Jean Danysz (11 March 1884 – 4 November 1914) born Jan Kazimierz Danysz, was a French physicist of
Polish
Polish may refer to:
* Anything from or related to Poland, a country in Europe
* Polish language
* Poles
Poles,, ; singular masculine: ''Polak'', singular feminine: ''Polka'' or Polish people, are a West Slavic nation and ethnic group, w ...
extraction. He was an assistant of
Maria Skłodowska-Curie
Marie Salomea Skłodowska–Curie ( , , ; born Maria Salomea Skłodowska, ; 7 November 1867 – 4 July 1934) was a Polish and naturalized-French physicist and chemist who conducted pioneering research on radioactivity. She was the first ...
and notable in the development of
beta spectrometry.
Danysz made considerable advances on the
magnetic deflection
In physics, deflection is a change in a moving object's velocity, hence its trajectory, as a consequence of contact (collision) with a surface or the influence of a non-contact force field. Examples of the former include a ball bouncing off the ...
techniques of
Baeyer,
Hahn and
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
conversion lines) superimposed on the beta energy spectrum of RaB + RaC went from 9 to 27 (later work by
Robinson Robinson may refer to:
People and names
* Robinson (name)
Fictional characters
* Robinson Crusoe, the main character, and title of a novel by Daniel Defoe, published in 1719
Geography
* Robinson projection, a map projection used since the 1960 ...
and Rutherford found 64; 16 from RaB and 48 from RaC). He finished his doctoral thesis in 1913, and by 1914 he was considered by
Rutherford as a leading researcher into
beta decay
In nuclear physics, beta decay (β-decay) is a type of radioactive decay in which a beta particle (fast energetic electron or positron) is emitted from an atomic nucleus, transforming the original nuclide to an isobar of that nuclide. For ...
, but he did no further work. He enlisted in the French army in 1914 and was killed in action near
Cormicy.
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) 241–320
Family
* He was the son of biologist
Jean Danysz (1860-1928).
[''Bulletin littéraire et scientifique'' (Association des anciens élèves de l'Ecole polonaise) - 1914/12/15 (Année 39, N°316)]
* He was the father of physicist
Marian Danysz (1909–1983).
References
1884 births
1914 deaths
20th-century French physicists
French Army soldiers
French military personnel killed in World War I
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