MOSSBAUER, RUDOLF LUDWIG

born Jan. 31, 1929, Munich, Ger. Rudolf Ludwig Mssbauer. German physicist and winner, with Robert Hofstadter of the United States, of the Nobel Prize for Physics in 1961 for his discovery of the Mssbauer effect. Mssbauer discovered the effect in 1957, one year before he received his doctorate from the Technical Academy of Munich. Under normal conditions, atomic nuclei recoil when they emit gamma rays, and the wavelength of the emission varies with the amount of recoil. Mssbauer found that at a low temperature, a nucleus can be embedded in a crystal lattice that absorbs its recoil. The discovery of the Mssbauer effect made it possible to produce gamma rays at specific wavelengths, and this proved a useful tool because of the highly precise measurements it allowed. The sharply defined gamma rays of the Mssbauer effect have been used to verify Albert Einstein's general theory of relativity and to measure the magnetic fields of atomic nuclei. Mssbauer became professor of physics at the California Institute of Technology, Pasadena, in 1961. Three years later he returned to Munich to become professor of physics at the Technical Academy.