Theodor Sexl

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Theodor Sexl (born November 8, 1899 in Vienna ; † 1967 ) was an Austrian theoretical physicist who dealt with hydrodynamics and nuclear physics .

Life

Sexl studied mathematics and physics at the University of Vienna with his doctorate in 1923. At the University of Vienna he was a student of Felix Ehrenhaft and, under his influence, dealt with hydrodynamics and statistical physics, first with a theory of the forces acting on a radiometer . This led to a scholarship to the Institute for Aerodynamics of the TH Aachen with Theodore von Kármán and Ludwig Hopf . There he dealt with the stability of the Poseuille flow in pipes and predicted an annular effect (pulsar effect of laminar flow in circular cylinder pipes), which was found experimentally by Edward Gick Richardson (1896–1960). Sexl became an assistant at the Institute for Theoretical Physics at the University of Vienna with Hans Thirring and turned to quantum mechanical scattering theory and nuclear physics (for example, scattering of alpha particles on nuclei with Eugen Guth (1905–1990), later known as Eugene Guth). He completed his habilitation in 1930 quantum mechanical treatment of nuclear physics and gave lectures on it in the summer semester of 1931 in Vienna. He later became a full professor in Vienna. He published around 70 scientific papers and supervised around 30 doctoral students.

He was the uncle of Roman Sexl .

Fonts

In addition to the writings cited in the footnotes:

  • On the question of the electrical charges of submicroscopic test specimens . In: Journal of Physics . tape 16 , no. 1 , December 1, 1923, p. 34-41 , doi : 10.1007 / BF01327375 .
  • On the question of the electrical charges of submicroscopic test specimens. II . In: Journal of Physics . tape 26 , no. 1 , December 1, 1924, p. 371-378 , doi : 10.1007 / BF01327340 .
  • On the gas-theoretical justification of the Stokes-Cunningham formula . In: Annals of Physics . tape 81 , no. 24 , January 1, 1926, p. 855-865 , doi : 10.1002 / andp.19263862407 .
  • About some integrals of the differential equation characteristic of the axially symmetrical flows in pipes . In: Annals of Physics . tape 87 , no. 20 , January 1, 1928, p. 570-580 , doi : 10.1002 / andp.19283922007 .
  • On the stability question of the Poiseuille and Couette currents . In: Annals of Physics . tape 83 , no. 14 , January 1, 1927, p. 835-848 , doi : 10.1002 / andp.19273881405 .
  • About three-dimensional perturbations of the Poiseuille flow . In: Annals of Physics . tape 84 , no. 22 , January 1, 1927, p. 807-822 , doi : 10.1002 / andp.19273892208 .
  • On the quantum theory of the atomic nucleus . In: Journal of Physics . tape 54 , no. 5-6 , May 1, 1929, pp. 445-448 , doi : 10.1007 / BF01375466 .
  • On the quantitative theory of radioactive α-emission . In: Journal of Physics . tape 81 , no. 3–4 , March 1, 1933, pp. 163-177 , doi : 10.1007 / BF01338362 .
  • About the scattering of fast particles on atomic nuclei . In: Acta physica Austriaca . tape 1 . Springer, 1947, p. 178-187 .
  • Lectures on nuclear physics. Deuticke, Vienna 1948.

literature

  • Peter Urban: Theodor Sexl 65 years . In: Physics Journal . tape 20 , no. 11 , November 1, 1964, pp. 532-532 , doi : 10.1002 / phbl.19640201107 .

Individual evidence

  1. ↑ Theodor Sexl: Supplement to B. Baule “Theoretical treatment of the phenomena in dilute gases” . In: Annals of Physics . tape 80 , no. 13 , January 1, 1926, p. 515-523 , doi : 10.1002 / andp.19263851305 .
  2. ↑ Theodor Sexl: On the theory of radiometer effects II . In: Annals of Physics . tape 81 , no. 24 , January 1, 1926, p. 800-806 , doi : 10.1002 / andp.19263862403 .
  3. ↑ Theodor Sexl: On the theory of the single-plate radiometer . In: Journal of Physics . tape 52 , no. 3–4 , March 1, 1929, pp. 249-262 , doi : 10.1007 / BF01342400 .
  4. ^ Theodor Sexl: About the "Annular Effect" discovered by EG Richardson . In: Journal of Physics . tape 61 , no. 5-6 , May 1, 1930, pp. 349-362 , doi : 10.1007 / BF01340631 .
  5. ↑ Eugen Guth, Theodor Sexl: On the anomalous scattering of α-particles on light nuclei . In: Journal of Physics . tape 66 , no. 9-10 , September 1, 1930, pp. 577-580 , doi : 10.1007 / BF01421119 .
personal data
SURNAME Sexl, Theodor
BRIEF DESCRIPTION Austrian theoretical physicist
DATE OF BIRTH November 8, 1899
PLACE OF BIRTH Vienna
DATE OF DEATH 1967