2024 Fermi

But how these so-called "Fermi bubbles" arose was a mystery. A pair of gigantic gamma-ray bubbles centered on the core of the Milky Way galaxy were discovered by the Fermi Gamma-ray Space .... Delia

Fermi Data. This is the portal to the Fermi data and the software to analyze them. It contains information about: Data Policy - a summary of the policies governing the release of Fermi science data. As a resource for proposers the Fermi LAT consortium, through an agreement with NASA, has provided a source catalog based on data from the first ...Fermi hay fecmi là một nguyên tố kim loại tổng hợp thuộc nhóm actini có tính phóng xạ cao, có ký hiệu Fm và số nguyên tử là 100. Fermi được tạo ra bằng cách bắn phá hạt nhân plutoni bởi các neutron , và là nguyên tố siêu urani thứ 8.Apr 2, 2014 · Enrico Fermi was born in Rome, Italy, on September 29, 1901, the third child of Alberto and Ida de Gattis Fermi. Ida was a remarkable woman, trained as a teacher, highly intelligent and a major ... Enrico Fermi’s and Leo Szilard’s skills were complementary, but their personalities clashed. They collaborated on their last joint experiment in May 1939, only five months after the discovery of nuclear fission and more than three years before the start-up of Chicago Pile-1 on December 2, 1942.Enrico Fermi på 1940-talet. Enrico Fermi, född 29 september 1901 i Rom, död 28 november 1954 i Chicago, USA, var en italiensk fysiker som 1938 belönades med Nobelpriset i fysik. Han är bland annat känd för att ha varit central inom utvecklingen av kärnkraften och atombomben. Han blev amerikansk medborgare i juli 1944.Apr 2, 2014 · Enrico Fermi was born in Rome, Italy, on September 29, 1901, the third child of Alberto and Ida de Gattis Fermi. Ida was a remarkable woman, trained as a teacher, highly intelligent and a major ... Fermi sphere, and the factor 2 is from spin degeneracy. The electron density n is defined by 3 3 2 1 kF V N n The Fermi wavenumber kF is given by k 3 2n 1/3 F . (9) The Fermi energy is given by 2 2/3 2 3 2 n F m . (10) The Fermi velocity is 3 2n 1/3 m m k v F F . (11) The Fermi temperature TF is defined by B F F k T .The Fermi Level is defined at every temperature, not only at absolute zero temperature. 3. Fermi Energy is the kinetic energy difference between the lowest and highest occupied single-electron states. The Fermi Level corresponds to the total kinetic energy and potential energy of the thermodynamic system. 4.The Fermi data released to the scientific community is governed by the data policy. The released instrument data for the GBM, along with LAT source lists, can be accessed through the Browse interface specific to Fermi. LAT photon data can be accessed through the LAT data server . The FITS files can also be downloaded from the Fermi FTP site.In physics or engineering education, a Fermi problem (or Fermi quiz, Fermi question, Fermi estimate ), also known as a order-of-magnitude problem (or order-of-magnitude estimate, order estimation ), is an estimation problem designed to teach dimensional analysis or approximation of extreme scientific calculations, and such a problem is usually ...LAT 8-year Source Catalog (4FGL) The Large Area Telescope (LAT) on board NASA's Fermi Gamma-ray Space Telescope (launched June 11, 2008) surveys the entire sky each day. This web page presents the fourth full catalog of LAT sources, based on 8 years of survey data and the 50 MeV-1 TeV range. For a full explanation about the catalog and its ... Feb 10, 2016 · The Fermi Gamma-ray Space Telescope. Click on the images or topic name for information about these science topics. April 26, 2023. Office of Science. Department of Energy Announces Fermi Award Ceremony. The Biden-Harris Administration will be honoring Darleane C. Hoffman and Gabor A. Somorjai as recipients of the 2023 Enrico Fermi Presidential Award in a virtual ceremony June 6th, 2023, at 3:00 p.m. Pacific Time. The Enrico Fermi Presidential Award is one ...However, in July 1968, DTE Energy announced plans to build a second nuclear reactor. This one would be a General Electric boiling water reactor. Fermi II had the odds stacked against it, while it didn't have the same issues that Fermi I did. Citizen activists still had a bad taste in their mouths and were quick to turn against Fermi II as well. The Fermi surface is the surface in the reciprocal space (the dual of the real space you live in) delimitating the fermionic occupied states from the fermionic unoccupied ones at zero temperature. So it is a momentum ( k k) construction rather than an energy construction.Enrico Fermi, (born Sept. 29, 1901, Rome, Italy—died Nov. 28, 1954, Chicago, Illinois, U.S.), Italian-born American scientist who was one of the chief architects of the nuclear age. He developed the mathematical statistics