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The Relativistic Heavy Ion Collider is the first and one of only two operating heavy-ion colliders, and the only spin-polarized proton collider ever built. Located at Brookhaven National Laboratory (BNL) in Upton, New York, and used by an international team of researchers, it is the only operating particle collider in the US. By using RHIC to collide ions traveling at relativistic speeds, physicists study the primordial form of matter that existed in the universe shortly after the Big Bang. By colliding spin-polarized protons, the spin structure of the proton is explored.
High-energy nuclear physics studies the behavior of nuclear matter in energy regimes typical of high-energy physics. The primary focus of this field is the study of heavy-ion collisions, as compared to lighter atoms in other particle accelerators. At sufficient collision energies, these types of collisions are theorized to produce the quark–gluon plasma. In peripheral nuclear collisions at high energies one expects to obtain information on the electromagnetic production of leptons and mesons that are not accessible in electron–positron colliders due to their much smaller luminosities.
ALICE is one of nine detector experiments at the Large Hadron Collider at CERN. The project aims to study conditions like those which would have existed immediately after the Big Bang by measuring properties of quark-gluon plasma.
Quark–gluon plasma is an interacting localized assembly of quarks and gluons at thermal and chemical (abundance) equilibrium. The word plasma signals that free color charges are allowed. In a 1987 summary, Léon Van Hove pointed out the equivalence of the three terms: quark gluon plasma, quark matter and a new state of matter. Since the temperature is above the Hagedorn temperature—and thus above the scale of light u,d-quark mass—the pressure exhibits the relativistic Stefan-Boltzmann format governed by temperature to the fourth power and many practically massless quark and gluon constituents. It can be said that QGP emerges to be the new phase of strongly interacting matter which manifests its physical properties in terms of nearly free dynamics of practically massless gluons and quarks. Both quarks and gluons must be present in conditions near chemical (yield) equilibrium with their colour charge open for a new state of matter to be referred to as QGP.
Carlos A. Bertulani is a Brazilian and American theoretical physicist and professor at the department of physics of the Texas A&M University-Commerce. He graduated, PhD, at University of Bonn and works on nuclear physics and nuclear astrophysics. He was formerly a professor at the Federal University of Rio de Janeiro from 1980-2000.
Hot spots in subatomic physics are regions of high energy density or temperature in hadronic or nuclear matter.
In high-energy nuclear physics, strangeness production in relativistic heavy-ion collisions is a signature and diagnostic tool of quark–gluon plasma (QGP) formation and properties. Unlike up and down quarks, from which everyday matter is made, heavier quark flavors such as strange and charm typically approach chemical equilibrium in a dynamic evolution process. QGP is an interacting localized assembly of quarks and gluons at thermal (kinetic) and not necessarily chemical (abundance) equilibrium. The word plasma signals that color charged particles are able to move in the volume occupied by the plasma. The abundance of strange quarks is formed in pair-production processes in collisions between constituents of the plasma, creating the chemical abundance equilibrium. The dominant mechanism of production involves gluons only present when matter has become a quark–gluon plasma. When quark–gluon plasma disassembles into hadrons in a breakup process, the high availability of strange antiquarks helps to produce antimatter containing multiple strange quarks, which is otherwise rarely made. Similar considerations are at present made for the heavier charm flavor, which is made at the beginning of the collision process in the first interactions and is only abundant in the high-energy environments of CERN's Large Hadron Collider.
The NA49 experiment was a particle physics experiment that investigated the properties of quark–gluon plasma. The experiment's synonym was Ions/TPC-Hadrons. It took place in the North Area of the Super Proton Synchrotron (SPS) at CERN from 1991-2002.
Erwin Max Friedlander was a noted American expert in high-energy nuclear physics at Lawrence Berkeley National Laboratory and a member of the Romanian Academy of Sciences.
John William Harris is an American experimental high energy nuclear physicist and D. Allan Bromley Professor of Physics at Yale University. His research interests are focused on understanding high energy density QCD and the quark–gluon plasma created in relativistic collisions of heavy ions. Dr. Harris collaborated on the original proposal to initiate a high energy heavy ion program at Cern in Geneva, Switzerland, has been actively involved in the CERN heavy ion program and was the founding spokesperson for the STAR collaboration at RHIC at Brookhaven National Laboratory in the U.S.
Sergei Voloshin is a Russian-American experimental high-energy nuclear physicist and Professor of Physics at Wayne State University. He is best known for his work on event-by-event physics in heavy ion collisions.
Paolo Giubellino is an experimental particle physicist working on High-Energy Nuclear Collisions. Currently he is the joint Scientific Managing Director of the Facility for Antiproton and Ion Research (FAIR) and the GSI Helmholtz Centre for Heavy Ion Research (GSI) and Professor at the Institute of Nuclear Physics of the Technische Universität Darmstadt.
