Ruprecht Machleidt (December 18, 1943 – December 14, 2023) was a German-American theoretical nuclear physicist.

Education and CV

Ruprecht Machleidt was born on December 18, 1943 in

Kiel Kiel () is the capital and most populous city in the northern Germany, German state of Schleswig-Holstein, with a population of 246,243 (2021). Kiel lies approximately north of Hamburg. Due to its geographic location in the southeast of the J ...

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

and studied physics at the

University of Bonn The Rhenish Friedrich Wilhelm University of Bonn (german: Rheinische Friedrich-Wilhelms-Universität Bonn) is a public research university located in Bonn, North Rhine-Westphalia, Germany. It was founded in its present form as the ( en, Rhine U ...

Bonn The federal city of Bonn ( lat, Bonna) is a city on the banks of the Rhine in the German state of North Rhine-Westphalia, with a population of over 300,000. About south-southeast of Cologne, Bonn is in the southernmost part of the Rhine-Ruhr r ...

, Germany, where he received his master's degree (Diplom-Physiker) in 1971 and his doctorate in 1973. As a postdoc, he continued at the Institute for Theoretical Nuclear Physics at the University of Bonn until 1975. The years 1976 and 1977 he spent at the

State University of New York The State University of New York (SUNY, , ) is a system of public colleges and universities in the State of New York. It is one of the largest comprehensive system of universities, colleges, and community colleges in the United States. Led by c ...

at Stony Brook (SUNY) with the group of Gerry Brown. From 1978 to 1983 he was a research associate (Wissenschaftlicher Assistant) in Bonn. 1983 to 1985 he was a visiting scientist at TRIUMF,

University of British Columbia The University of British Columbia (UBC) is a public university, public research university with campuses near Vancouver and in Kelowna, British Columbia. Established in 1908, it is British Columbia's oldest university. The university ranks a ...

, in

Vancouver Vancouver ( ) is a major city in western Canada, located in the Lower Mainland region of British Columbia. As the List of cities in British Columbia, most populous city in the province, the 2021 Canadian census recorded 662,248 people in the ...

, Canada, and from 1986 to 1988 at the

Los Alamos National Laboratory Los Alamos National Laboratory (often shortened as Los Alamos and LANL) is one of the sixteen research and development laboratories of the United States Department of Energy (DOE), located a short distance northwest of Santa Fe, New Mexico, ...

(at LAMPF), Los Alamos, New Mexico, USA. At the same time, he was an Adjunct Associate Professor at

UCLA The University of California, Los Angeles (UCLA) is a public land-grant research university in Los Angeles, California. UCLA's academic roots were established in 1881 as a teachers college then known as the southern branch of the California St ...

, Los Angeles. In 1988, he accepted the position of associate professor and in 1991 full professor at the

University of Idaho The University of Idaho (U of I, or UIdaho) is a public land-grant research university in Moscow, Idaho. It is the state's land-grant and primary research university,, and the lead university in the Idaho Space Grant Consortium. The University ...

, Moscow, Idaho, USA. Ruprecht Machleidt died on December 14, 2023 in Moscow (Idaho).

Work

He is known as one of the developers of the Bonn potential to describe the

nucleon In physics and chemistry, a nucleon is either a proton or a neutron, considered in its role as a component of an atomic nucleus. The number of nucleons in a nucleus defines the atom's mass number (nucleon number). Until the 1960s, nucleons were ...

–nucleon interaction based upon a comprehensive

meson In particle physics, a meson ( or ) is a type of hadronic subatomic particle composed of an equal number of quarks and antiquarks, usually one of each, bound together by the strong interaction. Because mesons are composed of quark subparticles ...

exchange model. Next he dealt with nuclear matter, taking into account meson degrees of freedom and relativistic effects (Dirac–Brueckner–Hartree–Fock). Since about 2000, Machleidt's main focus has been the development of nuclear forces based upon

chiral Chirality is a property of asymmetry important in several branches of science. The word ''chirality'' is derived from the Greek (''kheir''), "hand", a familiar chiral object. An object or a system is ''chiral'' if it is distinguishable from ...

effective field theory.

Selected works

* "

Nuclear Forces The nuclear force (or nucleon–nucleon interaction, residual strong force, or, historically, strong nuclear force) is a force that acts between the protons and neutrons of atoms. Neutrons and protons, both nucleons, are affected by the nucl ...

", ''Scholarpedia'', Volume 9(1), 2014, p. 30710 (http://www.scholarpedia.org/article/Nuclear_Forces) * "Chiral effective field theory and nuclear forces", ''Physics Reports'', Volume 503, 2011, pp. 1–75, with D.R. Entem * "Accurate charge-dependent nucleon-nucleon potential at fourth order of chiral perturbation theory", ''Phys. Rev. C'', Volume 68, 2003, p. 041001, with D. R. Entem * "Shell model description of the C-14 dating beta decay with Brown-Rho-scaled NN interactions", ''Phys. Rev. Lett.'', Volume 100, 2008, pp. 062501, with J.W. Holt, Gerald Brown, Thomas Kuo, J.D. Holt * "The nucleon - nucleon interaction", Topical Review, ''J. Phys. G: Nucl. Part Phys.'', Volume 27, 2001, pp. R69 - R108, with I. Slaus * "High-precision, charge-dependent, Bonn nucleon-nucleon Potential", ''Phys. Rev. C'', Volume 63, 2001, p. 024001 * "Relativistic nuclear structure I: Nuclear matter", ''Phys. Rev. C'', Volume 42, 1990, p. 1965, with R. Brockmann * "Nuclear saturation in a relativistic Brueckner-Hartree–Fock approach", ''Phys. Lett.'', Volume 149B, 1984, p. 283, with R. Brockmann * "The meson theory of nuclear forces and nuclear structure, Advances in ''Nucl . Phys.'', Volume 19, 1989, pp. 189-376 * "The Bonn meson-exchange model for the nucleon - nucleon interaction", ''Physics Reports'', Volume 149, 1987, pp. 1–89, with K. Holinde and Ch. Elster * "Momentum-space OBEP, two-nucleon and nuclear matter data", ''Nucl. Phys.'', Volume A247, 1975, p. 495, with K. Holinde * "Neutron matter with a relativistic one-boson-exchange potential", ''Nucl. Phys.'', Volume A205, 1973, p. 292, with K. Bleuler, K. Erkelenz, and K. Holinde

External links

Home page in Idaho (http://machleidt.weebly.com)

References

{{DEFAULTSORT:Machleidt, Ruprecht German nuclear physicists American nuclear physicists 1943 births 2023 deaths Fellows of the American Physical Society