required to clarify a large class of subatomic phenomena, explored nuclear transformations caused by neutrons, and ...The fermi is a unit of measurement of length. A fermi is equivalent to a femtometer, and is the older non–SI measurement unit of length, in honour of Italian physicist Enrico Fermi (29 September 1901 — 28 November 1954), since it is a typical length-scale of, and often referenced in nuclear physics. Femtometer is a derived metric ... Fermi 2 Power Plant began commercial operation in 1988 and has since produced more than 200 billion kilowatt hours of electricity for DTE Energy customers. In 2001, Fermi 2 Power Plant was the first nuclear power plant in the state to achieve Clean Corporate Citizen (C3) status. The Michigan Department of Environmental Quality's voluntary C3 ... Su importante trabajo como físico fue galardonado en 1938 con el Premio Nobel de Física, por sus trabajos referentes a la radiactividad inducida. En sus comienzos como físico, Fermi se centró en el trabajo teórico, desarrollando importantes contribuciones a la teoría cuántica, la física de partículas y la mecánica estadística.The Fermi Science Support Center (FSSC) runs the guest investigator program, creates and maintains the mission time line, provides analysis tools for the scientific community, and archives and serves the Fermi data. This web site is the portal to Fermi for all guest investigators. This view shows the entire sky at energies greater than 1 GeV ...Su importante trabajo como físico fue galardonado en 1938 con el Premio Nobel de Física, por sus trabajos referentes a la radiactividad inducida. En sus comienzos como físico, Fermi se centró en el trabajo teórico, desarrollando importantes contribuciones a la teoría cuántica, la física de partículas y la mecánica estadística.LAT 8-year Source Catalog (4FGL) The Large Area Telescope (LAT) on board NASA's Fermi Gamma-ray Space Telescope (launched June 11, 2008) surveys the entire sky each day. This web page presents the fourth full catalog of LAT sources, based on 8 years of survey data and the 50 MeV-1 TeV range. For a full explanation about the catalog and its ...May 20, 2022 · The analysis threads are part of a hierarchical documentation set offered in support of Fermi data analysis. The threads are basically "cookbook" analysis examples which could for example be followed verbatim and then repeated but substituting data sets and observational scenarios of your own choosing. The other components of the documentation ... FERMI (Free Electron laser Radiation for Multidisciplinary Investigations) is a seeded free electron laser (FEL) source operating at Elettra Sincrotrone Trieste. FERMI is an international user facility for scientific investigations ranging from chemistry to condensed matter physics and from advanced technology to biology.The LAT team monitors flux values for a number of bright sources and transient sources that have shown flares during the mission. (See up-to-date weekly reports on flaring sources at the Fermi-LAT Flare Advocate Blog.) As sources cross the monitoring flux threshold of 1x10-6 cm-2 s-1, they are added to the monitored source list. the Fermi surface, and should be regarded as yielding only qual-itative results. 2.2.2 T6= 0 , Fermi Statistics The Fermi surface is the surface in the reciprocal space (the dual of the real space you live in) delimitating the fermionic occupied states from the fermionic unoccupied ones at zero temperature. So it is a momentum ( k k) construction rather than an energy construction.The Fermi Gamma-ray Space Telescope is a NASA spacecraft. It is in space studying the most powerful sources of radiation in the universe. Radiation is energy that is in the form of light or of moving particles that are smaller than atoms. The most extreme type of radiation is gamma rays.Fermi energy is a concept in quantum mechanics that usually refers to the energy difference between the highest and lowest occupied single-particle states in a quantum system of non-interacting fermions at absolute zero temperature. The value of the Fermi level at absolute zero temperature (−273.15 °C) is known as the Fermi energy.Kevin Burkett is the Associate Lab Director for the Particle Physics Directorate at Fermilab, which includes the Deep Underground Neutrino Experiment and neutrino, cosmic, energy frontier and muon research programs. Since joining the lab as a Wilson Fellow in 2003, he has held a number of leadership positions, including CMS Center Deputy Head ...GeForce GPUs based on Fermi architecture include: NVIDIA GeForce 410M. NVIDIA GeForce 510. NVIDIA GeForce 605. NVIDIA GeForce 610M. NVIDIA GeForce 620M. NVIDIA GeForce 705A. NVIDIA GeForce 705M. NVIDIA GeForce 710A.Fermi Overview The Fermi Gamma-ray Space Telescope is an international and multi-agency