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Photon Multiplicity Detector (PMD)
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. Description A PMD typically consists of two main layers Veto Detector and Preshower Detector. Veto Detector layer is designed to reject charged particles. Photons pass through a converter in Preshower Detector layer, initiating an electromagnetic shower. The detector then measures the number of cells activated by the shower, providing information about t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WA93 Experiment
WA93 experiment (''Synonym'': Light Universal Detector or LUD) was a detector experiment conducted at CERN for studying the correlations between photons and charged particles. It was an experimental program of CERN and part of the research programme Super Proton Synchrotron, SPS. The experiment was majorly conducted by the Indian High-Energy Heavy Ion Physics Team at CERN-SPS. For measurement of the multiplicity and the rapidity and azimuthal distributions of photons in ultra-relativistic heavy ion collisions, Photon Multiplicity Detector (PMD), Photon Multiplicity Detector was implemented in the experiment. The experiment was led by Indian physicist Y. P. Viyogi, Y P Viyogi. Hans H. Gutbrod was the spokesperson of the experimental project. The experimental project was approved on 22 November 1990. The experiment was completed on 9 May 2002. Description WA93 experiment was a Particle physics, high-energy physics experiment conducted at CERN's Super Proton Synchrotron (SPS). It ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chandigarh
Chandigarh is a city and union territory in northern India, serving as the shared capital of the states of Punjab and Haryana. Situated near the foothills of the Shivalik range of Himalayas, it borders Haryana to the east and Punjab in the remaining directions. Chandigarh constitutes the bulk of the Chandigarh Capital Region or Greater Chandigarh, which also includes the adjacent satellite cities of Panchkula in Haryana and Mohali in Punjab. It is located 260 km (162 miles) northwest of New Delhi and 229 km (143 miles) southeast of Amritsar and 104 km (64 miles) southwest of Shimla. Chandigarh is one of the earliest planned cities in post independence India and is internationally known for its architecture and urban design. The master plan of the city was prepared by Swiss-French architect Le Corbusier, which built upon earlier plans created by the Polish architect Maciej Nowicki and the American planner Albert Mayer. Narinder Singh Lamba, in the capacity ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nucleon
In physics and chemistry, a nucleon is either a proton or a neutron, considered in its role as a component of an atomic nucleus. The number of nucleons in a nucleus defines the atom's mass number. Until the 1960s, nucleons were thought to be elementary particles, not made up of smaller parts. Now they are understood as composite particles, made of three quarks bound together by the strong interaction. The interaction between two or more nucleons is called internucleon interaction or nuclear force, which is also ultimately caused by the strong interaction. (Before the discovery of quarks, the term "strong interaction" referred to just internucleon interactions.) Nucleons sit at the boundary where particle physics and nuclear physics overlap. Particle physics, particularly quantum chromodynamics, provides the fundamental equations that describe the properties of quarks and of the strong interaction. These equations describe quantitatively how quarks can bind together into protons ... [...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] |
Large Hadron Collider
The Large Hadron Collider (LHC) is the world's largest and highest-energy particle accelerator. It was built by the CERN, European Organization for Nuclear Research (CERN) between 1998 and 2008, in collaboration with over 10,000 scientists, and hundreds of universities and laboratories across more than 100 countries. It lies in a tunnel in circumference and as deep as beneath the France–Switzerland border near Geneva. The first collisions were achieved in 2010 at an energy of 3.5 tera-electronvolts (TeV) per beam, about four times the previous world record. The discovery of the Higgs boson at the LHC was announced in 2012. Between 2013 and 2015, the LHC was shut down and upgraded; after those upgrades it reached 6.5 TeV per beam (13.0 TeV total collision energy). At the end of 2018, it was shut down for maintenance and further upgrades, and reopened over three years later in April 2022. The collider has four crossing points where the accelerated particles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rapidity
In special relativity, the classical concept of velocity is converted to rapidity to accommodate the limit determined by the speed of light. Velocities must be combined by Einstein's velocity-addition formula. For low speeds, rapidity and velocity are almost exactly proportional but, for higher velocities, rapidity takes a larger value, with the rapidity of light being infinite. Mathematically, rapidity can be defined as the hyperbolic angle that differentiates two frames of reference in relative motion, each frame being associated with distance and time coordinates. Using the inverse hyperbolic function , the rapidity corresponding to velocity is where is the speed of light. For low speeds, by the small-angle approximation, is approximately . Since in relativity any velocity is constrained to the interval the ratio satisfies . The inverse hyperbolic tangent has the unit interval for its domain and the whole real line for its image; that is, the interval maps ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudorapidity
In experimental particle physics, pseudorapidity, \eta, is a commonly used spatial coordinate describing the angle of a particle relative to the beam axis. It is defined as :\eta \equiv -\ln\left tan\left(\frac\right)\right where \theta is the angle between the particle three-momentum \mathbf and the positive direction of the beam axis.Introduction to High-Energy Heavy-Ion Collisions, by Cheuk-Yin Wong, See page 24 for definition of rapidity. Inversely, :\theta = 2\arctan\left(e^\right). As a function of three-momentum \mathbf, pseudorapidity can be written as :\eta = \frac \ln \left(\frac\right) = \operatorname\left(\frac \right), where p_\text is the component of the momentum along the beam axis (i.e. the ''longitudinal'' momentum – using the conventional system of coordinates for hadron collider physics, this is also commonly denoted p_z). In the limit where the particle is travelling close to the speed of light, or equivalently in the approximation that the mass of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ALICE Experiment
A Large Ion Collider Experiment (ALICE) is one of nine Particle detector, detector experiments at the Large Hadron Collider (LHC) at CERN. It is designed to study the conditions thought to have existed immediately after the Big Bang by measuring the properties of quark-gluon plasma. Introduction ALICE is designed to study High-energy nuclear physics, high-energy collisions between lead atomic nucleus, nuclei. These collisions mimic the extreme temperature and energy density that would have been found in the fractions of a second after the Big Bang by forming a quark–gluon plasma, a state of matter in which quarks and gluons are Bound state, unbound. Understanding quark deconfinement and the properties of quark-gluon plasma are key issues in quantum chromodynamics (QCD) and the study of the strong interaction, strong force. The results obtained by ALICE support our understanding of complex phenomena such as how elementary particles interact, color confinement and chiral sym ... [...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] |
Jammu
Jammu () is a city in Indian-administered Jammu and Kashmir (union territory), Jammu and Kashmir in the disputed Kashmir region.The application of the term "administered" to the various regions of Kashmir and a mention of the Kashmir dispute is supported by the WP:TERTIARY, tertiary sources (a) through (d), reflecting WP:DUE, due weight in the coverage. Although "controlled" and "held" are also applied neutrally to the names of the disputants or to the regions administered by them, as evidenced in sources (f) through (h) below, "held" is also considered politicised usage, as is the term "occupied," (see (i) below). (a) (subscription required) Quote: "Kashmir, region of the northwestern Indian subcontinent ... has been the subject of dispute between India and Pakistan since the partition of the Indian subcontinent in 1947. The northern and western portions are administered by Pakistan and comprise three areas: Azad Kashmir, Gilgit, and Baltistan, the last two being part of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jaipur
Jaipur (; , ) is the List of state and union territory capitals in India, capital and the List of cities and towns in Rajasthan, largest city of the north-western States and union territories of India, Indian state of Rajasthan. , the city had a population of 3.1 million, making it the List of cities in India by population, tenth most populous city in the country. Located from the national capital New Delhi, Jaipur is also known as the ''Pink City'' due to the dominant color scheme of its buildings in the old city. Jaipur was founded in 1727 by Sawai Jai Singh, Sawai Jai Singh II, the Kachhwaha, Kachhwaha Rajput ruler of Amer, India, Amer, after whom the city is named. It is one of the earliest planned cities of modern India, designed by Vidyadhar Bhattacharya. During the British Raj, British colonial period, the city served as the capital of Jaipur State. After Independence of India, Indian independence in 1947, Jaipur became the capital of the newly formed state of Rajas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bhubaneswar
Bhubaneswar () is the capital and the largest city of the States and territories of India, Indian state of Odisha. It is located in the Khordha district. The suburban region, especially the old town, was historically often depicted as ''Chakra Khetra'' and ''Ekamra Khetra'' (Area adorned with a mango tree). Bhubaneswar is dubbed the "Temple City", a nickname earned because of many temples which are standing there. In contemporary times, the city is a hub of sports, tourism and IT in the country. Although the modern city of Bhubaneswar was formally established in 1948, the history of the areas in and around the present-day city can be traced to the 1st century BCE. It is a confluence of Hinduism, Hindu, Buddhism, Buddhist and Jainism, Jain heritage and includes several Kalinga architecture, Kalingan temples, many of them from 6th–13th century CE. With Puri and Konark, it forms the "Swarna Tribhuja" (), one of Eastern India's most visited destinations.Ramesh Prasad Mohapatra, ''A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
