what can you tell me about the former member of the research team?
He is a German physicist at the Gesellschaft für Schwerionenforschung (GSI) facility in Darmstadt, Germany
Peter Armbruster
Peter Armbruster (born 25 July 1931) is a German physicist at the Gesellschaft für Schwerionenforschung (GSI) facility in Darmstadt, Germany, 
what is meitnerium? An extremely radioactive synthetic chemical element what is its symbol? Mt what is its atomic number? 109 which block does it belong to in the periodic table? d-block when was it discovered? August 29, 1982 who discovered it? A German research team led by Peter Armbruster and Gottfried Münzenberg does it have any isotops? It has no stable or naturally occurring isotopes but several radioactive isotopes have been synthesized in the laboratory
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Peter Armbruster [SEP] Introduction
Peter Armbruster (born 25 July 1931) is a German physicist at the Gesellschaft für Schwerionenforschung (GSI) facility in Darmstadt, Germany, and is credited with co-discovering elements 107 (bohrium), 108 (hassium), 109 (meitnerium), 110 (darmstadtium), 111 (roentgenium), and 112 (copernicium) with research partner Gottfried Münzenberg. Armbruster was born in Dachau, Bavaria. He studied physics at the Technical University of Stuttgart and Munich, and obtained his Ph.D. in 1961 under Heinz Maier-Leibnitz, Technical University of Munich. His major research fields are fission, interaction of heavy ions in matter and atomic physics with fission product beams at the Research Centre of Jülich (1965 to 1970).