space mission that studies the cosmos in the energy range 10 keV - 300 GeV. Several successful exploratory missions in gamma-ray astronomy led to the Energetic Gamma Ray Experiment Telescope (EGRET) instrument on the Compton Gamma Ray Observatory (CGRO).The Fermi paradox is a conflict between the argument that scale and probability seem to favor intelligent life being common in the universe, and the total lack of evidence of intelligent life having ever arisen anywhere other than on Earth.Jul 19, 2023 · Produce XML spatial-spectral models of gamma-ray sources within a specified region of the sky for analysis of Fermi LAT data (works with 4FGL-DR4). Generate an XML model for a given ROI from the fourth LAT source catalog (works with DR4). This program adds RA_MOON and DEC_MOON to an spacecraft (FT2) file indicating the position of the moon ... Enrico Fermi was born in Rome, Italy, on September 29, 1901, the third child of Alberto and Ida de Gattis Fermi. Ida was a remarkable woman, trained as a teacher, highly intelligent and a major ...The Fermi Gamma-ray Space Telescope is a NASA spacecraft. It is in space studying the most powerful sources of radiation in the universe. Radiation is energy that is in the form of light or of moving particles that are smaller than atoms. The most extreme type of radiation is gamma rays.fermi: [noun] a former SI unit of length equal to 10−15 centimeters : femtometer. Oct 27, 2021 · Fermi Data. This is the portal to the Fermi data and the software to analyze them. It contains information about: Data Policy - a summary of the policies governing the release of Fermi science data. As a resource for proposers the Fermi LAT consortium, through an agreement with NASA, has provided a source catalog based on data from the first ... Topics cover much of the gamma-ray band ranging from keV-MeV transients seen with Fermi's GBM to the highest energies observed by the LAT and the very high energies observed by ground-based gamma-ray telescopes. This year's school will be held at the University of Delaware Conference Center in Lewes, Delaware, from May 31 to June 10, 2022 ...Fermi Problems. Fermi problems, named after physicist Enrico Fermi, are open-ended problems where students have to make assumptions, estimates, and educated guesses to creatively solve a problem. These complicated problem-solving exercises help students gain confidence in thinking like an engineer or scientist.Enrico Fermi Biographical . E nrico Fermi was born in Rome on 29th September, 1901, the son of Alberto Fermi, a Chief Inspector of the Ministry of Communications, and Ida de Gattis. He attended a local grammar school, and his early aptitude for mathematics and physics was recognized and encouraged by his father’s colleagues, among them A. Amidei. Prior to the launch of Fermi, the GBM team developed a GUI-based spectral analysis software tool in IDL, called RMfit, specializing in the analysis of GBM trigger data. More than 10 years later, an open source, multi-wavelength approach is desirable, integrating with the long-standing community standard fitting engine, XSPEC.The Fermi paradox is a conflict between the argument that scale and probability seem to favor intelligent life being common in the universe, and the total lack of evidence of intelligent life having ever arisen anywhere other than on Earth.Fermi sphere, and the factor 2 is from spin degeneracy. The electron density n is defined by 3 3 2 1 kF V N n The Fermi wavenumber kF is given by k 3 2n 1/3 F . (9) The Fermi energy is given by 2 2/3 2 3 2 n F m . (10) The Fermi velocity is 3 2n 1/3 m m k v F F . (11) The Fermi temperature TF is defined by B F F k T .The Nobel Prize in Physics 1938 was awarded to Enrico Fermi "for his demonstrations of the existence of new radioactive elements produced by neutron irradiation, and for his related discovery of nuclear reactions brought about by slow neutrons"Aug 31, 2023 · Campus access – Users and Badging Office START HERE. Report concerns or violations. Inside Fermilab (intranet) Visa Office. Users Executive Committee. Use Fermilab's scientific facilities. Fermilab Student and Postdoc Association. Fellowships and Ph.D. Programs. U.S. Particle Accelerator School. Fermi had a knack for making roughly-accurate estimates with very little data, and therefore such an estimate is known today as a Fermi estimate. Why bother with Fermi estimates, if your estimates are likely to be off by a factor of 2 or even 10? Often, getting an estimate within a factor of 10 or 20 is enough to make a decision.The Enrico Fermi Nuclear Generating Station is a nuclear power plant on the shore of Lake Erie near Monroe, in Frenchtown Charter Township, Michigan on approximately 1,000 acres (400 ha). All units of the plant are operated by the DTE Energy Electric