A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or a combination of fission and fusion reactions, producing a nuclear explosion. Both bomb types release large quantities of energy from relatively small amounts of matter.
Building on major scientific breakthroughs made during the 1930s, the United Kingdom began the world's first nuclear weapons research project, codenamed Tube Alloys, in 1941, during World War II. The United States, in collaboration with the United Kingdom, initiated the Manhattan Project the following year to build a weapon using nuclear fission. The project also involved Canada. In August 1945, the atomic bombings of Hiroshima and Nagasaki were conducted by the United States, with British consent, against Japan at the close of that war, standing to date as the only use of nuclear weapons in hostilities.
The Physikalisch-Technische Bundesanstalt (PTB) is the national metrology institute of the Federal Republic of Germany, with scientific and technical service tasks. It is a higher federal authority and a public-law institution directly under federal government control, without legal capacity, under the auspices of the Federal Ministry for Economic Affairs and Climate Action.
DCF77 is a German longwave time signal and standard-frequency radio station. It started service as a standard-frequency station on 1 January 1959. In June 1973 date and time information was added. Its primary and backup transmitter are located at 50°0′56″N9°00′39″E in Mainflingen, about 25 km south-east of Frankfurt am Main, Germany. The transmitter generates a nominal power of 50 kW, of which about 30 to 35 kW can be radiated via a T-antenna.
The Norwegian heavy water sabotage was a series of Allied-led efforts to halt German heavy water production via hydroelectric plants in Nazi Germany-occupied Norway during World War II, involving both Norwegian commandos and Allied bombing raids. During the war, the Allies sought to inhibit the German development of nuclear weapons with the removal of heavy water and the destruction of heavy-water production plants. The Norwegian heavy water sabotage was aimed at the 60 MW Vemork power station at the Rjukan waterfall in Telemark.
The Soviet atomic bomb project was the classified research and development program that was authorized by Joseph Stalin in the Soviet Union to develop nuclear weapons during and after World War II.
The names Uranverein or Uranprojekt came to be applied in Nazi Germany to the undertakings of research in nuclear technology, including nuclear weapons and nuclear reactors, before and during World War II. The first effort started in April 1939, just months after the discovery of nuclear fission in Berlin in December 1938, but ended only few months later, shortly ahead of the September 1939 German invasion of Poland, for which many notable German physicists were drafted into the Wehrmacht. A second effort under the administrative purview of the Wehrmacht's Heereswaffenamt began on September 1, 1939, the day of the invasion of Poland. The program eventually expanded into three main efforts: Uranmaschine, production of uranium and heavy water, and uranium isotope separation. Eventually, the German military assessed that nuclear fission would not contribute significantly to the war, and in January 1942 the Heereswaffenamt turned the program over to the Reich Research Council while still continuing to fund the activity.
Jonastal, situated in the Ilm-Kreis district in Germany between Crawinkel and Arnstadt and near to the town of Ohrdruf, was a scene of military construction under the National Socialist regime during the last years of the Second World War. Thousands of prisoners from the Buchenwald concentration camp under the command of SS General Hans Kammler were forced to dig 25 tunnels into the surrounding mountain and the whole operation was performed under the strictest secrecy. The site was not completed and construction was abandoned before the end of the war.
Friedrich Wilhelm Strassmann was a German chemist who, with Otto Hahn in December 1938, identified the element barium as a product of the bombardment of uranium with neutrons. Their observation was the key piece of evidence necessary to identify the previously unknown phenomenon of nuclear fission, as was subsequently recognized and published by Lise Meitner and Otto Frisch. In their second publication on nuclear fission in February of 1939, Strassmann and Hahn predicted the existence and liberation of additional neutrons during the fission process, opening up the possibility of a nuclear chain reaction.
Robert Ochsenfeld was a German physicist. In 1933 he discovered together with Walther Meissner the Meisner-Ochsenfeld effect.
Rainer Karlsch is a German historian and author.
Kurt Diebner was a German nuclear physicist who is well known for directing and administering parts of the German nuclear weapons program, a secretive program aiming to build nuclear weapons for Nazi Germany during World War II. He was appointed the project's administrative director after Adolf Hitler authorized it.
Erich Schumann was a German physicist who specialized in acoustics and explosives, and had a penchant for music. He was a general officer in the army and a professor at the University of Berlin and the Technical University of Berlin. When Adolf Hitler came to power he joined the Nazi Party. During World War II, his positions in the Army Ordnance Office and the Army High Command made him one of the most powerful and influential physicists in Germany. He ran the German nuclear energy program from 1939 to 1942, when the army relinquished control to the Reich Research Council. His role in the project was obfuscated after the war by the German physics community's defense of its conduct during the war. The publication of his book on the military's role in the project was not allowed by the British occupation authorities. He was director of the Helmholtz Institute of Sound Psychology and Medical Acoustics.
Wilhelm Ohnesorge was a German politician in the Third Reich who sat in the Hitler Cabinet. From 1937 to 1945, he was the Reichsminister of the Reich Postal Ministry, the German postal service, having succeeded Paul Freiherr von Eltz-Rübenach. Along with his ministerial duties, Ohnesorge also significantly delved into research relating to propagation and promotion of the Nazi Party through the radio, and the development of a proposed German atomic bomb.
Gottfried Freiherr von Droste (1908–1992), a.k.a. Gottfried Freiherr von Droste zu Vischering-Padberg, was a German physical chemist. He worked at the Kaiser Wilhelm Institute for Chemistry (KWIC). He independently predicted that nuclear fission would release a large amount of energy. During World War II, he participated in the German nuclear energy project, also known as the Uranverein. In the latter years of the war, he worked at the Reich's University of Strassburg. After the war, he worked at the Physikalisch-Technische Bundesanstalt (Federal Physical and Technical Institute and also held a position at the Technical University of Braunschweig.
Luigi Romersa was an Italian journalist and writer who worked as a war correspondent during the Second World War. He probably was the only Italian to enter USA Army missile bases during the Cold War. He was a friend of Wernher von Braun. He was best known for his essays about World War II. He was married to Mary Kisselov.
Peter Finke is a German theoretical physicist who participated in Project-706, Pakistan's clandestine nuclear research project. A close associate and friend of the famous Pakistani nuclear engineer Munir Ahmad Khan (late), he is citizen of both Pakistan and Germany. He is one of the European scientists who participated in Project-706 in the 1970s.
Völkenrode is a quarter (Stadtteil) of Braunschweig, Lower Saxony, Germany. Formerly a municipality in its own right and part of the district of Braunschweig, it was incorporated into the city of Braunschweig in 1974. Today, it is part of the Stadtbezirk Lehndorf-Watenbüttel.
