Gamma energies. Medical search. Frequent questions

Very-high-energy gamma ray (VHEGR) denotes gamma radiation with photon energies of 100 GeV (gigaelectronvolt) to 100 TeV (teraelectronvolt), i.e., 1011 to 1014 electronvolts. (wikipedia.org)
At energies above 100 TeV, gamma-rays suffer strong absorption from pair production with photons from the cosmic microwave background radiation that strongly reduces their mean free path [ 3 ]. (hindawi.com)
Gamma radiation from space has very high energy levels. (astronomy.com)
Gamma-ray observatories, such as the Very Energetic Radiation Imaging Telescope Array System (VERITAS) and the High-Altitude Water Cherenkov Gamma-Ray Observatory (HAWC), can observe over effective areas as large as a football field by detecting the products of these particle cascades at ground level. (astronomy.com)
These flashes, also called pulses of radiation, can be searched for in different energy bands of the electromagnetic spectrum. (scitechdaily.com)
On their outward journey, the electrons acquire energy and release it in the form of the observed radiation beams," says Bronek Rudak from the Nicolaus Copernicus Astronomical Center (CAMK PAN) in Poland, also a co-author. (scitechdaily.com)
But this is not the end of the story: using deep observations with H.E.S.S., a new radiation component at even higher energies has now been discovered, with energies of up to tens of tera-electronvolts (TeV). (scitechdaily.com)
Blazars, active galactic nuclei with relativistic jets pointed almost directly at Earth, are powerful and highly variable sources of nonthermal electromagnetic radiation, including very-high-energy gamma rays. (columbia.edu)
We can detect these gamma rays with arrays of imaging atmospheric Cherenkov telescopes (IACTs), including the Very Energetic Radiation Imaging Telescope Array System (VERITAS) and the upcoming Cherenkov Telescope Array (CTA). (columbia.edu)
We present the results of our improved analysis of the very-high-energy gamma-ray emission above 2 TeV from the GC using 125 hr of data taken with the Very Energetic Radiation Imaging Telescope Array System imaging-atmospheric Cerenkov telescope between 2010 and 2018. (umn.edu)
Black holes, pulsars, remnants of exploded stars - these celestial bodies accelerate particles to enormous energies and emit high-energy gamma radiation. (mpg.de)
It is shown that such a quasi-stationary model could explain the bulk of the gamma -radiation features observed except for the gamma -ray modulations with the pulsar spin. (worktribe.com)
BDKG-05S Scintillation Gamma Radiation Probe includes SC-38.1×38.1 (ScintiClear Ø1.5"x1.5") detector assembly with LED temperature stabilization, digital MCA, and RS232/RS485/USB communication interface. (zievert.com)
When high-energy radiation from space enters Earth's upper atmosphere, it interacts with naturally occurring atmospheric molecules to produce the isotope carbon-14. (symmetrymagazine.org)
As they interact with matter in and around the star, the jets produce a spike of high-energy radiation ( CERN Courier December 2005 p20 ). (cerncourier.com)
To develop processes, techniques, protocols for radiation-grafted membranes for cleaner environment and sustainable energy development. (iaea.org)
Radiation is energy that comes from a source and travels through space at the speed of light. (cdc.gov)
Radiation with the highest energy includes forms like ultraviolet radiation, x-rays, and gamma rays. (cdc.gov)
Ionizing Radiation is the energy that comes out of a radioactive atom. (cdc.gov)
Radioactive atoms can give off four types of ionizing radiation: alpha particles, beta particles, gamma rays, and neutrons. (cdc.gov)
Of the different types and sources of ionizing radiation, this profile will discuss the three main types: alpha, beta, and gamma radiation. (cdc.gov)
Ionizing radiation is energy that is carried by several types of particles and rays given off by radioactive material, x ray machines, and fuel elements in nuclear reactors. (cdc.gov)
A radionuclide is a radioactive form of an element, which means it is an unstable atom that becomes more stable by releasing energy as radiation. (msdmanuals.com)
But high-energy astrophysics also gives us important information about our own galaxy the Milky Way, neutron stars, supernovae, and stars like out own Sun, which emit a lot of high-energy radiation. (lu.se)
The experiment chamber is flooded with electromagnetic radiation up to gamma rays (from scattering of the high energy electrons). (lu.se)
The amount of energy deposited in tissue by an exposure to ionizing radiation ("a dose") can be expressed in joules per kilogram. (who.int)
However, simply measuring the amount of energy absorbed by tissue from ionizing radiation is not enough to predict the amount of potential harm. (who.int)
There are different kinds of ionizing radiation, such as alpha, beta and gamma rays and neutrons. (who.int)

