| 单词 | antiproton |
| 例句 | There are no antiprotons or antineutrons, made up from antiquarks, except for a few that physicists produce in large particle accelerators. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z Thus it is impossible to test A proton and an antiproton collide at high energy, producing a couple of almost free quarks. grand unified theories directly in the laboratory. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z For example, antiprotons have a negative charge while protons have a positive charge. Down goes antimatter! Gravity's effect on matter's elusive twin is revealed 2023-09-27T04:00:00Z The antiprotons and positrons attract, forming neutrally charged atoms of antihydrogen, the antimatter version of hydrogen. What Happens if You Drop Antimatter? New Gravitational Test Sees First Fall 2023-09-27T04:00:00Z First, the team used an electric field to catch antiprotons and antielectrons generated in particle collisions. Antimatter falls down, just like ordinary matter 2023-09-27T04:00:00Z The antiprotons and positrons are then sent into a giant magnet, where they mix to form thousands of atoms of antihydrogen. Scientists get closer to solving mystery of antimatter 2023-09-27T04:00:00Z The antiproton p- is u- u- d , for example. College Physics for AP Courses 2015-08-12T00:00:00Z If the temperature exceeds 1014 K, much more massive protons and antiprotons can be created. Astronomy 2016-10-13T00:00:00Z These included modeling proton and antiproton collisions and conducting a new, more thorough examination of the decommissioned detector’s operational quirks—even using old cosmic-ray data to map its layout down to the micron. Elementary Particle’s Unexpected Heft Stuns Physicists 2022-04-07T04:00:00Z That work resulted in, among other things, the most precise determination so far of the ratio of the mass of the antiproton to that of the electron. Exotic helium atom lit up 2020-05-05T04:00:00Z These antiprotons are produced by colliding particles together in Cern's accelerators. Scientists get closer to solving mystery of antimatter 2023-09-27T04:00:00Z In addition to the large synchrotrons that produce colliding beams of protons and antiprotons, there are other large electron- positron accelerators. College Physics for AP Courses 2015-08-12T00:00:00Z The gaps between energy levels in antihydrogen — the simplest antimatter atom, with one antiproton and one positron — seem to be identical to those measured in ordinary hydrogen. Daily briefing: Coronavirus vaccine ready for human clinical trials, says US biotech company 2020-02-24T05:00:00Z A facility called the Antiproton Decelerator delivers antiprotons to this experiment, with a source of radioactive sodium providing positrons. Fundamental symmetry tested using antihydrogen 2020-02-18T05:00:00Z If antiprotons are held in the strong magnetic field of a device known as a Penning trap, these waves will produce changes in the frequency at which the spins of the antiprotons precess. Link between antimatter and dark matter probed 2019-11-12T05:00:00Z By counting the escaping antiprotons, researchers estimated how many atoms they were exciting. Atoms and antiatoms haven’t crashed Albert Einstein’s theory of relativity—yet 2018-04-04T04:00:00Z It is possible to contain large-scale antimatter particles such as antiprotons by using electromagnetic traps that confine the particles within a magnetic field so that they don't annihilate with other particles. College Physics for AP Courses 2015-08-12T00:00:00Z Because antiprotons annihilate so readily, both with protons and with neutrons, they present a unique way to study the unusual configurations of radioactive nuclei. Physicists plan antimatter’s first outing — in a van 2018-02-19T05:00:00Z For example, a measurement of the Lamb shift with an uncertainty of less than one part in 104 would allow the antiproton charge radius to be determined12. Fundamental symmetry tested using antihydrogen 2020-02-18T05:00:00Z This set-up allows the antiprotons to be measured continuously for long periods of time, and to be shuttled back and forth between different measurement chambers without running into ordinary matter and being annihilated. Link between antimatter and dark matter probed 2019-11-12T05:00:00Z To perform experiments, we load the precision trap with a single antiproton and remove contaminants such as electrons and negatively charged ions with kick-out and high power radio-frequency pulses. A parts-per-billion measurement of the antiproton magnetic moment : Nature : Nature Research 2017-10-17T04:00:00Z It is not currently possible to store a significant quantity of antiprotons. College Physics for AP Courses 2015-08-12T00:00:00Z By observing how often antiprotons annihilate with a proton versus a neutron, the team will be able to understand the relative densities