| 单词 | antineutrino |
| 例句 | The neutrinos and antineutrinos, however, would not have annihilated with each other, because these particles interact with themselves and with other particles only very weakly. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z For years it seemed like building a muon collider might be the only way to answer whether neutrinos behave differently than antineutrinos. Particle Physicists Dream of a Muon Collider 2023-08-28T04:00:00Z As the electron antineutrinos travel from the reactors to JUNO, many will oscillate into muon or tau antineutrinos that the detector can’t see. China’s new underground lab could answer long-standing neutrino mystery 2023-08-22T04:00:00Z Also present in this pool of particles were neutrinos, which are very tiny, weakly interacting particles, and antineutrinos, their antimatter counterparts. Helium in Distant Galaxies May Help Explain Why the Universe Exists 2023-07-28T04:00:00Z Electron scattering experiments measure where an electron touches a quark’s charge, and neutrino experiments measure where an antineutrino changes a quark’s flavor. How Big Is a Proton? Neutrinos Weigh In 2023-03-16T04:00:00Z Those hints received unexpected support in 2011 when two groups of theorists calculated that nuclear reactors produced 6% fewer electron neutrinos—actually, electron antineutrinos—than theory predicted. Nuclear reactor mystery solved, with no need for new particles 2023-01-11T05:00:00Z For example, the neutrino and antineutrino beams will inevitably differ slightly, both in intensity and in their energy spectrum. Showdown: Two huge neutrino detectors will vie to probe matter’s origins 2022-09-28T04:00:00Z Some of the surviving electron antineutrinos will slam into a proton in the scintillator, producing an energetic positron that results in a flash of light. China’s new underground lab could answer long-standing neutrino mystery 2023-08-22T04:00:00Z The physics community’s most widely accepted theory on the formation of these nuclei tells us that neutrinos and antineutrinos played a fundamental role in the creation of, in particular, helium nuclei. Helium in Distant Galaxies May Help Explain Why the Universe Exists 2023-07-28T04:00:00Z The electron’s antineutrino ν¯ e , being antimatter, has an electron family number of –1 . College Physics for AP Courses 2015-08-12T00:00:00Z In a reactor’s core, uranium and plutonium nuclei split in a chain reaction, and the antineutrinos come from the radioactive “beta decay” of the lighter nuclei left behind. Nuclear reactor mystery solved, with no need for new particles 2023-01-11T05:00:00Z For example, either neutrinos or antineutrinos will be absorbed more strongly by the matter they traverse on their flight to the detector. Showdown: Two huge neutrino detectors will vie to probe matter’s origins 2022-09-28T04:00:00Z Created in a high energy particle collision, a W quickly decays into either an electron or its heavier cousin, a particle called a muon, and an antineutrino. Mass of rare particle may conflict with ‘standard model,’ signaling new physics 2022-04-06T04:00:00Z First, neutrons and protons converted from one to the other in a series of processes involving neutrinos and antineutrinos. Helium in Distant Galaxies May Help Explain Why the Universe Exists 2023-07-28T04:00:00Z By the laws of symmetry, antineutrinos should behave the same way. Why the Big Bang Produced Something Rather Than Nothing 2020-04-15T04:00:00Z In such decay, a neutron in a nucleus changes into a proton while emitting an electron and an electron antineutrino. Nuclear reactor mystery solved, with no need for new particles 2023-01-11T05:00:00Z Muon and electron antineutrinos can spawn detectable antimuons and antielectrons by striking protons, although with about half the efficiency of the neutrino interactions. Showdown: Two huge neutrino detectors will vie to probe matter’s origins 2022-09-28T04:00:00Z The T2K researchers detected more oscillations in neutrinos than in antineutrinos, suggesting the two do not just act as mirror images of each other but, in fact, behave differently. Antimatter Discovery Reveals Clues about the Universe’s Beginning 2020-04-23T04:00:00Z As theoretical physicists, we can create models to test how the ratio of protons to neutrons depends on the relative number of neutrinos and antineutrinos in the