Sources that produce cosmic rays will almost certainly produce gamma rays as well, as the cosmic ray particles interact with nuclei or electrons to produce photons or neutral pions which in turn decay to ultra-high-energy photons. (wikipedia.org)
From the three families of leptons, the electron neutrinos are unfavourable for this type of study because the produced high-energy electrons initiate electromagnetic showers that are easily absorbed by the target mass shortly after production. (hindawi.com)
Gamma rays result from the interactions of electrons and protons that have been accelerated to almost the speed of light. (astronomy.com)
The researchers think that infrared light particles (photons) from the poles of the pulsar are boosted to gamma-ray energies (blue) by fast electrons. (scitechdaily.com)
However, to attain these energies, the electrons might have to travel even farther than the magnetosphere, yet the rotational emission pattern needs to remain intact. (scitechdaily.com)
The absorption of the gamma ray inside the scintillation crystal and the production of photo-electrons inside the PMT are essentially random processes, thus the Poisson and Gaussian statistical distribution could be applied to explain the broadening of the lines. (physicsopenlab.org)
To a first approximation the gamma ray line width (FWHM) is 2.35σ , where σ is the standard deviation of the Gaussian distribution related to the statistical fluctuations in the number of photo-electrons, Ne , that are collected from the photocathode of the phototube. (physicsopenlab.org)
In space, supernova remnants and other cosmic accelerators can boost subatomic particles such as electrons, photons and protons to extreme energies , much higher than those achieved in the most powerful earthly particle accelerators ( SN: 10/1/05, p. 213 ). (sciencenews.org)
However, there is some ambiguity in using gamma rays to study this, as high-energy gamma rays can also be produced via other mechanisms, such as lower-energy photons scattering off of electrons, which commonly occurs near pulsars. (lanl.gov)
the limit is about 1e8 MeV for hadronic interactions (assuming the proton spectrum has be computed to higher energies), and similar for inverse Compton but then you need electrons of higher energy which are diffiicult to treat due to their very short lifetimes. (stanford.edu)
Instead, electrons are used in an intermediate step to transfer energy from the laser to protons. (lu.se)
Electrons are present in large numbers (some of whom accompany the proton beam, charge neutralizing it) with energies up to several mega electronvolt. (lu.se)

Extensive air showers of particles can be detected for gamma rays above 100 TeV. (wikipedia.org)
Air showers of elementary particles made by gamma rays can also be distinguished from those produced by cosmic rays by the much greater depth of shower maximum, and the much lower quantity of muons. (wikipedia.org)
Higher-energy particles produce higher-energy gamma rays, so one limitation to the maximum gamma-ray energy is the maximum energy to which particles can be accelerated. (astronomy.com)
When a gamma ray strikes the top of the atmosphere, it initiates a cascade of particles, which in turn produces a flash of blue light. (astronomy.com)
Higher-energy gamma rays certainly exist in the universe, since particles with much higher energies have been observed. (astronomy.com)
If a gamma ray on its way to Earth collides with lower-energy light in the EBL, it converts into a pair of particles and is lost to astronomers. (ifae.es)
The Tibet AS-gamma experiment caught multiple particles of light - or photons - from the nebula with energies higher than 100 trillion electron volts , researchers report in a study accepted in Physical Review Letters . (sciencenews.org)
While higher-energy astrophysical particles have been previously detected, this is the first time specific galactic sources have been pinpointed. (lanl.gov)
When these gamma rays strike molecules in the atmosphere they produce showers of energetic particles. (lanl.gov)
Most radionuclides release high-energy photons as gamma rays but PET uses radionuclides that release particles called positrons. (msdmanuals.com)

