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((Short description|French Physicist))
((about|the Polish-French physicist|the Polish-French biologist|Jean Danysz (biologist)))
((refimprove|date=August 2013))
[[File:Jan Kazimierz Danysz.jpg|thumb|Jan Kazimierz Danysz]]
'''Jean Danysz''' (11 March 1884 &ndash; 4 November 1914) born '''Jan Kazimierz Danysz''', was a French physicist of [[Poland|Polish]] extraction. He was an assistant of [[Maria Sklodowska-Curie|Maria Skłodowska-Curie]] and notable in the development of [[Beta decay|beta]] spectrometry.

Danysz made considerable advances on the [[Spectrometer|magnetic deflection]] techniques of [[Otto von Baeyer|Baeyer]], [[Otto Hahn|Hahn]] and [[Lise Meitner|Meitner]], placing the source (he used radium) in a capillary tube under a slit, with a photographic plate in the same horizontal plane. By this means the known number of lines (later understood to be [[Internal conversion|conversion lines]]) superimposed on the beta energy spectrum of RaB + RaC went from 9 to 27 (later work by [[Harold Roper Robinson|Robinson]] and Rutherford found 64; 16 from RaB and 48 from RaC).<ref>RaA was a placeholder for an isotope later identified as <sup>218</sup>Po; RaB for an isotope later identified as <sup>214</sup>Pb - see [[Radium series]]</ref> He finished his doctoral thesis in 1913, and by 1914 he was considered by [[Ernest Rutherford|Rutherford]] as a leading researcher into [[beta decay]],<ref>Jensen, Carsten (editor) ''Controversy and Consensus: Nuclear Beta Decay 1911-1934'' Chapter 2.4 Deflection experiments. p. 37</ref> but he did no further work. He enlisted in the French army in 1914 and  was killed in action near [[Cormicy]].<ref>[http://vlecalvez.free.fr/Jean_Danysz.html Extract from ''Livre d'or de l'École de physique et de chimie'']</ref>

==Publications==
J. Danysz, Le Radium 9, 1 (1912); 10, 4 (1913)

Danysz, J. ''Recherches expérimentales sur les β rayons de la famille du radium'' Ann. Chim. Phys. 30 (1913) 241&ndash;320

==Family==
* He was the son of biologist [[Jean Danysz (biologist)|Jean Danysz]] (1860-1928).<ref>''Bulletin littéraire et scientifique'' (Association des anciens élèves de l'Ecole polonaise) - 1914/12/15 (Année 39, N°316)</ref>
* He was the father of physicist [[Marian Danysz]] (1909–1983).

==References==
((Reflist))

((Authority control))
((DEFAULTSORT:Danysz, Jan Kazimierz))
[[Category:1884 births]]
[[Category:1914 deaths]]
[[Category:20th-century French physicists]]
[[Category:French Army soldiers]]
[[Category:French military personnel killed in World War I]]


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