of these particles at the very edge of the nucleus. Physicists plan antimatter’s first outing — in a van 2018-02-19T05:00:00Z The absolute energy scales for the positron and antiproton spin-flip transitions in ALPHA-2 are respectively five and eight orders of magnitude smaller than that of the laser transition that was recently observed15. Observation of the hyperfine spectrum of antihydrogen : Nature : Nature Research 2017-08-01T04:00:00Z One of the main goals of the collaboration is to determine the intrinsic magnetic moment of the antiproton. Link between antimatter and dark matter probed 2019-11-12T05:00:00Z The residual magnetic field inhomogeneity B2,PT changes the magnetic field experienced by the antiprotons depending on their axial amplitudes. A parts-per-billion measurement of the antiproton magnetic moment : Nature : Nature Research 2017-10-17T04:00:00Z A precious few are antiprotons and positrons: the antimatter counterparts of protons and electrons. Giant space magnet may have trapped antihelium, raising idea of lingering pools of antimatter in the cosmos 2017-04-19T04:00:00Z Our antihydrogen measurements are potentially very sensitive to the internal structure of the antiproton, at a level that is relevant to the current study of the proton charge radius25, 26. Observation of the 1S–2S transition in trapped antihydrogen : Nature : Nature Research 2016-12-18T05:00:00Z A giant machine that smashes atoms, it was used to find the antiproton, a discovery that led to a Nobel Prize. The week’s passages 2016-09-23T04:00:00Z The key to their method was the simultaneous measurement of the spin precession and a quantity called the cyclotron frequency, which describes the cyclical motion of an antiproton in a trap. Link between antimatter and dark matter probed 2019-11-12T05:00:00Z Further improvements in the measurement precision of the antiproton magnetic moment using our method are possible. A parts-per-billion measurement of the antiproton magnetic moment : Nature : Nature Research 2017-10-17T04:00:00Z A giant machine that smashes atoms, it was used to find the antiproton, a discovery that led to a Nobel Prize. Edward Lofgren, physicist who built early particle accelerator, dies at 102 2016-09-22T04:00:00Z The two short solenoids are used in capture and preparation of the antiproton and positron plasmas. Observation of the 1S–2S transition in trapped antihydrogen : Nature : Nature Research 2016-12-18T05:00:00Z During this relaxation/randomization phase, electric fields are applied that clear the positrons and antiprotons remaining in the trap. An improved limit on the charge of antihydrogen from stochastic acceleration : Nature : Nature Publishing Group 2016-01-19T05:00:00Z This task was challenging, because it required meticulous control of a device known as a magnetic bottle to non-destructively determine the spin state of the antiproton. Link between antimatter and dark matter probed 2019-11-12T05:00:00Z The analysis trap with its strong superimposed magnetic bottle B2,AT is essential for non-destructively determining the spin state of the antiproton. A parts-per-billion measurement of the antiproton magnetic moment : Nature : Nature Research 2017-10-17T04:00:00Z This means that the phemomenon that made matter into the dominant form of stuff in the universe, probably wasn’t some property of the antiproton interactions, Tang said. Antimatter Protons Stick Together Just Like Normal Particles 2015-11-09T05:00:00Z Trapped antihydrogen is detected by ramping down the currents in the magnetic trap over 1.5 s and detecting the annihilation of the antiproton when the released atoms hit the wall of the trap. Observation of the 1S–2S transition in trapped antihydrogen : Nature : Nature Research 2016-12-18T05:00:00Z In the experiment, we mix positrons and antiprotons for 1 s. An improved limit on the charge of antihydrogen from stochastic acceleration : Nature : Nature Publishing Group 2016-01-19T05:00:00Z The electron gun shown on the right provides particles for the electron cooling of antiprotons. High-precision comparison of the antiproton-to-proton charge-to-mass ratio : Nature : Nature Publishing Group 2015-08-11T04:00:00Z The image charge induced by the antiproton in the trap electrodes interacts back with the particle and modifies cyclotron frequency determined via the invariance theorem. A parts-per-billion measurement of the antiproton magnetic moment : Nature : Nature Research 2017-10-17T04:00:00Z The experiment confirmed that the interactions between antiprotons were the same as those of protons. Antimatter Protons Stick Together Just Like Normal Particles 2015-11-09T05:00:00Z Potential manipulations are carefully controlled to create and maintain temperatures as low as possible for the positrons and antiprotons during mixing. Observation of the 1S–2S transition