Bedangadas Mohanty is an Indian physicist specialising in experimental high energy physics, and is affiliated to National Institute of Science Education and Research, Bhubaneswar. He has been awarded the Infosys Prize in Physical Sciences for 2021 that was announced on 2 December 2021. He was awarded the Shanti Swarup Bhatnagar Prize for Science and Technology in 2015, the highest science award in India, in the physical sciences category. He has been elected as the fellow of the Indian National Science Academy, New Delhi, Indian Academy of Sciences, Bangalore and National Academy of Sciences, India. In 2020, he was elected as a fellow of American Physical Society.
Shyam Sunder Kapoor is an Indian nuclear physicist and a former director of Bhabha Atomic Research Centre. Known for his research on fission and heavy-ion physics, Kapoor is an elected fellow of all the three major Indian science academies – Indian Academy of Sciences, Indian National Science Academy and National Academy of Sciences, India – as well as the Institute of Physics. The Council of Scientific and Industrial Research, the apex agency of the Government of India for scientific research, awarded him the Shanti Swarup Bhatnagar Prize for Science and Technology, one of the highest Indian science awards, for his contributions to Physical Sciences in 1983.
Olga Evdokimov is a Russian born professor of physics at the University of Illinois, Chicago (UIC). She is a High Energy Nuclear Physicist, who currently collaborates on two international experiments; the Solenoidal Tracker At RHIC (STAR) experiment at the Relativistic Heavy Ion Collider (RHIC), Brookhaven National Laboratory, Upton, New York and the Compact Muon Solenoid (CMS) experiment at the LHC, CERN, Geneva, Switzerland.
Emanuele Quercigh is an Italian particle physicist who works since 1964 at CERN, most known for the discovery of quark-gluon plasma (QGP). Quercigh moved as a child to Friuli with his mother and his younger brother after the early death of his father. Quercigh studied physics at the University of Milan in Italy, where he became assistant of professor Giuseppe Occhialini in 1959.
Torleif Erik Oskar Ericson is a Swedish nuclear theoretical physicist. He is known for 'Ericson fluctuations' and the 'Ericson-Ericson Lorentz-Lorenz effect'. His research has nurtured the link between nuclear and particle physics.
Reinhard Stock is a German experimental physicist, specializing in heavy-ion physics.
The Underground Area 6 (UA6), also referred to as PHOTONS, experiment was a high-energy physics experiment at the Proton-Antiproton Collider, a modification of the Super Proton Synchrotron (SPS), at CERN. The experiment ran from 1984 to 1990, with the purpose of studying inclusive electromagnetic final states and lambda production in proton-antiproton and proton-proton interactions. Towards the end of its run it focused more on direct-photon and J/ψ production. The experiment is complementary to the UA1, UA2 and CDF experiments.
Photon Multiplicity Detector (PMD) is a detector used in the measurement of the multiplicity and spatial distribution of photons produced in nucleus - nucleus collisions. In short form, it is denoted by PMD. It was incorporated in the WA93 experiment. The funding for research and development of the design of PMD was done by the Department of Atomic Energy (DAE) and the Department of Science and Technology (DST) of the Government of India. The detector was constructed in the collaboration of Variable Energy Cyclotron Centre in Kolkata, Institute of Physics in Bhubaneswar and group of universities at Chandigarh, Jaipur and Jammu.
References
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- ↑ Viyogi, Y. P.; Aggarwal, M. M.; Badyal, S. K.; Bhalla, K. B.; Bhatia, V. S.; Chattopadhyay, S.; Das, A. C.; Devanand; Mazumdar, M. R. Dutta; van Eijndhoven, Nick; Ganti, Murthy S.; Garcha, B. S.; Ghosh, T. K.; Gupta, S. K.; Gutbrod, H. H. (1994-01-03). "Photon multiplicity measurements in nucleus-nucleus collisions at 200 A GeV". Nuclear Physics A. 566: 623–628. doi:10.1016/0375-9474(94)90708-0. ISSN 0375-9474.
- ↑ Viyogi, Y. P. (1993-07-01). "Ultra-relativistic heavy ion experiments: a perspective". Pramana. 41 (1): 359–370. doi:10.1007/BF02908095. ISSN 0973-7111.
- ↑ Priyadarshini, Subhra (2011-04-26). "Indian scientists in antimatter discovery". Nature India. doi:10.1038/nindia.2011.58.
- ↑ Agakishiev, H.; Aggarwal, M. M.; Ahammed, Z.; Alakhverdyants, A. V.; Alekseev, I.; Alford, J.; Anderson, B. D.; Anson, C. D.; Arkhipkin, D.; Averichev, G. S.; Balewski, J.; Beavis, D. R.; Behera, N. K.; Bellwied, R.; Betancourt, M. J. (2011). "Observation of the antimatter helium-4 nucleus". Nature. 473: 353. doi:10.1038/nature10079.