Company and owned (100 percent) by parent company DTE Energy.May 15, 2020 · A pair of gigantic gamma-ray bubbles centered on the core of the Milky Way galaxy were discovered by the Fermi Gamma-ray Space Telescope 10 years ago. But how these so-called "Fermi bubbles" arose ... Nov 22, 2022 · The Fermi Gamma-ray Burst Monitor data for GRB 221009A has two periods of bad time intervals, affecting all data types. At particularly high rates the TTE data has loss due to the bandwidth limit between the instrument and the spacecraft. CTIME and CSPEC data experience deadtime but do not experience similar losses due to electronics bandwidth. Fermi Overview The Fermi Gamma-ray Space Telescope is an international and multi-agency space mission that studies the cosmos in the energy range 10 keV - 300 GeV. Several successful exploratory missions in gamma-ray astronomy led to the Energetic Gamma Ray Experiment Telescope (EGRET) instrument on the Compton Gamma Ray Observatory (CGRO).Jan 1, 2007 · Fermi Research Alliance, LLC manages and operates the Fermi National Accelerator Laboratory pursuant to Contract number DE-AC02-07CH11359 with the United States Department of Energy. The Period of Performance is January 1, 2007 through December 31, 2024. Current Conformed Prime Contract. Original Prime Contract. Substantive Contract Modifications. Operator, general information and laboratory staff 630-840-3000 Fermilab phone directory and yellow pages Visiting Fermilab 630-840-3351 [email protected] had a knack for making roughly-accurate estimates with very little data, and therefore such an estimate is known today as a Fermi estimate. Why bother with Fermi estimates, if your estimates are likely to be off by a factor of 2 or even 10? Often, getting an estimate within a factor of 10 or 20 is enough to make a decision.Fermi Overview The Fermi Gamma-ray Space Telescope is an international and multi-agency space mission that studies the cosmos in the energy range 10 keV - 300 GeV. Several successful exploratory missions in gamma-ray astronomy led to the Energetic Gamma Ray Experiment Telescope (EGRET) instrument on the Compton Gamma Ray Observatory (CGRO).Fermi, Unit 2. Location: 25 MI NE of Toledo, OH, in Region III Operator: DTE Electric Company Operating License: Issued - 07/15/1985, Expires - 03/20/2045NASA.gov brings you the latest images, videos and news from America's space agency. Get the latest updates on NASA missions, watch NASA TV live, and learn about our quest to reveal the unknown and benefit all humankind.Aug 31, 2023 · Campus access – Users and Badging Office START HERE. Report concerns or violations. Inside Fermilab (intranet) Visa Office. Users Executive Committee. Use Fermilab's scientific facilities. Fermilab Student and Postdoc Association. Fellowships and Ph.D. Programs. U.S. Particle Accelerator School. LAT 8-year Source Catalog (4FGL) The Large Area Telescope (LAT) on board NASA's Fermi Gamma-ray Space Telescope (launched June 11, 2008) surveys the entire sky each day. This web page presents the fourth full catalog of LAT sources, based on 8 years of survey data and the 50 MeV-1 TeV range. For a full explanation about the catalog and its ...Feb 13, 2023 · Prior to the launch of Fermi, the GBM team developed a GUI-based spectral analysis software tool in IDL, called RMfit, specializing in the analysis of GBM trigger data. More than 10 years later, an open source, multi-wavelength approach is desirable, integrating with the long-standing community standard fitting engine, XSPEC. The Fermi surface is the surface in the reciprocal space (the dual of the real space you live in) delimitating the fermionic occupied states from the fermionic unoccupied ones at zero temperature. So it is a momentum ( k k) construction rather than an energy construction. Gamma-ray Burst Monitor (GBM) The GBM includes two sets of detectors: twelve sodium iodide (NaI) scintillators, each 12.7 cm in diameter by 1.27 cm thick, and two cylindrical bismuth germanate (BGO) scintillators, each 12.7 cm in diameter and 12.7 cm in height. The NaI detectors are sensitive in the lower end of the energy range, from a few keV ...The Fermi Science Support Center (FSSC) runs the guest investigator program, creates and maintains the mission time line, provides analysis tools for the scientific community, and archives and serves the Fermi data. This web site is the portal to Fermi for all guest investigators. This view shows the entire sky at energies greater than 1 GeV ...The Fermi Gamma-ray Space Telescope, formerly GLAST, is opening this high-energy world to exploration and helping us answer these questions. With Fermi, astronomers at long last have a superior tool to study how black holes, notorious for pulling matter in, can accelerate jets of gas outward at fantastic