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KEK
, known as KEK, is a Japanese organization whose purpose is to operate the largest particle physics laboratory in Japan, situated in Tsukuba, Ibaraki prefecture. It was established in 1997. The term "KEK" is also used to refer to the laboratory itself, which employs approximately 695 employees. KEK's main function is to provide the particle accelerators and other infrastructure needed for high-energy physics, material science, structural biology, radiation science, computing science, nuclear transmutation and so on. Numerous experiments have been constructed at KEK by the internal and international collaborations that have made use of them. Makoto Kobayashi, emeritus professor at KEK, is known globally for his work on CP-violation, and was awarded the 2008 Nobel Prize in Physics. History KEK was established in 1997 in a reorganization of the Institute of Nuclear Study, the University of Tokyo (established in 1955), the National Laboratory for High Energy Physics (established ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Makoto Kobayashi (physicist)
is a Japanese physicist known for his work on CP-violation who was awarded one-fourth of the 2008 Nobel Prize in Physics "for the discovery of the origin of the broken symmetry which predicts the existence of at least three families of quarks in nature." Early life and education Makoto Kobayashi was born in Nagoya, Japan in 1944. When he was two years old, Kobayashi's father Hisashi died. The Kobayashi family home was destroyed by the Bombing of Nagoya, so they stayed at his mother's (surnamed Kaifu) family house. One of Makoto's cousins, Toshiki Kaifu, the 51st Prime Minister of Japan, was living in the same place. His other cousin was an astronomer, Norio Kaifu. Many years later, Toshiki Kaifu recalled Kobayashi: "when he was a child, he was a quiet and lovely boy, always reading some difficult books in my room. I think this is the beginning of his sudden change into a genius." After graduating from the School of Science of Nagoya University in 1967, he obtained ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tsukuba
is a city located in Ibaraki Prefecture, Japan. As of January 1, 2024, the city had an estimated population of 256,526 in 121,001 households and a population density of 900 persons per km2. The percentage of the population aged over 65 was 20.3%. The total area of the city is . It is known as the location of the , a planned science park developed in the 1960s. Geography Tsukuba is located in southern Ibaraki Prefecture, approximately 50 kilometers from central Tokyo and about 40 kilometers from Narita International Airport. Mount Tsukuba, from which the city takes its name, is located in the northern part of the city. Except for the area around Mount Tsukuba, the city is a part of the Kantō Plain with an altitude of 20 to 30 meters. Mountains: Mount Tsukuba, Mount Hokyo. Rivers: Kokai River, Sakura River, Higashiyata River, Nishiyata River, Ono River, Hanamuro River, Inari River. Parks: The city has more than 100 parks and green areas to relax in. Different parks a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-energy Physics
Particle physics or high-energy physics is the study of fundamental particles and forces that constitute matter and radiation. The field also studies combinations of elementary particles up to the scale of protons and neutrons, while the study of combinations of protons and neutrons is called nuclear physics. The fundamental particles in the universe are classified in the Standard Model as fermions (matter particles) and bosons (force-carrying particles). There are three generations of fermions, although ordinary matter is made only from the first fermion generation. The first generation consists of up and down quarks which form protons and neutrons, and electrons and electron neutrinos. The three fundamental interactions known to be mediated by bosons are electromagnetism, the weak interaction, and the strong interaction. Quarks cannot exist on their own but form hadrons. Hadrons that contain an odd number of quarks are called baryons and those that contain an even numbe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CP-violation
In particle physics, CP violation is a violation of CP-symmetry (or charge conjugation parity symmetry): the combination of C-symmetry (charge conjugation symmetry) and P-symmetry ( parity symmetry). CP-symmetry states that the laws of physics should be the same if a particle is interchanged with its antiparticle (C-symmetry) while its spatial coordinates are inverted ("mirror" or P-symmetry). CP violation is only observed in the weak interaction. The discovery of CP violation in 1964 in the decays of neutral kaons resulted in the Nobel Prize in Physics in 1980 for its discoverers James Cronin and Val Fitch. CP violation was subsequently discovered in many other meson decays. In 2025, the LHCb experiment discovered CP violation in baryons. There is some evidence CP violation may occur in neutrino interactions. It is important to the matter-antimatter asymmetry problem, the strong CP problem, and in the study of weak interactions in particle physics. Under the CPT theorem, e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electron
The electron (, or in nuclear reactions) is a subatomic particle with a negative one elementary charge, elementary electric charge. It is a fundamental particle that comprises the ordinary matter that makes up the universe, along with up quark, up and down quark, down quarks. Electrons are extremely lightweight particles that orbit the positively charged atomic nucleus, nucleus of atoms. Their negative charge is balanced by the positive charge of protons in the nucleus, giving atoms their overall electric charge#Charge neutrality, neutral charge. Ordinary matter is composed of atoms, each consisting of a positively charged nucleus surrounded by a number of orbiting electrons equal to the number of protons. The configuration and energy levels of these orbiting electrons determine the chemical properties of an atom. Electrons are bound to the nucleus to different degrees. The outermost or valence electron, valence electrons are the least tightly bound and are responsible for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Particle Physics
