| 单词 | antiparticle |
| 例句 | But Cronin and Fitch showed that if one replaces particles by antiparticles and takes the mirror image, but does not reverse the direction of time, then the universe does not behave the same. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z If, instead, it were the particle member of the virtual pair that fell into the hole, one could regard it as an antiparticle traveling back in time and coming out of the black hole. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z The reason is that the laws of physics are not quite the same for particles and antiparticles. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z The trouble is, as explained in Chapter 7, that the uncertainty principle means that even “empty” space is filled with pairs of virtual particles and antiparticles. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z It is therefore possible, if a black hole is present, for the virtual particle with negative energy to fall into the black hole and become a real particle or antiparticle. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z That is, the universe would develop in the same way as its mirror image if, in addition, every particle was swapped with its antiparticle! A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z Because energy cannot be created out of nothing, one of the partners in a particle/antiparticle pair will have positive energy, and the other partner negative energy. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z When it gets to the point at which the virtual particle/antiparticle pair appeared together, it is scattered by the gravitational field into a particle traveling forward in time and escaping from the black hole. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z As has been discussed in this chapter and Chapter 7, “empty” space is filled with pairs of virtual particles and antiparticles that appear together, move apart, and then come back together and annihilate each other. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z In other words, the universe would have to behave the same if one replaced particles by antiparticles, took the mirror image, and also reversed the direction of time. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z The question of why there seem to be so many more particles than antiparticles around us is extremely important, and I shall return to it later in the chapter. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z The virtual particle/antiparticle pairs of spin Vi and Vi would have negative energy, and so would tend to cancel out the positive energy of the spin 2, 1, and 0 virtual pairs. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z It was also found that the weak force did not obey the symmetry C. That is, it would cause a universe composed of antiparticles to behave differently from our universe. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z We now know that every particle has an antiparticle, with which it can annihilate. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z At lower temperatures, however, when colliding particles have less energy, particle/antiparticle pairs would be produced less quickly—and annihilation would become faster than production. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z The answer is that, in quantum theory, particles can be created out of energy in the form of particle/antiparticle pairs. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z Positron, the antiparticle of electron, has the same mass and charge as that of an electron but with the sign flipped for the charge. Ionic crystal generates molecular ions upon positron irradiation, finds new study 2023-10-10T04:00:00Z They range from nanosized crystals to defects in diamond to particles that are their own antiparticles. What’s a Qubit? 3 Ways Scientists Build Quantum Computers 2023-09-28T04:00:00Z Physicists know that for every fundamental particle in nature there is an antiparticle — an evil twin of identical mass but endowed with equal and opposite characteristics like charge and spin. Nothing’s the Matter With Antimatter, New Experiment Confirms 2023-09-27T04:00:00Z If neutrinoless double beta decay is ever observed it would indicate that the neutrino is its own antiparticle, unlike any other fundamental particle that has mass. China’s new underground lab could answer long-standing neutrino mystery 2023-08-22T04:00:00Z If dark matter particles are also their own antiparticles, as many dark matter theories posit, then within these collapsing