early universe. Helium in Distant Galaxies May Help Explain Why the Universe Exists 2023-07-28T04:00:00Z Or in this case, between muon neutrinos and muon antineutrinos. Why the Big Bang Produced Something Rather Than Nothing 2020-04-15T04:00:00Z To predict the total flux of antineutrinos, physicists had to account for the amounts and decays of myriad different nuclei. Nuclear reactor mystery solved, with no need for new particles 2023-01-11T05:00:00Z When T2K runs with antineutrino beams, such interactions produce either an antimuon or a positron, whose signals parallel those generated by the muons and electrons. Skewed neutrino behavior could help explain matter’s dominion over antimatter 2020-04-15T04:00:00Z Yet more data, and probably future experiments, will be needed to precisely measure just how much neutrinos and antineutrinos differ. Antimatter Discovery Reveals Clues about the Universe’s Beginning 2020-04-23T04:00:00Z Because the nuclei formed during Big Bang Nucleosynthesis can still be observed today, scientists can infer how many neutrinos and antineutrinos were present during the early universe. Helium in Distant Galaxies May Help Explain Why the Universe Exists 2023-07-28T04:00:00Z Asked to summarize the result, Dr. Sánchez, a team spokesman, said, “In relative terms more neutrino muons going to neutrino electrons than antineutrino muons going to antineutrino electrons.” Why the Big Bang Produced Something Rather Than Nothing 2020-04-15T04:00:00Z Rarely, a proton in the oil will absorb an electron antineutrino to turn into a neutron while ejecting a positron—sort of the reverse of beta decay. Nuclear reactor mystery solved, with no need for new particles 2023-01-11T05:00:00Z Muon neutrinos turn into electron neutrinos at a higher rate than muon antineutrinos turn into electron antineutrinos, the 357-strong team reports today in Nature. Skewed neutrino behavior could help explain matter’s dominion over antimatter 2020-04-15T04:00:00Z Physicists think that finding a difference - or asymmetry - in the physical properties of neutrinos and antineutrinos might help us understand why matter is so prevalent compared with antimatter. Biggest cosmic mystery 'step closer' to solution 2020-04-16T04:00:00Z With this new result, my collaborators and I worked backward to find the number of neutrinos and antineutrinos necessary to produce the helium abundance found in the data. Helium in Distant Galaxies May Help Explain Why the Universe Exists 2023-07-28T04:00:00Z In this week’s Nature, researchers — directly following in the footsteps of Cowan and Reines — suggest that differences between neutrinos and antineutrinos might help to explain one of the Universe’s biggest mysteries3. Neutrinos could shed light on why the Universe has so much more matter than antimatter 2020-04-14T04:00:00Z Physicists have a strong suspicion of exactly how they overestimated the flux of antineutrinos originating from uranium-235. Nuclear reactor mystery solved, with no need for new particles 2023-01-11T05:00:00Z Symmetry rules imply that, in a mirror world made of antimatter, the antineutrinos should behave like neutrinos. Matter–antimatter symmetry violated 2020-04-14T04:00:00Z But other neutrinos — and, in particular, the antineutrinos that constitute the bulk of supernova emissions — interact with a proton in an atomic nucleus instead of with an electron. Gigantic Japanese detector prepares to catch neutrinos from supernovae 2019-02-26T05:00:00Z What my team did was essentially the more sophisticated version of that, where our “X” was the number of neutrinos or antineutrinos. Helium in Distant Galaxies May Help Explain Why the Universe Exists 2023-07-28T04:00:00Z The team then ran the same experiment with antineutrinos, and compared the numbers. Neutrinos could shed light on why the Universe has so much more matter than antimatter 2020-04-14T04:00:00Z Two decades later, theorists used those data to infer the spectrum of the antineutrinos that had to emerge along with the electrons. Nuclear reactor mystery solved, with no need for new particles 2023-01-11T05:00:00Z They detected dozens of electron antineutrinos in the beam—too many to be produced over the short distance by the usual oscillation mechanism. Reports of sterile neutrino’s resurrection may be greatly exaggerated 2018-06-04T04:00:00Z Thus, when an