A flux of 10−7 photons per square meter per second can be detected with current technology, provided the energy is above 0.1 TeV. (wikipedia.org)
These two emitted individual photons with the highest energies ever seen . (syfy.com)
One of them zapped out gamma rays with energies of up to a teraelectronvolt - equivalent to about 500 billion times the energy of photons our eyes detect! (syfy.com)
HESS doesn't see gamma rays directly, but is sensitive to the glow in our own atmosphere when these super-high-energy photons slam into the air, moving faster than light in that medium (which is slower than light speed in a vacuum, so no physical laws are broken here). (syfy.com)
It found gamma rays from GRC 180720B that were 440 billion electron Volts (typical visible light photons that we see range from 2-3 eV, so there are extremely energetic photons), the highest ever seen. (syfy.com)
Incredibly, HESS couldn't even observe the burst until 10 hours after it occurred, but it detected photons in this energy range for another two hours. (syfy.com)
What is the theoretical limit on the energies of gamma-ray photons? (astronomy.com)
Gamma rays are destroyed when they interact with lower-energy photons. (astronomy.com)
Since the universe is full of low-energy photons from starlight and the cosmic microwave background, gamma rays are limited in the distance they can travel. (astronomy.com)
CRAB FISHING Scientists hunting for high-energy photons raining down on Earth from space have found the most energetic light yet detected. (sciencenews.org)
Although scientists have searched for photons at these energies before, they haven't succeeded in detecting such energetic photons until now, says astrophysicist Petra Huentemeyer of Michigan Technological University in Houghton, who was not involved with the research. (sciencenews.org)

GRBs emit gamma rays, the highest-energy form of light. (nasa.gov)
Gamma-ray bursts emit gamma rays as well as radio waves, optical lights, and X-rays. (scienmag.com)
All produce gamma rays with energies over 56 trillion electron volts (TeV) and three emit gamma rays extending to 100 TeV and beyond, making these the highest-energy sources ever observed in our galaxy. (lanl.gov)

Fermi's other instrument, the Gamma-ray Burst Monitor (GBM), sees the entire sky that isn't blocked by Earth and detects lower-energy emission. (nasa.gov)
Thus, in spite of the existence of a strong emission peak, earlier conclusions based on an apparent 'gamma-ray deficit', postulating the masses of the 'wide-line' clouds in the GC area to be an order of magnitude lower than indicated by naive CO interpretation, are supported. (dtu.dk)
However, the total gas mass in the Nuclear Bulge (NB) derived from the gamma-ray emission is found to be in agreement with the mass which in recent studies has been derived from molecular-line and FIR surveys. (dtu.dk)
The gamma-ray emission spectrum is peculiar and different from the spectrum of the large-scale galactic diffuse emission. (dtu.dk)
However, it is not proven that the Crab spectrum is characteristic for all young pulsars: thus, a single or a few very young pulsars (at the GC not detectable in radio emission), provided their gamma-ray emission is larger than that of the Crab pulsar by a factor of 13, are likely candidates. (dtu.dk)
In a paper to be published in the Astrophysical Journal Letters, an international team of researchers reports the first detection of very high-energy gamma-ray emission from the distant active galaxy PKS 1441+25. (ifae.es)
The very high-energy emission is attenuated on its way to Earth due to the interaction with the diffuse light filling the Universe, the extragalactic background light. (ifae.es)
Flat Spectrum Radio Quasars are enigmatic sources and scientists struggle to explain the emission of VHE gamma rays from them, observations such as those performed by MAGIC give crucial inside into those sources. (ifae.es)
Gamma rays depict the extreme Universe, but such highly energetic emission suffers absorption in the journey to the Earth due to the interaction with diffuse emission, the extragalactic background light. (ifae.es)
In order to identify the origin of this emission, a multi-messenger strategy can to be adopted: in the case of a hadronic scenario for the production of gamma-rays, neutrinos might be considered as a counterpart for the electromagnetic emission. (infn.it)
Finding one or two neutrinos originating from gamma-ray blazars in the given sample of high-energy neutrinos is consistent with previously derived limits of neutrino emission from gamma-ray blazars, indicating the sources of the majority of cosmic high-energy neutrinos remain unknown. (psu.edu)
This difference in polarization at the two wavelengths reveals detailed physical conditions of the gamma-ray burst's emission region," said Toma. (scienmag.com)
The number of sources detected may indicate that ultra-high-energy emission is a generic feature of powerful particle winds coming from pulsars embedded in interstellar gas clouds known as nebulae, and that more detections will be forthcoming. (lanl.gov)
Its identification with Cygnus X-3 is secured by the detection of its orbital period in gamma rays, as well as the correlation of the LAT flux with radio emission from the relativistic jets of Cygnus X-3. (unipd.it)
The gamma-ray emission probably originates from within the binary system, opening new areas in which to study the formation of relativistic jets. (unipd.it)
Both models predict that the episodes of pulsed gamma -ray emission may be rather rare, with a typical duration not exceeding a few hours, and that generally the frequency of pulsations should be significantly shifted from the nominal frequency of the X-ray pulsar. (worktribe.com)
An earlier event, GRB 101225A, exploded on Christmas Day 2010 and produced high-energy emission lasting at least two hours. (cerncourier.com)
Very High Energy emission at the Cosmic Gamma Ray Horizon: a. (iac.es)
95.5% of 242mAm undergoes an isomeric transition to 242Am (t½=16.02 hours) with the emission of a 48.6 keV gamma ray, and 0.5% decays by alpha emission to 238Np. (cdc.gov)