clouds, those particles would have collided with each other and self-annihilated. JWST Might Have Spotted the First Dark Matter Stars 2023-07-20T04:00:00Z "The stability and binding properties of positronic compounds provide unique perspectives on the interaction of antiparticles with ordinary substances, paving the way for novel investigations in the field of quantum chemistry," remarks Dr. Tachibana. Ionic crystal generates molecular ions upon positron irradiation, finds new study 2023-10-10T04:00:00Z Hawking wanted to know what would happen to pairs of particles—a particle and its antiparticle partner—that spontaneously appeared at a black hole’s event horizon. This Is The Way The Universe Ends: By Evaporating 2023-06-22T04:00:00Z In science fiction, antiparticles provide the power for warp drives. Nothing’s the Matter With Antimatter, New Experiment Confirms 2023-09-27T04:00:00Z If a neutrino does turn out to be its own antiparticle, it could allow us to understand why the universe is made of mostly matter and not antimatter. The Weirdest Particles in the Universe 2023-06-07T04:00:00Z Electrically charged particles have to emerge paired with their antiparticle matches. How Much Does ‘Nothing’ Weigh? 2023-04-29T04:00:00Z The most frequent decay pattern produced another type of meson, called a kaon, plus pairs of particles and their antiparticles—either an electron and a positron or a muon and an antimuon. Hint of Crack in Standard Model Vanishes in LHC Data 2022-12-22T05:00:00Z As soon as a particle meets up with its antiparticle, they destroy each other in a fraction of a second, and the universe at large doesn’t notice their presence. This Is The Way The Universe Ends: By Evaporating 2023-06-22T04:00:00Z Some physicists have speculated that antiparticles are being repelled by gravity or even traveling backward in time. Nothing’s the Matter With Antimatter, New Experiment Confirms 2023-09-27T04:00:00Z My favorite mystery is the determination of whether or not it’s its own antiparticle. The Weirdest Particles in the Universe 2023-06-07T04:00:00Z The lower of the ∓ or ± symbols are the values for antiparticles. College Physics for AP Courses 2015-08-12T00:00:00Z If the particle carries a charge, its antiparticle has the opposite charge. Astronomy 2016-10-13T00:00:00Z This effect describes how charged particles and antiparticles get torn apart when they emerge from the vacuum in the presence of a powerful electromagnetic field. This Is The Way The Universe Ends: By Evaporating 2023-06-22T04:00:00Z In the first step of this fusion process, two protons inside the sun fuse into a deuteron while giving off a neutrino and a positron—the antiparticle of the electron. Readers Respond to the October 2021 Issue 2022-02-20T05:00:00Z Physicists do this by monitoring one of the decay particles they create: electrons, from decays of negatively charged muons, or positrons—the antiparticle version of electrons—from decays of positively charged muons. Weird Muons May Point to New Particles and Forces of Nature 2021-09-14T04:00:00Z These two mesons are different mixtures, but each is its own antiparticle, as indicated by its quark composition. College Physics for AP Courses 2015-08-12T00:00:00Z The remarkable thing about such antimatter is that when a particle comes into contact with its antiparticle, the original particles are annihilated, and substantial amounts of energy in the form of photons are produced. Astronomy 2016-10-13T00:00:00Z In the absence of any external forces, electromagnetic or gravitational, the clouds of both the particle and antiparticle will overlap, and they will annihilate each other. This Is The Way The Universe Ends: By Evaporating 2023-06-22T04:00:00Z When a matter particle meets its antiparticle, they "annihilate" - disappear in a flash of energy. Biggest cosmic mystery 'step closer' to solution 2020-04-16T04:00:00Z An incredibly precise analysis of antihydrogen provides fresh evidence that it’s not because the physics of particles and their antiparticles are different. Daily briefing: Coronavirus vaccine ready for human clinical trials, says US biotech company 2020-02-24T05:00:00Z These two mesons are different mixtures, but each is its own antiparticle, as indicated by its quark composition. College Physics for AP Courses 2015-08-12T00:00:00Z First, for each kind of particle, there is a corresponding but opposite antiparticle. Astronomy 2016-10-13T00:00:00Z Under CPT symmetry, the physics of particles and their antiparticles is identical. Fundamental symmetry tested using antihydrogen 