antineutrino hits, Super-K will see not one flash but two, a few microseconds apart. Gigantic Japanese detector prepares to catch neutrinos from supernovae 2019-02-26T05:00:00Z The previously accepted theory predicted that there should be the same number of neutrinos and antineutrinos in the early universe. Helium in Distant Galaxies May Help Explain Why the Universe Exists 2023-07-28T04:00:00Z The demonstration will scale up previous work that was able to detect antineutrinos at a distance of about 80 feet from a reactor core. How to Spot a Nuclear Bomb Program? Look for Ghostly Particles 2018-03-27T04:00:00Z And a shortage in the number of antineutrinos arriving at experiments near nuclear reactors looks increasingly likely to be caused by errors in calculating the predicted rate. Rare particle decays offer hope of new physics 2017-06-06T04:00:00Z The latest evidence for sterile neutrinos emerged in 2011, when a team of theorists argued that various experiments that detect electron antineutrinos from nearby nuclear reactors saw fewer antineutrinos than they should. Weird sterile neutrinos may not exist, suggest new data from nuclear reactors 2017-04-06T04:00:00Z In 1998, two years after operations began, the detector provided the first solid evidence that neutrinos and antineutrinos can ‘oscillate’, or cycle, between three flavours. Gigantic Japanese detector prepares to catch neutrinos from supernovae 2019-02-26T05:00:00Z However, when we tweaked this theory to give us a prediction that matched the new data set, we found that the number of neutrinos was greater than the number of antineutrinos. Helium in Distant Galaxies May Help Explain Why the Universe Exists 2023-07-28T04:00:00Z In 1987, several large neutrino detectors detected a few handfuls of neutrinos and antineutrinos from the explosion of a star more than 160,000 light-years away. How to Spot a Nuclear Bomb Program? Look for Ghostly Particles 2018-03-27T04:00:00Z The latest T2K results — which suggest that neutrinos and antineutrinos oscillate between flavours in different ways — hint that the interference between mass states might be different between neutrino matter and antimatter. Morphing neutrinos provide clue to antimatter mystery 2016-08-11T04:00:00Z Dubbed the reactor antineutrino anomaly, that deficit bolstered the case for a sterile neutrino, as it suggested that the antineutrinos were morphing into the undetectable sterile form. Weird sterile neutrinos may not exist, suggest new data from nuclear reactors 2017-04-06T04:00:00Z This will make the detector much better at distinguishing between different types, or ‘flavours’, of neutrino, as well as their antiparticles, antineutrinos. Gigantic Japanese detector prepares to catch neutrinos from supernovae 2019-02-26T05:00:00Z In this study, my collaborators and I proved that this new measurement of helium is consistent with there being more neutrinos then antineutrinos in the early universe. Helium in Distant Galaxies May Help Explain Why the Universe Exists 2023-07-28T04:00:00Z A collaboration of American and British scientists announced on Tuesday that they would build a test antineutrino detector called Watchman in a mine on the northeast coast of England. How to Spot a Nuclear Bomb Program? Look for Ghostly Particles 2018-03-27T04:00:00Z They then repeated the experiment with a beam of muon antineutrinos. Morphing neutrinos provide clue to antimatter mystery 2016-08-11T04:00:00Z Physicists study antineutrinos from the reactor cores, and in 2012 they reported the measurement of a key parameter in the morphing of neutrinos. Weird sterile neutrinos may not exist, suggest new data from nuclear reactors 2017-04-06T04:00:00Z This is the first indication that the presumed asymmetry or imbalance between neutrinos and antineutrinos is actually there. Flavour changing neutrinos give insight into Big Bang - BBC News 2016-07-12T04:00:00Z He and his colleagues at an experiment in China, the Daya Bay Collaboration, found an extraordinary excess of antineutrinos there, in line with two other experiments. Gravitational waves breakthrough shines light on race to find dark matter 2016-02-14T05:00:00Z The INO takes a unique approach — using 50,000 tonnes of magnetized iron to separate atmospheric neutrino observations from their antineutrino counterparts. Nuclear rumours delay India’s bid for