speeds. Physicists are able to study ... The young Enrico Fermi. Enrico Fermi was born on 29 September 1901 in Rome to a family with no scientific traditions. His passion for natural sciences, and in particular for physics, was stimulated and guided in his school years by an engineer and family friend, Adolph Amidei, who recognized Fermi’s exceptional intellectual abilities and suggested admission to Pisa’s Scuola Normale Superiore.Feb 10, 2016 · Fermi Overview. The Fermi Gamma-ray Space Telescope is an international and multi-agency space mission that studies the cosmos in the energy range 10 keV - 300 GeV. Several successful exploratory missions in gamma-ray astronomy led to the Energetic Gamma Ray Experiment Telescope (EGRET) instrument on the Compton Gamma Ray Observatory (CGRO). Jun 4, 2023 · Lia Merminga Laboratory Director. Lia Merminga began her tenure as director of Fermi National Accelerator Laboratory in April 2022. An internationally renowned accelerator physicist, Merminga previously led Fermilab's Proton Improvement Plan II (PIP-II) project, an essential enhancement to Fermilab’s accelerator complex that will provide powerful, high-intensity proton beams, enable the ... Enrico Fermi ( Italian: [enˈriːko ˈfermi]; 29 September 1901 – 28 November 1954) was an Italian and later naturalized American physicist, renowned for being the creator of the world's first nuclear reactor, the Chicago Pile-1, and a member of the Manhattan Project. He has been called the "architect of the nuclear age " [1] and the ... Sep 22, 2020 · Fermilab's 6,800-acre site is located in Batavia, Illinois, and is managed by the Fermi Research Alliance LLC for the U.S. Department of Energy Office of Science. FRA is a partnership of the University of Chicago and Universities Research Association Inc., a consortium of 89 research universities. Fermi sphere, and the factor 2 is from spin degeneracy. The electron density n is defined by 3 3 2 1 kF V N n The Fermi wavenumber kF is given by k 3 2n 1/3 F . (9) The Fermi energy is given by 2 2/3 2 3 2 n F m . (10) The Fermi velocity is 3 2n 1/3 m m k v F F . (11) The Fermi temperature TF is defined by B F F k T . The Fermi Gamma-ray Space Telescope, formerly GLAST, is opening this high-energy world to exploration and helping us answer these questions. With Fermi, astronomers at long last have a superior tool to study how black holes, notorious for pulling matter in, can accelerate jets of gas outward at fantastic speeds.The Fermi energy of a (n-doped) semiconductor is typically rather close to the band edge. In fact, by controlling the doping, it can be made it as close to the band edge as we want. On the other hand, in metal, where the conduction band is partially filled with electrons, the Fermi energy is necessarily quite big.Su importante trabajo como físico fue galardonado en 1938 con el Premio Nobel de Física, por sus trabajos referentes a la radiactividad inducida. En sus comienzos como físico, Fermi se centró en el trabajo teórico, desarrollando importantes contribuciones a la teoría cuántica, la física de partículas y la mecánica estadística. This is a Federal computer (and/or it is directly connected to a Fermilab local network system) that is the property of the United States Government. It is for authorized use only. Users (authorized or unauthorized) have no explicit or implicit expectation of privacy.Dec 5, 2021 · Fermi died four years later, in 1954, so did not have long to ponder the question. But his idea has sparked whole fields of science hoping to solve the problem, including the search for ... IFermi is a Python (3.6+) library and set of command-line tools for the generation, analysis, and visualisation of Fermi surfaces and Fermi slices. The goal of the library is to provide fully featured FermiSurface and FermiSlice objects that allow for easy manipulation and analysis. The main features include:Fermi 2 Power Plant began commercial operation in 1988 and has since produced more than 200 billion kilowatt hours of electricity for DTE Energy customers. In 2001, Fermi 2 Power Plant was the first nuclear power plant in the state to achieve Clean Corporate Citizen (C3) status. The Michigan Department of Environmental Quality's voluntary C3 ...Nov 15, 2021 · The Fermi energy of a (n-doped) semiconductor is typically rather close to the band edge. In fact, by controlling the doping, it can be made it as close to the band edge as we want. On the other hand, in metal, where the conduction band is partially filled with electrons, the Fermi energy is necessarily quite big. Fermi hay fecmi là một nguyên tố kim loại tổng hợp thuộc nhóm actini có tính phóng xạ cao, có ký hiệu Fm và số nguyên tử là 100. Fermi được tạo ra bằng cách bắn phá hạt nhân plutoni bởi các neutron , và là nguyên tố siêu urani thứ 8.

