Janusz Andrzej Zakrzewski (23 July 1932 in

Kraków Kraków (), or Cracow, is the second-largest and one of the oldest cities in Poland. Situated on the Vistula River in Lesser Poland Voivodeship, the city dates back to the seventh century. Kraków was the official capital of Poland until 159 ...

– 26 October 2008 in

Warsaw Warsaw ( pl, Warszawa, ), officially the Capital City of Warsaw,, abbreviation: ''m.st. Warszawa'' is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland, and its population is official ...

) was a Polish

physicist A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate ca ...

. He was a professor of the

University of Warsaw The University of Warsaw ( pl, Uniwersytet Warszawski, la, Universitas Varsoviensis) is a public university in Warsaw, Poland. Established in 1816, it is the largest institution of higher learning in the country offering 37 different fields of ...

(since 1971), member of the

Warsaw Scientific Society Warsaw Scientific Society (Polish: ''Towarzystwo Naukowe Warszawskie''; TNW) is a Polish scientific society based in Warsaw Warsaw ( pl, Warszawa, ), officially the Capital City of Warsaw,, abbreviation: ''m.st. Warszawa'' is the capital ...

(since 1984),

Polish Academy of Sciences The Polish Academy of Sciences ( pl, Polska Akademia Nauk, PAN) is a Polish state-sponsored institution of higher learning. Headquartered in Warsaw, it is responsible for spearheading the development of science across the country by a society of ...

(1986),

Polish Academy of Learning The Polish Academy of Arts and Sciences or Polish Academy of Learning ( pl, Polska Akademia Umiejętności), headquartered in Kraków and founded in 1872, is one of two institutions in contemporary Poland having the nature of an academy of scien ...

. He served as president of the

Polish Physical Society The Polish Physical Society ( pl, Polskie Towarzystwo Fizyczne, PTF) is a professional scientific society of Polish physicists. History The Polish Physical Society was established during an organizational meeting on 11 April 1920 in Warsaw. Wła ...

between 1987–1991. Zakrzewski was a researcher and author of works about

high-energy nuclear physics High-energy nuclear physics studies the behavior of nuclear matter in energy regimes typical of high-energy physics. The primary focus of this field is the study of heavy-ion collisions, as compared to lighter atoms in other particle accelerat ...

and

elementary particle In particle physics, an elementary particle or fundamental particle is a subatomic particle that is not composed of other particles. Particles currently thought to be elementary include electrons, the fundamental fermions (quarks, leptons, antiq ...

s. He participated in discovery of heavy

atomic nucleus The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden experiments, Geiger–Marsden gold foil experiment. After th ...

(1961) and double

hypernucleus A hypernucleus is similar to a conventional atomic nucleus, but contains at least one hyperon in addition to the normal protons and neutrons. Hyperons are a category of baryon particles that carry non-zero strangeness quantum number, which is con ...

(1963). He was a co-author (with Andrzej Kajetan Wróblewski) of handbook ''Wstęp do fizyki'' ("Introduction to physics").

Notable works

* * *

References

* * 1932 births Scientists from Kraków Polish nuclear physicists 20th-century Polish physicists 2008 deaths {{Poland-scientist-stub