2020-02-18T05:00:00Z As they travel through the Earth, the particles and antiparticles oscillate between different physical properties known as flavours. Biggest cosmic mystery 'step closer' to solution 2020-04-16T04:00:00Z Various properties of the S-matrix were known—notably analyticity with respect to values of particle momenta, and so-called crossing symmetry associated with exchanging particles and antiparticles. Remembering Murray Gell-Mann 2019-06-06T04:00:00Z These two mesons are different mixtures, but each is its own antiparticle, as indicated by its quark composition. College Physics for AP Courses 2015-08-12T00:00:00Z When a particle and its antiparticle meet, they annihilate each other—disappearing in a burst of light. Why Is There More Matter Than Antimatter? 2019-03-21T04:00:00Z 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 Zhang also continued to develop ideas on other topological states of matter, including ‘Majorana states’, because they mimic the behaviour of elementary particles — first hypothesized by Italian physicist Ettore Majorana — that are their own antiparticles. Renowned pioneer of topological physics dies 2018-12-07T05:00:00Z As a result, the electron becomes indistinguishable from its antiparticle, which in this context is an electron vacancy called a hole. The heat is on for Majorana fermions 2018-07-10T04:00:00Z Every particle in nature has an antimatter counterpart, although some particles, like the photon, are their own antiparticles. College Physics for AP Courses 2015-08-12T00:00:00Z An electron and its antiparticle, a positron, have identical properties except for charge, but the charge of the Majorana particle would be zero. What Are the Limits of Manipulating Nature? 2018-05-25T04:00:00Z He compares this with the notion introduced by British physicist Paul Dirac in the 1920s who argued particles possess antiparticles, and if brought together, a particle and antiparticle can annihilate each other. Quantum Physics May Be Even Spookier Than You Think 2018-05-21T04:00:00Z The theory possesses a kind of mathematical symmetry that requires particles and antiparticles to be mirror opposites. Atoms and antiatoms haven’t crashed Albert Einstein’s theory of relativity—yet 2018-04-04T04:00:00Z Another difficulty will be keeping them for weeks at a time, something so far achieved for no more than a few dozen antiparticles at a time. Physicists plan antimatter’s first outing — in a van 2018-02-19T05:00:00Z Certain neutral particles are their own antiparticle and live correspondingly short lives. College Physics for AP Courses 2015-08-12T00:00:00Z For instance, the antiparticle of the negatively charged electron is the positively charged positron, a particle that makes up the bulk of antimatter striking the top of Earth’s atmosphere from outer space. Through a Gas, Darkly: Scientists Trace the Origins of Earth's Antimatter 2017-11-16T05:00:00Z Measurements of the electron and its antiparticle, the positron, showed their spin magnetic moments to be the same to within 4 parts in 1012. Hans Dehmelt (1922-2017) : Nature : Nature Research 2017-05-16T04:00:00Z Those antiparticles are not Ting's big news, however. Giant space magnet may have trapped antihelium, raising idea of lingering pools of antimatter in the cosmos 2017-04-19T04:00:00Z Physicists have performed the first full simulation of a high-energy physics experiment — the creation of pairs of particles and their antiparticles — on a quantum computer1. Quantum computer makes first high-energy physics simulation 2016-06-21T04:00:00Z Figure 33.13 When a particle encounters its antiparticle, they annihilate, often producing pure energy in the form of photons. College Physics for AP Courses 2015-08-12T00:00:00Z When a particle meets its antiparticle, they annihilate each other, typically releasing energetic photons called gamma rays as a result. Through a Gas, Darkly: Scientists Trace the Origins of Earth's Antimatter 2017-11-16T05:00:00Z The forsaken particle or antiparticle may fall into the black hole after its partner, but it may also escape to infinity, where it appears to be radiation emitted by the black hole. Stephen Hawking’s second Reith Lecture: Annotated transcript - BBC News 2016-02-02T05:00:00Z To Ting, those antiparticles may be clues to the unseen "dark matter" that weighs down galaxies with extra gravity, although many astrophysicists regard them as the byproduct of humdrum galactic events. Giant space magnet may have trapped antihelium, raising idea of lingering pools of antimatter in the cosmos 