Ikhsanov, N. R. (October 1991), "Particle acceleration and main parameters of ultra-high energy gamma-ray binaries", Astrophysics and Space Science, 184 (2): 297-311, Bibcode:1991Ap&SS.184. (wikipedia.org)
Ground-based gamma-ray astronomy has a huge potential in astrophysics, particle physics and cosmology. (harvard.edu)
High-energy astrophysics plays a key role in understanding the Universe. (lu.se)
Europe holds a leading role in the research about high-energy astrophysics. (lu.se)

We find that TXS 0506+056 shows strong flux variability in the Fermi-Large Area Telescope gamma-ray band, being in an active state around the arrival of IceCube-170922A, but in a low state during the archival IceCube neutrino flare in 2014/15. (psu.edu)
The Fermi Large Area Telescope (LAT) has detected a variable high-energy source coinciding with the position of the x-ray binary and microquasar Cygnus X-3. (unipd.it)

LOS ALAMOS, N.M., Jan. 14, 2020-Nine sources of extremely high-energy gamma rays comprise a new catalog compiled by researchers with the High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory. (lanl.gov)
The HAWC Gamma-Ray Observatory consists of an array of water-filled tanks sitting high on the slopes of the Sierra Negra volcano in Puebla, Mexico, where the atmosphere is thin and offers better conditions for observing gamma rays. (lanl.gov)

Due to this, there are several dedicated instruments, both ground or space based, performing a continuous survey of the Universe characterizing gamma-ray sources, for example, the Fermi Gamma-Ray Space Telescope and the imaging atmospheric Cherenkov telescopes HESS, MAGIC, VERITAS, and FACT. (hindawi.com)
Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. (harvard.edu)
100GeV) from distant AGNs by Imaging Atmospheric Cherenkov Telescopes (IACTs) gets very complicated at high redshifts, not only because of the lower flux due to the distance of the source, but also due to the consequent absorption of gamma-rays by the extragalactic background light (EBL), affecting VHE sources at z~0.1 and beyond. (iac.es)

Green dots show the locations of 186 gamma-ray bursts observed by the Large Area Telescope (LAT) on NASA's Fermi satellite during its first decade. (nasa.gov)

This observation is hard to reconcile with the theory of the production of such pulsed gamma rays, as the international team reports today (October 5) in the journal Nature Astronomy . (scitechdaily.com)
Event-sequence time series analysis in ground-based gamma-ray astronomy. (worktribe.com)

