1891 – Walther Bothe was born on the 8th of January in Oranienburg near Berlin.
1908-1912 – He studied physics at the University of Berlin under Max Planck,
1920 – Bothe taught at the University of Berlin.
1924 – Bothe’s coincidence circuit was one of the first AND logic gates. Bothe studied the Compton effect using such a set up, thus establishing the modern analysis of scatter processes.
– Bothe used the coincidence method to discover penetrating radiation coming from the upper atmosphere; this radiation is now known as cosmic rays.
1927 – Bothe began applying the coincidence method to the transmutation of light elements by the bombardment with alpha particles.
1930 – He found that the radiation emitted by beryllium when it is bombarded with alpha particles was a new form of penetrating high energy radiation, which was later shown by James Chadwick to be neutrons.
1931 – He taught at the University of Giessen.
1932 – He was appointed Director of the Institute of Physics at the University of Heidelberg, succeeding Philipp Lenard.
1938 – Wolfgang Gentner and Bothe published a paper on the energy dependence of the nuclear photo-effect, which was the first decisive evidence that the absorption spectra of nuclei are accumulative and continuous.
1941 – Bothe and Peter Jensen reported the results of testing on neutron absorption in graphite. However, their erroneous conclusions contributed to stifling the German nuclear program in World War II.
1943 – Bothe completed Germany’s first cyclotron, and was awarded the Max Planck medal.
1957 – He died on the 8th of February.