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Modane Underground Laboratory
The Modane Underground Laboratory (LSM) (; also known as the Fréjus Underground Laboratory) is a subterranean particle physics laboratory located within the Fréjus Road Tunnel near Modane, France. It is jointly operated by the French Centre national de la recherche scientifique, National Center for Scientific Research and the Commissariat à l'énergie atomique et aux énergies alternatives, Atomic Energy and Alternative Energies Commission in partnership with the University of Savoie. The laboratory sits almost exactly in the middle of the road tunnel, which links Modane to Bardonecchia, Italy, below Fréjus Peak. This depth translates to a meter water equivalent depth of . , it is the deepest laboratory in the European Union. The LSM was built between 1981 and 1982 to host the "Fréjus" iron tracking calorimeter proton decay experiment. Today the site houses the Neutrino Ettore Majorana Observatory (NEMO) search for neutrinoless double beta decay, the EDELWEISS dark matter ... [...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] |
European Union
The European Union (EU) is a supranational union, supranational political union, political and economic union of Member state of the European Union, member states that are Geography of the European Union, located primarily in Europe. The union has a total area of and an estimated population of over 449million as of 2024. The EU is often described as a ''sui generis'' political entity combining characteristics of both a federation and a confederation. Containing 5.5% of the world population in 2023, EU member states generated a nominal gross domestic product (GDP) of around €17.935 trillion in 2024, accounting for approximately one sixth of global economic output. Its cornerstone, the European Union Customs Union, Customs Union, paved the way to establishing European Single Market, an internal single market based on standardised European Union law, legal framework and legislation that applies in all member states in those matters, and only those matters, where the states ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Underground Laboratories
Underground most commonly refers to: * Subterranea (geography), the regions beneath the surface of the Earth Underground may also refer to: Places * Buenos Aires Underground, a rapid transit system * London Underground, a rapid transit system * The Underground (Boston), a music club in the Allston neighborhood of Boston * The Underground (Stoke concert venue), a club/music venue based in Hanley, Stoke-on-Trent * Underground (Manhattan), a music club (1980—1989) in Manhattan * Underground Atlanta, a shopping and entertainment district in the Five Points neighborhood of downtown Atlanta, Georgia * Underground City, Montreal * Underground city, a series of linked subterranean spaces * Underground living, modes of living below the ground's surface Arts, entertainment, and media Films * ''Underground'' (1928 film), a drama by Anthony Asquith * ''Underground'' (1941 film), a war drama by Vincent Sherman * ''Underground'' (1970 film), a war drama starring Robert Goulet * ''Unde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science And Technology In Europe
Europe's achievements in science and technology have been significant and research and development efforts form an integral part of the European economy. Europe has been the home of some of the most prominent researchers in various scientific disciplines, notably physics, mathematics, chemistry and engineering. Scientific research in Europe is supported by industry, by the European universities and by several scientific institutions. All the raw output of scientific research from Europe consistently ranks among the world's best. Historical overview Mathematics flourished in the Greek world from 600 BC to 300 AD. However, the study of mathematics was de-emphasized when the Roman Empire was in power, and became even less important after the fall of Rome. Medieval Europeans were interested in mathematics for different reasons than modern mathematicians are; namely, they studied mathematics because they thought it was the basis to understand the created order of nature, as explain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Particle Physics Facilities
In the Outline of physical science, physical sciences, a particle (or corpuscle in older texts) is a small wikt:local, localized physical body, object which can be described by several physical property, physical or chemical property, chemical properties, such as volume, density, or mass. They vary greatly in size or quantity, from subatomic particles like the electron, to microscopic scale, microscopic particles like atoms and molecules, to macroscopic scale, macroscopic particles like powder (substance), powders and other granular materials. Particles can also be used to create scientific models of even larger objects depending on their density, such as humans moving in a crowd or celestial bodies in motion (physics), motion. The term ''particle'' is rather general in meaning, and is refined as needed by various scientific fields. Anything that is composed of particles may be referred to as being particulate. However, the noun ''particulates, particulate'' is most frequently u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Particle Detector
In experimental and applied particle physics, nuclear physics, and nuclear engineering, a particle detector, also known as a radiation detector, is a device used to detect, track, and/or identify ionizing elementary particle, particles, such as those produced by nuclear decay, cosmic radiation, or reactions in a particle accelerator. Detectors can measure the particle energy and other attributes such as momentum, spin, charge, particle type, in addition to merely registering the presence of the particle. The operating of a nuclear radiation detector The operating principle of a nuclear radiation detector can be summarized as follows: The detector identifies high-energy particles or photons—such as alpha, beta, gamma radiation, or neutrons—through their interactions with the atoms of the detector material. These interactions generate a primary signal, which may involve ionization of gas, the creation of electron-hole pairs in semiconductors, or the emission of light in scint ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dark Matter