Background: Constructed from nine years of LAT data, this map shows how the gamma-ray sky appears at energies above 10 billion electron volts. (nasa.gov)
The LAT sees about one-fifth of the sky at any time and records gamma rays with energies above 30 million electron volts (MeV) - millions of times the energy of visible light. (nasa.gov)
It also holds the record for the most gamma rays - 17 - with energies above 10 billion electron volts. (nasa.gov)
Visible light, for comparison, has just a few electron volts of energy. (sciencenews.org)

PKS 1441+25 is one of the two most distant active galaxy detected up to such extreme energies. (ifae.es)

For this reason, ultrahigh-energy neutrinos may be a better tool to study the most energetic extragalactic particle accelerators. (hindawi.com)
The first is the energy of the particle that produces the gamma ray. (astronomy.com)
The maximum particle energy therefore depends upon the magnetic field strength and the size of the acceleration region. (astronomy.com)
When a particle reaches a velocity high enough that it can escape the acceleration region, the acceleration stops, and the particle gains no further energy. (astronomy.com)
The newly cataloged astrophysical gamma-ray sources have energies about 10 times higher than can be produced using experimental particle colliders on Earth. (lanl.gov)

Gamma-rays are another cosmic probe that provides information about the acceleration mechanisms that occur in astrophysical sources. (hindawi.com)
There is no strict theoretical limit on the highest energy of astrophysical gamma rays, so far as I know, but there are some practical limitations. (astronomy.com)
This discovery opens a new observation window for detection of other pulsars in the tens of teraelectronvolt range with current and upcoming more sensitive gamma-ray telescopes, hence paving the way for a better understanding of the extreme acceleration processes in highly magnetized astrophysical objects," says Djannati-Atai. (scitechdaily.com)
Following a classification based on their luminosity and other astrophysical important features, PKS 1441+25 belongs to the Flat Spectrum Radio Quasars family and emits very energetic gamma rays from the vicinity of its central black hole. (ifae.es)
In the paper recently accepted for a publication in the Astrophysical Journal Letters, the current models of the extragalactic background light which constrain the evolution of the Universe from its middle age until today were tested for the first time up to energies never reached before for such distant galaxies. (ifae.es)
A gamma-ray burst (GRB) is a brief flash of gamma rays coming from an astrophysical source at great distances from us, often from hundreds of millions of light years away. (aavso.org)

For a decade, NASA's Fermi Gamma-ray Space Telescope has scanned the sky for gamma-ray bursts (GRBs), the universe's most luminous explosions. (nasa.gov)
This is important, because astronomers had predicted these kinds of energies could be achieved in GRBs, but it had never been seen before. (syfy.com)
That is the gamma-ray burst: An intensely high-energy pair of beams - calling them death rays is not really an exaggeration, as it's nearly impossible to exaggerate anything about GRBs - that scream outward into space. (syfy.com)
Gamma-ray bursts (GRBs) are the most luminous explosions in the universe. (astronomy.com)
Three unusually long-lasting stellar explosions discovered by NASA's Swift satellite represent a new class of gamma-ray bursts (GRBs). (cerncourier.com)
An artist's impression of two stars of very different size creating gamma-ray bursts (GRBs). (cerncourier.com)
GRBs are extremely powerful flashes of gamma rays observed from a random direction on the sky about once a day. (cerncourier.com)
While most of the thousands of GRBs observed so far fall into these two categories, there are also peculiar sub-energetic bursts ( CERN Courier September 2004 p13 ) and unrelated gamma-ray events that arise from the tidal disruption of a star by a supermassive black hole ( CERN Courier July/August 2011 p14 ). (cerncourier.com)