2017-04-19T04:00:00Z “The stronger the field, the faster we can create particles and antiparticles,” Martinez says. Quantum computer makes first high-energy physics simulation 2016-06-21T04:00:00Z Similar annihilations occur for other combinations of a particle with its antiparticle, sometimes producing more particles while obeying all conservation laws. College Physics for AP Courses 2015-08-12T00:00:00Z If the neutrino were its own antiparticle, it would be the only building block of matter with that property—although force-carrying particles like the photon gluon are their own antiparticles. U.S. nuclear physicists push for new neutrino experiment 2015-10-15T04:00:00Z But when a matter particle meets its antiparticle, they disappear in a flash of energy. Neutrinos: 'superheroes' of the particle world - BBC News 2015-10-06T04:00:00Z Other experiments to test whether the neutrino is, weirdly, its own antiparticle may be feasible only if the hierarchy is inverted. U.S. neutrino experiment's first result tantalizes 2015-08-06T04:00:00Z The primary commitment of the LHCb collaboration is the study of particle–antiparticle asymmetries and of rare decays of particles containing b and c quarks. Observation of the rare Bs0 →µ+µ− decay from the combined analysis of CMS and LHCb data : Nature : Nature Publishing Group 2015-05-12T04:00:00Z “Running at higher energy will allow the production of more antiparticles for CERN’s antimatter program – helping physicists to check if the properties of antimatter differ from those of matter,” it said. Restarting the Large Hadron Collider: What Will the Research Mean for Science? 2015-04-08T04:00:00Z In their wisdom, the philosopher-consumers of Television Without Pity also identified the loser edit’s opposite number and antiparticle: the winner edit. The ‘Loser Edit’ That Awaits Us All 2015-03-03T05:00:00Z And that is where things get interesting, for some theories about what dark matter is made of suggest its particles are their own antiparticles. Did dark matter do in the dinosaurs? 2015-02-25T05:00:00Z One finding of modern physics is that every elementary particle on nature’s menu has an evil-twin antiparticle with equal and opposite charge. Val Fitch, Who Discovered Universe to Be Out of Balance, Is Dead at 91 2015-02-10T05:00:00Z However, the B0 and particles are known to oscillate, that is to transform continuously into their antiparticles and vice versa. Observation of the rare Bs0 →µ+µ− decay from the combined analysis of CMS and LHCb data : Nature : Nature Publishing Group 2015-05-12T04:00:00Z This allows particles, accompanied by their corresponding antiparticles, to emerge from the vacuum of empty space as long as they promptly disappear again. Sounds like the light idea 2014-10-16T04:00:00Z With his holes, Dirac had predicted the existence of antiparticles. Schrodinger’s Rats and The Search for Ultimate Reality [Excerpt] 2014-01-31T15:00:00Z And the reality of a particle’s antimatter evil twin is that while opposites may attract, it’s not always such a good idea for particles and antiparticles to act on those urges. Where Are the Anti-People? [Excerpt] 2013-07-12T16:15:05.140Z It is the antiparticle of the electron, identical but with the opposite charge. Dark matter may be source of exotic space particles, physicist says 2013-04-03T17:38:52Z Therefore, a quantum superposition of particle and antiparticle states propagates in the laboratory before decaying. Observation of the rare Bs0 →µ+µ− decay from the combined analysis of CMS and LHCb data : Nature : Nature Publishing Group 2015-05-12T04:00:00Z But when a particle–antiparticle pair appears just outside a black hole’s event horizon, Hawking realized, one member could fall in before the two recombined, leaving the surviving partner to fly outwards as radiation. Astrophysics: Fire in the hole! 2013-04-03T17:20:23.700Z The charges are carried by the fundamental constituents of matter: six and six , and their antiparticles, together known as . [Article] A Particle Consistent with the Higgs Boson Observed with the ATLAS Detector at the Large Hadron Collider 2012-12-20T21:55:01.327Z For every billion antiparticles that were created, there were a billion and one particles. Where Are the Anti-People? [Excerpt] 2013-07-12T16:15:05.140Z These are interesting because they and their antiparticles exhibit CP-violating tendencies. The arrow of time: Backward ran sentences… 2012-08-30T15:01:37Z This is a hypothetical form of radioactivity, thought to be extremely rare, that would be possible only if the neutrino is its own