in trapped antihydrogen : Nature : Nature Research 2016-12-18T05:00:00Z Just as hydrogen is made of a proton and an electron, antihydrogen is an atom made of their antimatter counterparts antiprotons and positrons. Cern closes in on antigravity answer 2013-04-30T17:38:15Z Our measurements are triggered by the antiproton injection into the Antiproton Decelerator; this avoids systematic ratio shifts induced by beats between the measurements and ambient field fluctuations caused by the Antiproton Decelerator cycle. High-precision comparison of the antiproton-to-proton charge-to-mass ratio : Nature : Nature Publishing Group 2015-08-11T04:00:00Z Daedalus' fusion reactions would be sparked by electron beams rather than antiproton beams, however. Antimatter and Fusion Drives Could Power Future Spaceships 2012-09-13T15:45:00.407Z A dark-matter particle from the dark sector — “even darker matter”, quips Arkani-Hamed — would be seen only through a decay involving the force-carrying dark photon, which would make positrons but not antiprotons. Physicists hunt for dark forces 2012-04-04T17:20:36.127Z Background events were collected during times when there was no antiproton beam. Observation of the 1S–2S transition in trapped antihydrogen : Nature : Nature Research 2016-12-18T05:00:00Z It slammed protons and antiprotons together by the trillions at nearly the speed of light to discover some of high-energy physics' greatest hits, including the top quark a host of other new particles. Higgs Boson: Found at Last? 2012-03-08T11:00:00Z The electron gun shown on the right provides particles for the electron cooling of antiprotons. High-precision comparison of the antiproton-to-proton charge-to-mass ratio : Nature : Nature Publishing Group 2015-08-11T04:00:00Z A beam of antiprotons—the antimatter equivalent of protons, sporting a net electrical charge of minus-1 rather than plus-1—would be directed at the pellets. Antimatter and Fusion Drives Could Power Future Spaceships 2012-09-13T15:45:00.407Z The world's most powerful accelerator, it smashes protons and antiprotons together at 1.8 trillion electron volts. "You're the Top..." [From the Archive] 2011-09-29T17:15:03.417Z The two short solenoids are used in capture and preparation of the antiproton and positron plasmas. Observation of the 1S–2S transition in trapped antihydrogen : Nature : Nature Research 2016-12-18T05:00:00Z Underneath a relict patch of illinois prairie, complete with a small herd of grazing buffalo, protons and antiprotons whiz along in opposite paths around a four-mile-long tunnel. Waiting for the Higgs (preview) 2011-09-29T12:15:00.497Z In our measurements we also compare the cyclotron frequencies of a single antiproton and an H− ion. High-precision comparison of the antiproton-to-proton charge-to-mass ratio : Nature : Nature Publishing Group 2015-08-11T04:00:00Z When the antiprotons slammed into uranium nuclei, they would annihilate, generating high-energy fission products that ignite fusion reactions in the fuel. Antimatter and Fusion Drives Could Power Future Spaceships 2012-09-13T15:45:00.407Z The antineutrons escape the atmosphere and then decay into antiprotons at much higher altitudes. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z The antihydrogen production method involves a new technique in which we ‘stack’ anti-atoms resulting from two successive mixing cycles, which originate from independent shots of antiprotons from the antiproton decelerator and accumulations of positrons. Observation of the 1S–2S transition in trapped antihydrogen : Nature : Nature Research 2016-12-18T05:00:00Z The number of antioprotons exceeds, by several orders of magnitude, the amount of antiprotons that would be expected outside of the radiation belts. Antimatter Belt Detected Orbiting the Earth 2011-08-08T02:50:25Z Antiprotons are delivered in bunches by the Antiproton Decelerator of CERN; the antiproton bunches also release hydrogen from our degrader structure. High-precision comparison of the antiproton-to-proton charge-to-mass ratio : Nature : Nature Publishing Group 2015-08-11T04:00:00Z But antiproton production is ticking upward at a fairly fast rate, he added. Antimatter and Fusion Drives Could Power Future Spaceships 2012-09-13T15:45:00.407Z The best concepts for antimatter propulsion require that the antiprotons be collected and isolated. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z ALPHA-2 is equipped with extensive diagnostics for lepton and antiproton plasmas. Observation of the 1S–2S transition in trapped antihydrogen : Nature : Nature Research 2016-12-18T05:00:00Z The team says a small number of antiprotons lie between the Van Allen belts of trapped "normal" matter. Antimatter belt 'surrounds Earth' 2011-08-07T09:54:28Z From this particle cloud we extract a single antiproton and keep it in the centre of the trap, as well as an H− ion, which is parked in the downstream park electrode. High-precision comparison of the antiproton-to-proton charge-to-mass ratio : Nature : Nature Publishing Group 2015-08-11T04:00:00Z Unfortunately hadrons, such as protons and antiprotons, are made of smaller bits called quarks. Looking for the Higgs: Enemy in sight? 