Very-high-energy gamma rays are of importance because they may reveal the source of cosmic rays. (wikipedia.org)
The ratio of primary cosmic ray hadrons to gamma rays also gives a clue as to the origin of cosmic rays. (wikipedia.org)
Although gamma rays could be produced near the source of cosmic rays, they could also be produced by interactions with the cosmic microwave background by way of the Greisen-Zatsepin-Kuzmin limit cutoff above 50 EeV. (wikipedia.org)
We rely on gamma rays, which are produced close to the sources of the cosmic rays, to narrow down their origins," said Kelly Malone, an astrophysicist in the Neutron Science and Technology group at Los Alamos National Laboratory and a member of the HAWC scientific collaboration. (lanl.gov)
The HAWC collaborators plan to continue searching for the sources of high-energy cosmic rays. (lanl.gov)

Instruments include the planned Cherenkov Telescope Array, GT-48 in Crimea, MAGIC on La Palma, High Energy Stereoscopic System (HESS) in Namibia VERITAS and Chicago Air Shower Array which closed in 2001. (wikipedia.org)
With the H.E.S.S. gamma-ray telescope, for example, they observe the remnants of supernovae. (mpg.de)
The Cherenkov Telescope Array will combine experimental and observatory-style approaches to investigate the universe's highest energies. (symmetrymagazine.org)

Within seconds NASA's orbiting Fermi and Swift gamma-ray satellites detected it, and sent out an automated alert to other telescopes to look for it. (syfy.com)
The discovery was made by the MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov) twin telescopes, located in the Canary island of La Palma (Spain). (ifae.es)
MAGIC collaboration pointed the telescopes to this object following a flare seen at lower energies by Fermi satellite. (ifae.es)

The detection of ultrahigh-energy neutrinos, with energies in the PeV range or above, is a topic of great interest in modern astroparticle physics. (hindawi.com)
In this work we describe the feasibility to study ultrahigh-energy neutrinos based on the Earth-skimming technique, by detecting the charged leptons produced in neutrino-nucleon interactions in a high mass target. (hindawi.com)
The first evidence of ultrahigh-energy neutrinos (in the PeV energy range) from extraterrestrial origin was recently reported [ 1 ]. (hindawi.com)
AMANDA-II was used to search for down-going muons indicative of high-energy gammas and/or neutrinos from this object. (psu.edu)

After reviewing the science of blazars and the methods used by IACTs, we investigate how gamma-ray variability can provide insight into blazars' physical properties while also complicating efforts to understand these sources as a population. (columbia.edu)
More distant blazars show a loss of higher-energy gamma rays thanks to the extragalactic background light (EBL), a 'cosmic fog' of visible and ultraviolet starlight that permeates the universe. (ifae.es)
From studies of nearby blazars, scientists know how many gamma rays should be emitted at different energies. (ifae.es)

Using the H.E.S.S. observatory in Namibia, scientists have detected exceptionally high-energy gamma rays from the Vela pulsar, challenging established theories on pulsed gamma rays from such stars. (scitechdaily.com)

It's been over 20 years since astronomers first discovered that the expansion of the Universe is accelerating thanks to dark energy. (astronomycast.com)
Some of the most powerful explosions in the Universe are gamma ray bursts, capable of blasting a beam of death halfway across the galaxy. (astronomycast.com)
Gamma-ray bursts are the most luminous explosions in the universe, allowing astrologists to observe intense gamma rays in short durations. (scienmag.com)
The first stars in the universe could be discovered if we can detect their long gamma-ray bursts. (scienmag.com)
These aggressive events are heralded by gamma rays, whichtravel straight through the universe and eventually impact on the Earth's atmosphere. (mpg.de)
Thus the study of gamma ray bursts is a study of some of the most violent events in the universe. (aavso.org)
A Friedmann-Robertson-Walker Universe was studied with a dark energy component represented by a quintessence field. (mdpi.com)
What we can learn by studying the high-energy light of the Universe. (lu.se)

Our results show that it may be feasible to perform measurements of the ultrahigh-energy neutrino flux from cosmic origin during the expected lifetime of the HAWC observatory. (hindawi.com)

The relative biological efficiency (RBE) of neutrons versus gamma rays varies inversely with neutron energy down to 0.4 MeV, where it can reach values of 20 and more. (who.int)

The energy of these gamma rays clocked in at 20 tera-electronvolts, or about ten trillion times the energy of visible light. (scitechdaily.com)

