Salomon Aminyu Zalman Rosenblum (2 June 1896 – 22 November 1959) was a

Poland Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, bordered by Lithuania and Russia to the northeast, Belarus and Ukrai ...

-born

nuclear physicist Nuclear physics is the field of physics that studies atomic nuclei and their constituents and interactions, in addition to the study of other forms of nuclear matter. Nuclear physics should not be confused with atomic physics, which studies the ...

. He became a French national in 1929. He worked in the laboratory of

Marie Curie Maria Salomea Skłodowska-Curie (; ; 7 November 1867 – 4 July 1934), known simply as Marie Curie ( ; ), was a Polish and naturalised-French physicist and chemist who conducted pioneering research on radioactivity. She was List of female ...

in the commune of

Arcueil Arcueil () is a Communes of France, commune in the Val-de-Marne Departments of France, department in the southern suburbs of Paris, France. It is located from the Kilometre Zero#France, center of Paris. Name The name Arcueil was recorded f ...

, and led two CNRS laboratories at the ''

Centre national de la recherche scientifique The French National Centre for Scientific Research (, , CNRS) is the French state research organisation and is the largest fundamental science agency in Europe. In 2016, it employed 31,637 staff, including 11,137 tenured researchers, 13,415 eng ...

'' (CNRS).

Early life

Rosenblum was born in

Ciechanowiec Ciechanowiec (; )JewishGen Locality Page - Ciechanowiec, Poland
, f ...

, in Russian-controlled Poland to Ita Miriam Rosenblum (née Horovitz) and Jehoshua Mordechai Rosenblum, a reasonably wealthy Jewish family. His studies were interrupted by

World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...

. He emigrated to Denmark and Sweden, studying philosophy at the

University of Copenhagen The University of Copenhagen (, KU) is a public university, public research university in Copenhagen, Copenhagen, Denmark. Founded in 1479, the University of Copenhagen is the second-oldest university in Scandinavia, after Uppsala University. ...

and Hebrew, Armenian and Arabic at the

University of Lund Lund University () is a public research university in Sweden and one of Northern Europe's oldest universities. The university is located in the city of Lund in the Swedish province of Scania. The university was officially founded in 1666 on the ...

. A chance encounter and discussion with

Niels Bohr Niels Henrik David Bohr (, ; ; 7 October 1885 – 18 November 1962) was a Danish theoretical physicist who made foundational contributions to understanding atomic structure and old quantum theory, quantum theory, for which he received the No ...

's assistant in a café in

Copenhagen Copenhagen ( ) is the capital and most populous city of Denmark, with a population of 1.4 million in the Urban area of Copenhagen, urban area. The city is situated on the islands of Zealand and Amager, separated from Malmö, Sweden, by the ...

led him to abandon his thesis on ancient languages and to commence studies in

nuclear physics Nuclear physics is the field of physics that studies atomic nuclei and their constituents and interactions, in addition to the study of other forms of nuclear matter. Nuclear physics should not be confused with atomic physics, which studies th ...

. After studying in Copenhagen and

Berlin Berlin ( ; ) is the Capital of Germany, capital and largest city of Germany, by both area and List of cities in Germany by population, population. With 3.7 million inhabitants, it has the List of cities in the European Union by population withi ...

, he joined Curie's ''Institut du Radium'' in Paris in 1923, following Bohr's recommendation. His doctoral thesis in 1928 (he was a doctoral student of

Otto Hahn Otto Hahn (; 8 March 1879 – 28 July 1968) was a German chemist who was a pioneer in the field of radiochemistry. He is referred to as the father of nuclear chemistry and discoverer of nuclear fission, the science behind nuclear reactors and ...

) focused on the propagation of radiation through matter. He acquired

French nationality French nationality law is historically based on the principles of ''jus soli'' (Latin for "right of soil") and ''jus sanguinis'', (Latin for "right of blood") according to Ernest Renan's definition, in opposition to the German definition of nat ...

by naturalization on 26 November 1929.

Career

In 1929, he used the electromagnet of the ''

Académie des sciences The French Academy of Sciences (, ) is a learned society, founded in 1666 by Louis XIV at the suggestion of Jean-Baptiste Colbert, to encourage and protect the spirit of French Scientific method, scientific research. It was at the forefron ...

'', under the direction of

Aimé Cotton Aimé Auguste Cotton (9 October 1869 – 16 April 1951) was a French physicist known for his studies of the interaction of light with chiral molecules. In the absorption bands of these molecules, he discovered large values of optical rotato ...

, to study the a radiation of

thorium Thorium is a chemical element; it has symbol Th and atomic number 90. Thorium is a weakly radioactive light silver metal which tarnishes olive grey when it is exposed to air, forming thorium dioxide; it is moderately soft, malleable, and ha ...

C (now known to be

bismuth Bismuth is a chemical element; it has symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens, with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental bismuth occurs nat ...

-212). During his research he discovered that the unique alpha-ray line of thorium C was actually composed of six fine lines, thus showing that the alpha particles had different energies. He continued his research with the electromagnet, at the time the most powerful in the world, studying the radiation of other radioactive elements (such as

actinium Actinium is a chemical element; it has chemical symbol, symbol Ac and atomic number 89. It was discovered by Friedrich Oskar Giesel in 1902, who gave it the name ''emanium''; the element got its name by being wrongly identified with a substa ...

in 1929, using a specimen prepared by Curie herself). Rosenblum married Eva Elisabeth Stadler - a

Munich Munich is the capital and most populous city of Bavaria, Germany. As of 30 November 2024, its population was 1,604,384, making it the third-largest city in Germany after Berlin and Hamburg. Munich is the largest city in Germany that is no ...

-born psychoanalyst - in 1938. He fled from France to the US in 1941 to escape

Nazism Nazism (), formally named National Socialism (NS; , ), is the far-right totalitarian socio-political ideology and practices associated with Adolf Hitler and the Nazi Party (NSDAP) in Germany. During Hitler's rise to power, it was fre ...

. There he befriended

Albert Einstein Albert Einstein (14 March 187918 April 1955) was a German-born theoretical physicist who is best known for developing the theory of relativity. Einstein also made important contributions to quantum mechanics. His mass–energy equivalence f ...

. He worked at the

École libre des hautes études The ( 'Free School for Advanced Studies') was a "university-in-exile" for French academics in New York City, New York during the Second World War. It was chartered by the French (the Free French) and Belgian governments-in-exile and located at the ...

, a 'university-in-exile' chartered by the French and Belgian governments-in-exile for their refugee academics. It was located at

The New School for Social Research The New School for Social Research (NSSR), previously known as The University in Exile and The New School University, is a graduate-level educational division of The New School in New York City, United States. NSSR enrolls more than 1,000 stud ...

New York City New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ...

. He also worked at

Princeton university Princeton University is a private university, private Ivy League research university in Princeton, New Jersey, United States. Founded in 1746 in Elizabeth, New Jersey, Elizabeth as the College of New Jersey, Princeton is the List of Colonial ...

. After the Liberation, he returned to France in 1944 and became a director of a CNRS laboratory in Bellevue, and then in Orsay. He died at Meudon Bellevue.

References

{{DEFAULTSORT:Rosenblum, Salomon 1896 births 1959 deaths 20th-century French physicists 20th-century Polish scientists 20th-century Polish Jews People from Ciechanowiec Polish emigrants to France Naturalized citizens of France Jewish emigrants from Nazi Germany to the United States