Jan Kazimierz Danysz, Date of Birth, Place of Birth, Date of Death

Jan Kazimierz Danysz

Polish physicist

Date of Birth: 11-Mar-1884

Place of Birth: Paris, Île-de-France, France

Date of Death: 04-Nov-1914

Profession: physicist

Nationality: Poland

Zodiac Sign: Pisces

Jean Danysz (11 March 1884 – 4 November 1914) born Jan Kazimierz Danysz, was a French physicist of Polish extraction.
He was an assistant of Maria Sklodowska-Curie and notable in the development of beta spectrometry. Danysz made considerable advances on the magnetic deflection 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 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, but he did no further work.
He enlisted in the French army in 1914 and was killed in action near Cormicy.