The team looked at a gamma-ray burst which occurred on December 21, 2019 (GRB191221B). (scienmag.com)

The highest-energy gamma rays that have been detected by these observatories have energies of around 50 teraelectron volts, or 50 billion times the energy of an X-ray. (astronomy.com)
PKS1441+25 and QSO B0218+357, another source recently detected by MAGIC, are the oldest VHE gamma rays ever detected from ground observatories. (ifae.es)

Artwork depicting a gamma-ray burst with a beam of material racing away. (syfy.com)
What is a Gamma Ray Burst? (aavso.org)

Gamma energy spectra emitted from iron sphere with D-T neutro. (iaea.org)
The leakage gamma-ray energy spectra are measured with BC-501A spectrometer. (iaea.org)
The energy range of measured gamma-ray spectra is 0.5-5 MeV. (iaea.org)
The gamma-ray energy spectra are resolved by Compton-recoil electron method. (iaea.org)
From the analysis of gamma-ray spectrum, it is found that the iron shell's thickness has some effect on the change of spectra. (iaea.org)

The HAWC observatory was designed to detect and characterize the sources of high-energy gamma-rays in the energy range between 100 GeV and 100 TeV [ 2 ] and started full operations in April 2015. (hindawi.com)
Scientists using the H.E.S.S. observatory in Namibia have detected the highest energy gamma rays ever from a dead star called a pulsar. (scitechdaily.com)
The EGRET instrument on the Compton Gamma-Ray Observatory has observed the Galactic Center (GC) region with good coverage at a number of epochs. (dtu.dk)

The Sharps Container Shield for PET is a simple, safe and convenient solution for disposal of syringes that have been contaminated with high-energy radionuclides. (gammagurus.com)
High energy resolution in the entire energy range from 20 keV to multiple MeV and state-of-the-art electronics make it possible to quickly identify complex mixtures of gamma emitting radionuclides. (zievert.com)

higher-energy gamma rays can only survive if they are produced inside of our galaxy, or in a near neighbor. (astronomy.com)

Sophisticated new instruments and data analysis methods can further expand the frontier of gamma-ray blazar science. (columbia.edu)
As shown by the graphs at left in this illustration, the more distant the blazar, the fewer high-energy gamma rays we can detect. (ifae.es)
After the identification of the gamma-ray blazar TXS 0506+056 as the first compelling IceCube neutrino source candidate, we perform a systematic analysis of all high-energy neutrino events satisfying the IceCube realtime trigger criteria. (psu.edu)
We find one additional known gamma-ray source, the blazar GB6 J1040+0617, in spatial coincidence with a neutrino in this sample. (psu.edu)

The data revealed no significant signal, so upper limits (at 90% C.L.) on the normalization constant were set: 0.05(0.5)TeV-1m-2s-1 for γ=-1.47 (-2) in the gamma flux and 0.4(6.1)TeV-1m-2s-1 for γ=-1.47 (-2) in the high-energy neutrino flux. (psu.edu)

This creates a shock wave that blasts through the outer layers of the star, giving them so much energy they explode away in a supernova . (syfy.com)

The alpha-gamma transition in an argon radio-frequency discharge has been measured using Langmuir probes and a current-voltage monitor. (ncl.ac.uk)

While the association of GB6 J1040+0617 with the neutrino is consistent with background expectations, the source appears to be a plausible neutrino source candidate based on its energetics and multiwavelength features, namely a bright optical flare and modestly increased gamma-ray activity. (psu.edu)
On 27 December 2004, a giant γ flare from the Soft Gamma-Ray Repeater 1806-20 saturated many satellite gamma-ray detectors, being the brightest transient event ever observed in the Galaxy. (psu.edu)

Is there a current technology to detect and measure the highest energy level? (astronomy.com)
7 ) multiplex approach to detect Spike Δ69-70 and Orf1a Δ3675-3677 deletions as an outcome for distinguishing Alpha, Beta, or Gamma and wild-type or other lineages ( 7 ). (cdc.gov)

