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Sigurd Hofmann
Sigurd Hofmann (born 15 February 1944 in Boehmisch-Kamnitz) is a German physicist.
== Biography ==
Hofmann discovered his love for physics at the Max Planck High School in Groß-Umstadt, Germany, where he graduated in 1963. He studied physics at the Technical University in Darmstadt (Diploma, 1969, and thesis at the Institute of Nuclear Physics with Egbert Kankeleit und Karl Wien, 1974). From 1974 to 1989 he was responsible for the detection and identification of nuclei produced in heavy ion reactions at the velocity separator SHIP (Separator for Heavy Ion reaction Products) at the GSI Helmholtz Centre for Heavy Ion Research. He was working in the Department Nuclear Chemistry II headed by Peter Armbruster. Since 1989 he is leading, after Gottfried Münzenberg, the experiments for the synthesis of new elements. Since 1998 he is Honorary Professor at the Goethe-Universität in Frankfurt am Main.
He was the leading scientist with the discovery experiments of the chemical elements darmstadtium (Ds, atomic number 110),〔S. Hofmann et al.: ''Production and decay of 269110.'' In: ''Zeitschrift für Physik A: Hadrons and Nuclei.'' volume 350, 1995, p. 277–280〕 roentgenium (Rg, 111)〔S. Hofmann et al.: ''The new element 111.'' In: ''Zeitschrift für Physik A: Hadrons and Nuclei.'' Volume 350, 1995, p. 281–282〕 and copernicium (Cn, 112).〔S. Hofmann et al.: ''The new element 112.'' In: ''Zeitschrift für Physik A: Hadrons and Nuclei.'' Volume 354, 1996, p. 229–-230〕 He made substantial contributions to the discovery experiments of the elements bohrium (Bh, 107),〔G. Münzenberg et al.: ''Identification of element 107 by α correlation chains.'' In: ''Zeitschrift für Physik A: Atoms and Nuclei.'' Volume 300, 1981, p. 107-108〕 hassium (Hs, 108)〔G. Münzenberg et al.: ''The identification of element 108.'' In: ''Zeitschrift für Physik A: Atoms and Nuclei.'' Volume 317, 1984, p. 235-236〕 and meitnerium (Mt, 109).〔G. Münzenberg et al.: ''Observation of one correlated α-decay in the reaction 58Fe on 209Bi → 267109.'' In: ''Zeitschrift für Physik A: Atoms and Nuclei.'' Volume 309, 1982, p. 89-90〕 He participated in the discovery of the element flerovium (Fl, 114)〔Yu.Ts. Oganessian et al.: ''Synthesis of nuclei of the superheavy element 114 in reactions induced by 48Ca.'' In: ''Nature'' Volume 400, 1999, p. 242-245〕 at the Flerov Laboratory of Nuclear Reactions (FLNR) in Dubna, Russia, and his research group confirmed data measured on the synthesis of the elements flerovium und livermorium (Lv, 116)〔S. Hofmann et al.: ''The reaction 48Ca + 248Cm → 296116
* studied at the GSI-SHIP'' In: ''The European Physical Journal A: Hadrons and Nuclei'' Volume 48, 2012, Article 62, p. 1-23〕 at FLNR. He identified many new isotopes located at the proton drip-line, among those the isotope 151Lu, the first case of radioactive emission of protons from the ground-state of a nucleus.〔S. Hofmann et al.: ''Proton radioactivity of 151Lu.'' In: ''Zeitschrift für Physik A: Atoms and Nuclei.'' Volume 305, 1982, p. 111-123〕 His speciality is nuclear spectroscopy and heavy ion reactions.
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