In astronomy, dark matter is an invisible and hypothetical form of matter that does not interact with light or other electromagnetic radiation. Dark matter is implied by gravity, gravitational effects that cannot be explained by general relativity unless more matter is present than can be observed. Such effects occur in the context of Galaxy formation and evolution, formation and evolution of galaxies, gravitational lensing, the observable universe's current structure, mass position in galactic collisions, the motion of galaxies within galaxy clusters, and cosmic microwave background Anisotropy, anisotropies. Dark matter is thought to serve as gravitational scaffolding for cosmic structures. After the Big Bang, dark matter clumped into blobs along narrow filaments with superclusters of galaxies forming a cosmic web at scales on which entire galaxies appear like tiny particles. In the standard Lambda-CDM model of cosmology, the mass–energy equivalence, mass–energy content o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EDELWEISS
''Leontopodium nivale'', commonly called edelweiss () ( ; or ), is a mountain flower belonging to the daisy or sunflower family Asteraceae. The plant prefers rocky limestone places at about altitude. It is a non-toxic plant. Its leaves and flowers are covered with dense hairs, which appear to protect the plant from cold, aridity, and ultraviolet radiation. It is a scarce, short-lived flower found in remote mountain areas and has been used as a symbol for alpinism, for rugged beauty and purity associated with the Alps and Carpathians. It is a national symbol of several countries, specifically Bulgaria, Austria, Slovenia, Switzerland, and Italy. In Romania it was declared a "monument of nature" in 1931. The Edelweiss day is celebrated on 5 March. According to folk tradition, giving this flower to a loved one is a promise of dedication. Names The flower's common name is German language, German (and or in Alemannic German), and is a compound of "noble" and "white". The Slove ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neutrinoless Double Beta Decay
Neutrinoless double beta decay (0νββ) is a commonly proposed and experimentally pursued theoretical radioactive decay process that would prove a Majorana particle, Majorana nature of the neutrino particle. To this day, it has not been found. The discovery of neutrinoless double beta decay could shed light on the absolute neutrino masses and on their mass hierarchy (Neutrino mass). It would mean the first ever signal of the violation of total lepton number conservation. A Majorana nature of neutrinos would confirm that the neutrino is its own antiparticle. To search for neutrinoless double beta decay, there are currently a number of experiments underway, with several future experiments for increased sensitivity proposed as well. History The Italian physicist Ettore Majorana first introduced the concept of a particle being its own antiparticle in 1937. Particles of this nature were subsequently named after him as Majorana particles. In 1939, Wendell H. Furry proposed the i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neutrino Ettore Majorana Observatory
The Neutrino Ettore Majorana Observatory (NEMO experiment) is an international collaboration of scientists searching for neutrinoless double beta decay (0νββ). The collaboration has been active since 1989. Observation of 0νββ would indicate neutrinos are Majorana particles and could be used to measure the neutrino mass. It is located in the Modane Underground Laboratory (LSM) in the Fréjus Road Tunnel. The experiment has (as of 2018) had 3 detectors, NEMO-1, NEMO-2, NEMO-3 (and a demonstrator module of SuperNEMO-detector) and is planning (as of 2018) to construct a new detector SuperNEMO. The NEMO-1 and NEMO-2 prototype detectors were used until 1997. Latest experiment NEMO-3 was under design and construction from 1994 onwards, took data from January 2003 to January 2011 and the final data analysis was published in 2018. The NEMO-2 and NEMO-3 detectors produced measurements for double neutrino decays and limits for neutrinoless double-beta decay for a number of elements ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proton Decay
In particle physics, proton decay is a hypothetical form of particle decay in which the proton decays into lighter subatomic particles, such as a neutral pion and a positron. The proton decay hypothesis was first formulated by Andrei Sakharov in 1967. Despite significant experimental effort, proton decay has never been observed. If it does decay via a positron, the proton's half-life is constrained to be at least . According to the Standard Model, the proton, a type of baryon, is stable because baryon number ( quark number) is conserved (under normal circumstances; see ''Chiral anomaly'' for an exception). Therefore, protons will not decay into other particles on their own, because they are the lightest (and therefore least energetic) baryon. Positron emission and electron capture—forms of radioactive decay in which a proton becomes a neutron—are not proton decay, since the proton interacts with other particles within the atom. Some beyond-the-Standard-Model grand unifi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Durham, England
Durham ( , locally ) is a cathedral city and civil parish in the county of County Durham, Durham, England. It is the county town and contains the headquarters of Durham County Council, the unitary authority which governs the district of County Durham (district), County Durham. The built-up area had a population of 50,510 at the 2021 Census. The city was built on a meander of the River Wear, which surrounds the centre on three sides and creates a narrow neck on the fourth. The surrounding land is hilly, except along the Wear's floodplain to the north and southeast. Durham was founded in 995 by Anglo-Saxon monks seeking a place safe from Viking Age, Viking raids to house the relics of St Cuthbert. The church the monks built lasted only a century, as it was replaced by the present Durham Cathedral after the Norman Conquest; together with Durham Castle it is a UNESCO World Heritage Site. From the 1070s until 1836 the city was part of the County Palatine of Durham, a semi-independ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
