university physics teacher.

Hans Bethe receives the Nobel Prize in Physics "for his contributions to the theory of nuclear reactions, especially his discoveries concerning the energy production in stars".

Bethe returns to Rome. Scheel asks him to write an article for the Handbuch der Physik on quantum mechanics of hydrogen and helium. Bethe also aids Sommerfeld with the handbuch article on electrons in metals. This text covers the basis of the solid state physics. Both these articles show Bethe's gift of synthesis. Working on the handbuch articles occupies a lot of time, but he also writes a paper with Fermi on quantum electrodynamics, depicting the relativistic interactions of charged particles.

Bethe finds the reactions which supply energy in the stars, now called the Bethe (or Bethe-Weizsäcker) cycle, or more commonly, the carbon-nitrogen (or CNO) cycle. The most significant nuclear reaction in the brilliant stars is the CNO cycle, while the sun and fainter stars employ mostly the proton-proton reaction. Bethe establishes the absence of other possible nuclear reactions inside stars. The crowning achievement in this work comes in 1939 when he publishes a paper in Physical Review.

Hans Bethe holds a temporary position as Lecturer at the University of Manchester.

In 1935-1938 Hans Bethe studies the theory of nuclear reactions, predicting many reaction cross sections. Along with this work, Bethe develops Bohr's theory of the compound nucleus in a more quantitative way. This work and also the existing knowledge on nuclear theory and experimental results, is summarized in three important articles in the Reviews of Modern Physics which for many years serves as a textbook for nuclear physicists, an account that became informally known as Bethe's Bible.

Bethe joins Sommerfeld’s seminar in 1926. Here he meets Edward Condon, Carl Eckart, William Houston, Philip Morse, Linus Pauling, Isador Rabi, and Lloyd P. Smith. In 1927, Rudolf Peierls, a young German physics student, joins Sommerfeld’s seminar. Bethe and Peierls become great friends and close colleagues. In Munich, Bethe discovers his notable talents and proficiency in physics and anchors his self-confidence. His dissertation is about electron diffraction in nickel crystals.

Hans Bethe holds a position as Acting Assistant Professor of theoretical physics at the University of Tubingen. Due to the advent of the Nazi regime in Germany Bethe leaves this position in April 1933.

Hans Bethe spends a semester in Rome working with Enrico Fermi. Bethe develops the Bethe ansatz, a method for finding the exact solutions for the eigenvalues and eigenvectors of certain one-dimensional quantum many-body models. From now on his works are influenced by Fermi's simplicity and Sommerfeld's rigor in approaching problems.

Hans Bethe attends Goethe-Gymnasium in Frankfurt. By the time he finishes gymnasium in the spring of 1924 he knows he wants to be a physicist.

Hans Bethe writes Zur Theorie des Durchgangs schneller Korpuskularstrahlen durch Materie (The Theory of the Passage of Fast Corpuscular Rays Through Matter), a fundamental paper. Starting from Max Born's interpretation of the Schrödinger equation, Bethe produces a simplified formula for collision problems using a Fourier transform, which is known today as the Bethe formula. He submits this paper for his habilitation in 1930.

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