neutrino glory 2016-01-12T05:00:00Z Instead, they saw 32 neutrinos and 4 antineutrinos arrive in their detector. Morphing neutrinos provide clue to antimatter mystery 2016-08-11T04:00:00Z To tell a reactor from sources like those, you must be able to tell between neutrinos and antineutrinos. The watcher in the water 2015-05-14T04:00:00Z If neutrinos are not Majorana particles, then perhaps neutrinos oscillate to other flavors at different rates than antineutrinos do. New Experiment Aims to Crack Neutrino Mass Mystery 2014-11-04T05:00:00Z This large mixing implies that fundamental symmetry differences between neutrinos and antineutrinos might be observable in a long-baseline experiment, telling us about matter and antimatter imbalances in the early Universe. Particle physics: Together to the next frontier 2013-12-18T18:50:29.366Z “We’re particularly interested in trying to see if neutrino oscillations are different between neutrinos and antineutrinos,” says Alysia Marino of the University of Colorado, who shared the question with Symmetry. 5 Unanswered Questions that Will Keep Physicists Awake at Night 2013-10-25T14:45:06.740Z In neutrino-less double beta decay, both processes would happen in tandem: The antineutrino produced by the first type of decay would serve as the neutrino that enters into the second. Search Escalates for Key to Why Matter Exists 2013-10-23T11:45:00.563Z Double flashes show the size of the antineutrino flux. The watcher in the water 2015-05-14T04:00:00Z If the mass measurements of these particles were accurate enough, a simple equation would result in the mass of the antineutrino. Readers Respond to "The Low-Cost Ticket to Space" 2013-07-28T16:45:00.550Z The resulting proton beam would then be fired at a carbon and copper target to generate particles called pions, some of which decay into antineutrinos. Cyclotrons come full circle 2013-07-24T17:20:22.913Z Some kinds of nuclei are also known to undergo a much rarer process known as double-beta decay, in which two neutrons convert into two protons simultaneously, simultaneously emitting two electrons and two antineutrinos. Are Neutrinos Their Own Antiparticles? 2013-07-16T22:50:00Z Such a dual reaction can occur only if neutrinos and antineutrinos are one and the same particle, as the Italian physicist Ettore Majorana hypothesized in 1937. Search Escalates for Key to Why Matter Exists 2013-10-23T11:45:00.563Z The physicists observed a similar trend in analogous reactions involving antineutrinos—the particles’ antimatter counterpart. Particle Pals: Neutrino Experiment Shows Protons and Neutrons Pairing Up 2013-06-24T19:15:00.307Z In a report presented last week at CERN, Europe’s particle-physics laboratory near Geneva, Switzerland, the Neutrino Factory was ranked as the best option among three facilities for testing whether neutrinos and antineutrinos behave differently. Seven days: 14–20 June 2013 2013-06-19T17:20:21.887Z It would send beams of neutrinos and antineutrinos along a 1,300-kilometre underground path to a detector in the Homestake mine near Lead, South Dakota. Cyclotrons come full circle 2013-07-24T17:20:22.913Z It's possible to trigger a nuclear reaction much like beta decay in which instead of emitting an antineutrino, a neutron absorbs a neutrino and then turns into a proton and an electron. Are Neutrinos Their Own Antiparticles? 2013-07-16T22:50:00Z These isotopes become even more stable when two of their neutrons simultaneously convert into protons, emitting two electrons and two antineutrinos. Neutrino physics: Beta test 2012-07-11T17:20:34.477Z Neutrinos and antineutrinos come in three flavors—electron, muon and tau—each of them associated with a charged elementary particle of the same name. Particle Pals: Neutrino Experiment Shows Protons and Neutrons Pairing Up 2013-06-24T19:15:00.307Z “We made the world's most precise measurement of antineutrinos' parameters — but everyone wants to be the group that discovers something new.” Particle physics: A matter of detail 2012-04-18T17:20:48.653Z Strictly speaking, the Daya Bay experiment looked at antineutrinos rather than neutrinos. Matter and antimatter: Flavoursome research 2012-03-15T16:00:33Z It also validates experiments that plan to compare the rates of neutrino and antineutrino oscillations, to test the symmetry between matter and antimatter. Seven days: 