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 is divided into 16 administrative provinces called voivodeships, covering an area of . Poland has a population of over 38 million and is the fifth-most populous ...

-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 citizen. He worked in the laboratory of

Marie 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 ...

in the commune of

Arcueil Arcueil () is a commune in the Val-de-Marne department in the southern suburbs of Paris, France. It is located from the center of Paris. Name The name Arcueil was recorded for the first time in 1119 as ''Arcoloï'', and later in the 12th c ...

, and led two CNRS laboratories at the ''

Centre national de la recherche scientifique The French National Centre for Scientific Research (french: link=no, Centre national de la recherche scientifique, CNRS) is the French state research organisation and is the largest fundamental science Basic research, also called pure research o ...

'' (CNRS).

Early life

Rosenblum was born in

Ciechanowiec Ciechanowiec (; yi, טשעכֿאַנאָװיץ, german: Rudelstadt) is a small town in Gmina Ciechanowiec, Wysokie Mazowieckie County, Podlaskie Voivodeship, eastern Poland. As of December 2021, the town has a population of 4,511. History In the ...

, 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 (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

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

University of Copenhagen The University of Copenhagen ( da, Københavns Universitet, KU) is a prestigious public university, public research university in Copenhagen, Copenhagen, Denmark. Founded in 1479, the University of Copenhagen is the second-oldest university in ...

and Hebrew, Armenian and Arabic at the

University of Lund , motto = Ad utrumque , mottoeng = Prepared for both , established = , type = Public research university , budget = SEK 9 billion Niels Bohr Niels Henrik David Bohr (; 7 October 1885 – 18 November 1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. B ...

's assistant in a café in

Copenhagen Copenhagen ( or .; da, København ) is the capital and most populous city of Denmark, with a proper population of around 815.000 in the last quarter of 2022; and some 1.370,000 in the urban area; and the wider Copenhagen metropolitan ar ...

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 the ...

. After studying in Copenhagen and

Berlin Berlin ( , ) is the capital and largest city of Germany by both area and population. Its 3.7 million inhabitants make it the European Union's most populous city, according to population within city limits. One of Germany's sixteen constitue ...

, 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 fields of radioactivity and radiochemistry. He is referred to as the father of nuclear chemistry and father of nuclear fission. Hahn and Lise Meitner ...

) focused on the propagation of radiation through matter.

Career

In 1929, he used the electromagnet of the ''

Académie des sciences The French Academy of Sciences (French: ''Académie des 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 research. It was at the ...

'', 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 rotator ...

, to study the a radiation of

thorium Thorium is a weakly radioactive metallic chemical element with the symbol Th and atomic number 90. Thorium is silvery and tarnishes black when it is exposed to air, forming thorium dioxide; it is moderately soft and malleable and has a high me ...

C (now known to be

bismuth Bismuth is a chemical element with the Symbol (chemistry), 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 ...

-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 with the symbol Ac and atomic number 89. It was first isolated by Friedrich Oskar Giesel in 1902, who gave it the name ''emanium''; the element got its name by being wrongly identified with a substance And ...

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

Munich Munich ( ; german: München ; bar, Minga ) is the capital and most populous city of the States of Germany, German state of Bavaria. With a population of 1,558,395 inhabitants as of 31 July 2020, it is the List of cities in Germany by popu ...

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

Nazism Nazism ( ; german: Nazismus), the common name in English for National Socialism (german: Nationalsozialismus, ), is the far-right totalitarian political ideology and practices associated with Adolf Hitler and the Nazi Party (NSDAP) in Na ...

. There he befriended

Albert Einstein Albert Einstein ( ; ; 14 March 1879 – 18 April 1955) was a German-born theoretical physicist, widely acknowledged to be one of the greatest and most influential physicists of all time. Einstein is best known for developing the theory ...

. He worked at the

École libre des hautes études The École Libre des Hautes Études ( ‘Free School for Advanced Studies’) was a "university-in-exile" for French academics in New York during the Second World War. It was chartered by the French (the Free French) and Belgian governments-in-e ...

, 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) is a graduate-level educational institution that is one of the divisions of The New School in New York City, United States. The university was founded in 1919 as a home for progressive era thinkers. NSSR ...

New York City New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...

. He also worked at

Princeton university Princeton University is a private university, private research university in Princeton, New Jersey. Founded in 1746 in Elizabeth, New Jersey, Elizabeth as the College of New Jersey, Princeton is the List of Colonial Colleges, fourth-oldest ins ...

. 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 19th-century Polish Jews People from Ciechanowiec Polish emigrants to France Jewish emigrants from Nazi Germany to the United States