antiparticle. Gran Sasso: Chamber of physics 2012-05-23T21:50:23.633Z Down at this sub-sub-microscopic level, it is in constant turmoil, with pairs of particles and their corresponding antiparticles continually popping into existence before rapidly recombining and vanishing. Astrophysics: Fire in the hole! 2013-04-03T17:20:23.700Z At this scale, the Heisenberg uncertainty principle allows energy to briefly decay into particles and antiparticles, thereby producing “something” from “nothing.” Much Ado about Nothing 2012-04-27T11:15:00.243Z Dirac’s equation predicted that for every particle like an electron, there was going to be an antiparticle. Where Are the Anti-People? [Excerpt] 2013-07-12T16:15:05.140Z This symmetry, which basically means that interactions should remain unchanged if particles and antiparticles swap places and everything is viewed in a mirror, is known to be violated in only a few, very rare reactions. Particle physics: A matter of detail 2012-04-18T17:20:48.653Z 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 All known fermions — particles with half-integer spin, such as electrons — obey Dirac’s rules, but in 1937 Majorana varied Dirac’s equation to predict a class of particle that is its own antiparticle: the Majorana fermion. A solid case for Majorana fermions 2012-03-07T18:20:20.910Z LBNE, Harris reports, would be able to compare the flavor oscillations of neutrinos to those of their antiparticles. Life after Tevatron: Fermilab Still Kicking Even Though It Is No Longer Top Gun 2012-02-01T15:45:04.357Z There’s nothing special about which particle we choose to call the “antiparticle” and which one is “normal.” Where Are the Anti-People? [Excerpt] 2013-07-12T16:15:05.140Z The antiparticles appear to form a thin belt around Earth, gyrating around Earth's magnetic field lines and bouncing back and forth between the planet's north and south magnetic poles, the team notes. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z When a particle encounters its antiparticle, they "annihilate" each other, disappearing in a high-energy flash of light. Antimatter mystery gains ground 2011-07-01T16:42:56Z Bizarrely, though, neutralinos would be their own antiparticles: when they meet, they destroy each other. Antimatter and dark matter detector travels to space station 2011-05-25T09:00:00Z A major question about neutrinos is whether they are their own antiparticles. Life after Tevatron: Fermilab Still Kicking Even Though It Is No Longer Top Gun 2012-02-01T15:45:04.357Z In the experiment 18 traces of the heavy antiparticles were seen. Anti-Helium Produced 2011-04-25T16:47:00Z In experiments with superconductors, several teams of researchers are searching for so-called Majorana fermions: theoretically predicted particles that are their own antiparticles. [Introduction to Special Issue] Introduction: Happy 100th, Superconductivity! 2011-04-07T18:25:52.647Z Thus from the experimental point of view the question as to the sign of the gravitational mass of antiparticles remains painfully open. Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z When a normal particle meets its antiparticle twin, they annihilate each other in a burst of energy and particle debris. Antimatter and dark matter detector travels to space station 2011-05-25T09:00:00Z The symmetry between particles and antiparticles is woven deep into the foundations of physics. Antimatter: Gotcha! 2010-11-18T11:27:00Z That clearly didn't happen, though: when particles meet their antiparticles, they annihilate each other in a burst of energetic gamma rays. Big News About Small Particles -- and Why it Matters 2010-05-20T15:25:00Z These antiparticles are what we would call the pure state of the atom. Abducted to Oz If a future experiment should demonstrate that antiparticles do have a negative gravitational mass, it will deliver a mortal blow to the entire relativistic theory of gravity by disproving the principle of equivalence. Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z If antiparticles collide with their ordinary counterparts, both disappear in material annihilation. Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z For each particle there should be a corresponding antiparticle with exactly the same mass and lifetime but with an opposite electrical charge. Antimatter: Gotcha! 2010-11-18T11:27:00Z Now, as we observe the ship, I am going to concentrate on this counterpart of the atom that your scientists might refer to as antimatter or antiparticle. Abducted to Oz |
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