The Vela pulsar, located in the Southern sky in the constellation Vela (sail of the ship), is the brightest pulsar in the radio band of the electromagnetic spectrum and the brightest persistent source of cosmic gamma rays in the giga-electronvolts (GeV) range. (scitechdaily.com)

The gamma rays are produced in collisions of fast-moving material inside the jets and when the jets interact with the environment around the star. (nasa.gov)
High energy gamma rays are produced near cosmic-ray sites and can be used to probe cosmic-ray acceleration. (lanl.gov)

So the energy resolution should be inversely proportional to the square-root of the gamma ray energy . (physicsopenlab.org)

These gamma rays, with energy levels 200 times more potent than any previous observations from the Vela pulsar, have prompted researchers to reconsider the mechanisms behind such powerful emissions. (scitechdaily.com)
The opportunities to distinguish between different models by means of future gamma -ray observations of this X-ray binary are also discussed. (worktribe.com)

I will show results on MAGIC analysis on S30218+35 and PKS1441-25, including spectral energy distributions and EBL absorption studies, in a multi-wavelength context. (iac.es)

For the first time, we present a systematic study of the gamma-ray flux, spectral and optical variability, and multiwavelength behavior of GB6 J1040+0617 and compare it to TXS 0506+056. (psu.edu)

A new catalog of the highest-energy blasts provides scientists with fresh insights into how they work. (nasa.gov)
GRB 130427A set the record for the highest-energy individual gamma ray detected by the LAT instrument. (nasa.gov)
Whatever the explanation, next to its other superlatives, the Vela pulsar now officially holds the record as the pulsar with the highest-energy gamma rays discovered to date. (scitechdaily.com)
Physicists have spotted the highest-energy light ever seen. (sciencenews.org)
A map of the galactic plane indicates the highest energy gamma ray sources yet discovered. (lanl.gov)
For an affiliated video about the research, see Newly Discovered Gamma Ray Sources Have the Highest Energy Ever Recorded . (lanl.gov)
what's the highest energy for gamma ray in galprop? (stanford.edu)

Recently, the Galactic Center region has been detected as a multi-TeV gamma-ray emitter, implying proton primaries in the PeV energy range in case of hadronic production mechanism: this detection triggers the search for a PeV cosmic accelerator at the center of our Galaxy. (infn.it)

Cable has 700 MW capacity for exchange of renewable energy, sufficient to meet the annual electricity needs of approx. (groningen-seaports.com)
Coal releases more carbon per energy yield than oil or gas do, and nuclear or renewable energy sources release almost no carbon at all. (realclimate.org)

One of these was HESS ( High-Energy Spectroscopic System ). (syfy.com)
When HESS sees them it can figure out where the original gamma rays came from, and what their energies were. (syfy.com)

Anatomy19

Organisms10

Diseases5

Chemicals and Drugs81

Analytical, Diagnostic and Therapeutic Techniques and Equipment37

Psychiatry and Psychology8

Phenomena and Processes92

Disciplines and Occupations4

Anthropology, Education, Sociology and Social Phenomena2

Technology, Industry, Agriculture10

Information Science7

Health Care16

Radiation28

Electrons12

Particles10

Photons11

Emit gamma rays3

Emission19

Astrophysics4

Fermi-Large Area Telescope2

HAWC Gamma-Ray Observa2

Atmospheric Cherenkov telescopes3

Area Telescope1

Astronomy2

Electron volts4

Extreme energies1

Particle5

Astrophysical6

GRBs8

Cosmic rays5

Telescope3

Telescopes3

Neutrinos4

Blazars3

Pulsed gamma rays1

Universe8

Ultrahigh-energy1

Neutrons1

Trillion1

20191

Observatories2

Burst2

Spectra5

Observatory3

Radionuclides2

Higher-energy gamma rays1

Blazar4

Neutrino flux1

Supernova1

Alpha-gamma1

Flare2

Detect2

Source of cosmic1

Rays are produced2

Inversely1

Observations2

Absorption1

Variability1

Highest-energy7

Proton1

Renewable Energy2

HESS2