9?15 March 2012 2012-03-14T18:20:17.293Z For example, the annihilation is possible only if neutrinos and antineutrinos are the same particle. Neutrino physics: Beta test 2012-07-11T17:20:34.477Z Future experiments, Luk says, should be able to investigate that possibility by sending neutrinos and antineutrinos from one lab to another, across hundreds of kilometers, to compare how they oscillate. Flavor of the Ray: Neutrino Measurement May Help Solve Mystery of Matter's Domination over Antimatter 2012-03-08T20:15:12.807Z By comparing oscillations of neutrinos with those of antineutrinos, it might also provide clues about the imbalance of matter and antimatter in the Universe. Seven days: 12?18 August 2011 2011-08-17T17:20:40.867Z Neutrinos and antineutrinos, which travel through mass and space freely due to their lack of charge and other properties, are released by radioactive materials as they decay. Nuclear Fission Confirmed as Source of More than Half of Earth's Heat 2011-07-18T22:45:00.247Z But it raises the prospect that future experiments will be able to test the symmetry between matter and antimatter, by comparing neutrino oscillations with those of antineutrinos. Seven days: 23 June 2011 2011-06-22T17:20:17.267Z So physicists are keen to try to compare the mixing of muon neutrinos and electron neutrinos with the mixing of muon antineutrinos and electron antineutrinos. First Results From Japanese Neutrino Experiment Hint at Big Things to Come 2011-06-15T23:05:34Z That number, known as a mixing angle, describes the probability that an electron neutrino's antiparticle, the electron antineutrino, will oscillate into another flavor over a relatively short distance. Flavor of the Ray: Neutrino Measurement May Help Solve Mystery of Matter's Domination over Antimatter 2012-03-08T20:15:12.807Z Now a refined version of an old calculation is causing a stir by suggesting that researchers have also systematically underestimated the number of the particles' antimatter partners--antineutrinos--produced by nuclear reactor experiments. The Amazing Disappearing Neutrino 2011-04-01T20:45:00.257Z The detector hides from cosmic rays—broadly similar to the neutrinos and antineutrinos it is designed to register—under Mount Ikenoyama nearby. Nuclear Fission Confirmed as Source of More than Half of Earth's Heat 2011-07-18T22:45:00.247Z What about processes involving only neutrinos-say, the emission of a neutrino- antineutrino pair by an excited nucleus? Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z In just two months of data, the distant set of detectors registered more than 10,000 hits by electron antineutrinos. Flavor of the Ray: Neutrino Measurement May Help Solve Mystery of Matter's Domination over Antimatter 2012-03-08T20:15:12.807Z A nonzero theta 13 is good news for physicists hoping to explore the differences between neutrinos and antineutrinos, should any such differences exist. Flavor of the Ray: Neutrino Measurement May Help Solve Mystery of Matter's Domination over Antimatter 2012-03-08T20:15:12.807Z The deficit could be caused by the antineutrinos turning into so-called 'sterile antineutrinos', which can't be directly detected, and which would be clear evidence for effects beyond the standard model of particle physics. The Amazing Disappearing Neutrino 2011-04-01T20:45:00.257Z Schönert says that one key experiment everyone is waiting for is a measurement showing that the rate of disappearance of antineutrinos from a source increases with the distance from it. The Amazing Disappearing Neutrino 2011-04-01T20:45:00.257Z Experiments that measure the rate of antineutrino production from the decay of uranium and plutonium isotopes have so far produced results roughly consistent with this theory. The Amazing Disappearing Neutrino 2011-04-01T20:45:00.257Z This means that several generations of neutrino and antineutrino experiments have unknowingly missed a small fraction of the particles. The Amazing Disappearing Neutrino 2011-04-01T20:45:00.257Z Because the detectors are tuned to identify only electron antineutrinos, any oscillation means that the neutrinos will escape detection—that is, they will seem to disappear. Flavor of the Ray: Neutrino Measurement May Help Solve Mystery of Matter's Domination over Antimatter 2012-03-08T20:15:12.807Z |
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