Particle physics or high-energy physics is the study of Elementary particle, fundamental particles and fundamental interaction, forces that constitute matter and radiation. The field also studies combinations of elementary particles up to the scale of protons and neutrons, while the study of combinations of protons and neutrons is called nuclear physics. The fundamental particles in the universe are classified in the Standard Model as fermions (matter particles) and bosons (force-carrying particles). There are three Generation (particle physics), generations of fermions, although ordinary matter is made only from the first fermion generation. The first generation consists of Up quark, up and down quarks which form protons and neutrons, and electrons and electron neutrinos. The three fundamental interactions known to be mediated by bosons are electromagnetism, the weak interaction, and the strong interaction. Quark, Quarks cannot exist on their own but form hadrons. Hadrons that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1984 In Science
The year 1984 in science and technology involved some significant events. Astronomy and space exploration * February 7 – Astronauts Bruce McCandless II and Robert L. Stewart make the first untethered space walk. * The National Radio Astronomy Observatory in the United States converts the 36-foot radio telescope on Kitt Peak (originally built in 1967 in science, 1967) to the ARO 12m Radio Telescope. Biology * First known case of Bovine spongiform encephalopathy, in England. * The enzyme telomerase is discovered by Carol W. Greider and Elizabeth Blackburn in the ciliate ''Tetrahymena''. * Danish physiologist Steen Willadsen first successfully uses cells from early embryos to clone a mammal (sheep) by nuclear transfer at the British Agricultural Research Council's Institute of Animal Physiology, Cambridge. Chemistry and physics * Peter Kramer (physicist), Peter Kramer and Dan Shechtman publish their discoveries of what will soon afterwards be named quasicrystals. * Hiroshi Kob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Particle Beam
A particle beam is a stream of charged particle, charged or neutral particles other than photons. In Particle accelerator, particle accelerators, these particles can move with a velocity close to the speed of light. There is a difference between the creation and control of charged particle beams and neutral particle beams, as only the first type can be manipulated to a sufficient extent by devices based on electromagnetism. The manipulation and diagnostics of charged particle beams at high kinetic energies using particle accelerators are main topics of accelerator physics. Sources Charged particles such as electrons, positrons, and protons may be separated from their common surroundings. This can be accomplished by processes such as thermionic emission or arc discharge. The following devices are commonly used as sources for particle beams: * Ion source * Cathode-ray tube, or more specifically in one of its parts called electron gun. This is also part of traditional television and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proton
A proton is a stable subatomic particle, symbol , Hydron (chemistry), H+, or 1H+ with a positive electric charge of +1 ''e'' (elementary charge). Its mass is slightly less than the mass of a neutron and approximately times the mass of an electron (the proton-to-electron mass ratio). Protons and neutrons, each with a mass of approximately one Dalton (unit), dalton, are jointly referred to as ''nucleons'' (particles present in atomic nuclei). One or more protons are present in the Atomic nucleus, nucleus of every atom. They provide the attractive electrostatic central force which binds the atomic electrons. The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number (represented by the symbol ''Z''). Since each chemical element, element is identified by the number of protons in its nucleus, each element has its own atomic number, which determines the number of atomic electrons and consequently the chemical characteristi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1982 In Science
The year 1982 in science and technology involved many significant events, listed below. Astronomy * January 17 – Allan Hills A81005, the first lunar meteorite found on Earth, is discovered in the Allan Hills at the end of the Transantarctic Mountains by John Schutt and Ian Whillans during the ANSMET meteorite gathering expedition. * March 10 – Syzygy: all 9 planets align on the same side of the Sun. * October 14 – Halley's Comet: First spotted in the sky after 70 year return. Biology * September – First report of anti-human monoclonal antibody production. Computer science * January 7 – The Commodore 64 8-bit home computer is launched by Commodore International (released in August); it becomes the all-time best-selling single personal computer model. * January 30 – First computer virus, the Elk Cloner, written by 15-year-old Rich Skrenta, is found in the wild. It infects Apple II computers via floppy disk. * July 9 – Sci-fi movie ''Tron'' is the first featur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photon
A photon () is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force. Photons are massless particles that can move no faster than the speed of light measured in vacuum. The photon belongs to the class of boson particles. As with other elementary particles, photons are best explained by quantum mechanics and exhibit wave–particle duality, their behavior featuring properties of both waves and particles. The modern photon concept originated during the first two decades of the 20th century with the work of Albert Einstein, who built upon the research of Max Planck. While Planck was trying to explain how matter and electromagnetic radiation could be in thermal equilibrium with one another, he proposed that the energy stored within a material object should be regarded as composed of an integer number of discrete, equal-sized parts. To explain the pho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Synchrotron
A synchrotron is a particular type of cyclic particle accelerator, descended from the cyclotron, in which the accelerating particle beam travels around a fixed closed-loop path. The strength of the magnetic field which bends the particle beam into its closed path increases with time during the accelerating process, being ''synchronized'' to the increasing kinetic energy of the particles. The synchrotron is one of the first accelerator concepts to enable the construction of large-scale facilities, since bending, beam focusing and acceleration can be separated into different components. The most powerful modern particle accelerators use versions of the synchrotron design. The largest synchrotron-type accelerator, also the largest particle accelerator in the world, is the Large Hadron Collider (LHC) near Geneva, Switzerland, completed in 2008 by the European Organization for Nuclear Research (CERN). It can accelerate beams of protons to an energy of 7 electron volt, teraelectro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
