Martin Schumacher (physicist)

Martin Schumacher

Martin Schumacher (born January 22, 1937 in Leopoldshöhe ) is a German physicist .

Scientific career

Martin Schumacher received his doctorate in 1965 under Arnold Flammersfeld in Göttingen with a topic in the field of nuclear physics . From 1966 to 1968 he worked as a fellow at the Bartol Research Institute in Philadelphia (USA) with Franz Metzger. It was here that he later developed his main field of work, the structural investigation of atomic and subatomic systems with two-photon reactions ( Compton scattering ). This reaction enables a non-destructive structural analysis, which is in contrast to usual particle reactions, in which the system to be examined is destroyed for the purpose of the investigation. With this method a new class of observations became possible, which essentially makes use of the simultaneous interaction of two photons with the electrically charged components of the atomic or subatomic system.

Further scientific work was carried out at the synchrocyclotron in Göttingen, at the research reactors in Karlsruhe, Jülich, Mol (Belgium) and Grenoble (France) and at the direct current electron accelerators at the universities of Mainz, Bonn and Lund (Sweden). In 1978 he was appointed university professor for physics at the Georg-August University in Göttingen .

Research results (selection)

• Measurement of the structure of inner electron shells of heavy atoms
• Scattering of photons in the Coulomb field of heavy nuclei (first evidence of Delbrück scattering 1975)
• Measurement of the electrical polarizability of the core
• Evidence of the pion exchange currents associated with the Yukawa interaction in the core
• Measurement of the electrical and magnetic polarizabilities of the free nucleon and the nucleon bound in the nucleus
• First direct evidence of the “ Higgs boson of the strong interaction” ( meson ) as part of the constituent quarks with Compton scattering on the proton (2010). ${\displaystyle \sigma }$

In addition, Martin Schumacher was involved in several working groups that carried out experiments on particle physics in the area of ​​less GeV .

New work gives an overview of the current state of research into the polarizabilities of the nucleon and a comparison of the dispersion theory of polarizabilities with the chiral effective field theory. The preliminary conclusion is a work on the origin of the mass of visible matter with an extension to the strange quark range.

Web links

Commons : Martin Schumacher  - Collection of images, videos and audio files

• Martin Schumacher at the University of Göttingen
• Martin Schumacher at inspirebeta.net (including publications)
• Martin Schumacher at Wikimedia [1]
• Publications: https://www.researchgate.net/profile/Martin_Schumacher4/contributions

Individual evidence

1. ↑ ^{a b} The present status of Delbrück scattering , AI Milstein, M. Schumacher, Physics Reports 241 (1994) 183
2. ↑ ^{a b} Compton scattering by nuclei M.-Th. Hütt, AI L'vov, AI Milstein, M. Schumacher, Physics Reports 323 (2000) 457
3. ↑ Perspectives on Photon Interactions with Hadrons and Nuclei Lecture Notes in Physics 365, M. Schumacher, G. Tamas Eds
4. ↑ Polarizability of the nucleon and Compton scattering , M. Schumacher, Prog. Part. Nucl. Phys. 55 (2005) 567, arxiv : hep-ph / 0501167
5. ↑ Observation of the Higgs boson of strong interaction via Compton scattering by the nucleon , M. Schumacher, Eur. Phys. J. C 67 (2010) 283, arxiv : 1001.0500 .
6. ↑ Structure of scalar mesons and the Higgs sector of strong interaction , Martin Schumacher, Journal of Physics G: Nucl. Part. Phys. 38 (2011) 083001; arxiv : 1106.1015 .
7. ↑ BONN-ELSA-GDH, BONN-ELSA-SAPHIR, MAINZ-A2, MAINZ-GDH
8. ^ "Dispersion theory of nucleon Compton scattering and polarizabilities", Martin Schumacher and Michael D. Scadron, Fortschr. Phys. 61, 703 (2013), arxiv : 1301.1567 .
9. ^ "Dispersion theory of nucleon polarizabilities and outlook on chiral effective field theory", Martin Schumacher, arxiv : 1307.2215 .
10. ^ "Nambu's Nobel Prize, the meson and the mass of visible matter", Martin Schumacher, Ann. Phys. (Berlin) 526, 215 (2014), arxiv : 1403.7804 . ${\displaystyle \sigma }$
11. ^ "Mass generation via the Higgs boson and the quark condensate of the QCD vacuum", Martin Schumacher, J. Phys. (2016) 87:44; arxiv : 1506.00410 . ${\displaystyle Pramana}$