The analysis threads are part of a hierarchical documentation set offered in support of Fermi data analysis. The threads are basically "cookbook" analysis examples which could for example be followed verbatim and then repeated but substituting data sets and observational scenarios of your own choosing. The other components of the documentation .... Atandt phone outage today 2022

Fermi Research Alliance, LLC manages and operates the Fermi National Accelerator Laboratory pursuant to Contract number DE-AC02-07CH11359 with the United States Department of Energy. The Period of Performance is January 1, 2007 through December 31, 2024. Current Conformed Prime Contract. Original Prime Contract. Substantive Contract Modifications.Fermi problem. In physics or engineering education, a Fermi problem (or Fermi quiz, Fermi question, Fermi estimate ), also known as a order-of-magnitude problem (or order-of-magnitude estimate, order estimation ), is an estimation problem designed to teach dimensional analysis or approximation of extreme scientific calculations, and such a ...Apr 2, 2014 · Enrico Fermi was born in Rome, Italy, on September 29, 1901, the third child of Alberto and Ida de Gattis Fermi. Ida was a remarkable woman, trained as a teacher, highly intelligent and a major ... The LAT team monitors flux values for a number of bright sources and transient sources that have shown flares during the mission. (See up-to-date weekly reports on flaring sources at the Fermi-LAT Flare Advocate Blog.) As sources cross the monitoring flux threshold of 1x10-6 cm-2 s-1, they are added to the monitored source list.Enrico Fermi på 1940-talet. Enrico Fermi, född 29 september 1901 i Rom, död 28 november 1954 i Chicago, USA, var en italiensk fysiker som 1938 belönades med Nobelpriset i fysik. Han är bland annat känd för att ha varit central inom utvecklingen av kärnkraften och atombomben. Han blev amerikansk medborgare i juli 1944. A pair of researchers, one with the Carnegie Institution for Science, the other with California Institute of Technology, has developed a possible solution to the Fermi Paradox. In their paper ...LAT 8-year Source Catalog (4FGL) The Large Area Telescope (LAT) on board NASA's Fermi Gamma-ray Space Telescope (launched June 11, 2008) surveys the entire sky each day. This web page presents the fourth full catalog of LAT sources, based on 8 years of survey data and the 50 MeV-1 TeV range. For a full explanation about the catalog and its ... Nov 1, 2011 · Large Area Telescope (LAT) The primary interaction of photons in the Fermi energy range with matter is pair conversion. This process forms the basis for the underlying measurement principle by providing a unique signature for gamma rays, which distinguishes them from charged cosmic rays whose flux is as much as 10 5 times larger, and allowing a determination of the incident photon directions ... The Fermi Gamma-ray Space Telescope, formerly GLAST, is opening this high-energy world to exploration and helping us answer these questions. With Fermi, astronomers at long last have a superior tool to study how black holes, notorious for pulling matter in, can accelerate jets of gas outward at fantastic speeds.Feb 10, 2016 · The Fermi Gamma-ray Space Telescope. Click on the images or topic name for information about these science topics. The Fermi surface is the surface in the reciprocal space (the dual of the real space you live in) delimitating the fermionic occupied states from the fermionic unoccupied ones at zero temperature. So it is a momentum ( k k) construction rather than an energy construction. Fermi announced that this was much too low, and the real number was about one in ten. What followed was a sparring match as both men criticized and revised their rough estimates of the likelihood ....

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