2011-07-27T17:30:45Z The number of antiprotons needed, however, would exceed the amount in the newly discovered belt or even the much larger belt that may circle Saturn, Bickford says. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z In the anti-form, the mirror of an electron - a positron - is bound to an antiproton. Science ups the 'anti' on matter 2011-06-06T09:12:12Z The band is "the most abundant source of antiprotons near the Earth", said Alessandro Bruno of the University of Bari, a co-author of the work. Antimatter belt 'surrounds Earth' 2011-08-07T09:54:28Z Once cooled to 4 K, ultralow pressures are reached, and thus antiproton storage lifetimes of more than a year are achieved. High-precision comparison of the antiproton-to-proton charge-to-mass ratio : Nature : Nature Publishing Group 2015-08-11T04:00:00Z When that happens, the positively charged positron and the negatively charged antiproton cancel each other's charges. Antiatoms, All Out of Energy and Ready for Work 2011-06-05T18:00:00Z The belt, which consists of antiprotons trapped by Earth's magnetic field several hundred kilometers above the planet's surface, may ultimately become a key source of fuel for missions venturing beyond the solar system. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z And just as the neutral hydrogen atom is made of a single proton bound to an electron, an atom of antihydrogen comprises an antiproton and a positron, the antimatter counterparts, respectively. Stick Up: Antimatter Atoms Trapped for More Than 15 Minutes 2011-06-05T17:15:00.427Z "Above altitudes of several hundred kilometres, the loss rate is significantly lower, allowing a large supply of antiprotons to be produced." Antimatter belt 'surrounds Earth' 2011-08-07T09:54:28Z It's the fallout from these annihilations, speeding past the ISS in the form of antiprotons, that the new detector might be able to snag. Antimatter and dark matter detector travels to space station 2011-05-25T09:00:00Z His younger brother, Gerson, who died last year, was part of a team at Lawrence Berkeley Laboratory in California that confirmed the antiproton discovery. Maurice Goldhaber, Atomic Physicist, Is Dead at 100 2011-05-18T00:50:46Z Pairs of protons and antiprotons are also directly produced in the cosmic ray collisions with the atmosphere. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z The team was analysing data from collisions between protons and their anti-matter counterparts antiprotons. Accelerator hints at new particle 2011-04-07T17:48:48Z Mr. van der Meer’s advance was finding a way to generate intense beams of a particular particle, antiprotons, that were needed for the experiments. Simon van der Meer, Nobel Laureate, Dies at 85 2011-03-12T02:31:51Z The antiprotons themselves, which are produced by smashing regular protons into a piece of iridium, are around 100 billion times more energetic than this. Antimatter: Gotcha! 2010-11-18T11:27:00Z The team identified 28 antiprotons with kinetic energies between 60 million and 750 million electron volts. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z The antiprotons tend to congregate several hundred kilometers above Earth, where ordinary matter is so scarce that they are unlikely to meet up with their particle counterparts—protons—and destroy each other on contact. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z The belt, which extends from a few hundred to about 2000 kilometers above Earth, "constitutes the most abundant source of antiprotons in Earth's vicinity," Bruno says. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z By slamming antiprotons and protons together, physicists achieved higher-energy collisions that revealed constituents of the universe never before seen. Simon van der Meer, Nobel Laureate, Dies at 85 2011-03-12T02:31:51Z The antiprotons are then pushed into the same trap as the positrons and left to mingle for a second or so. Antimatter: Gotcha! 2010-11-18T11:27:00Z That's why the antiprotons in the belt are nearly a trillion times more valuable than diamonds, he says. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z Saturn may produce the greatest number of antiprotons because of interactions between cosmic rays—energetic charged particles from space—and the planet's icy rings. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z But an antiproton is rare, and it annihilates the moment it touches a proton. Simon van der Meer, Nobel Laureate, Dies at 85 2011-03-12T02:31:51Z For the weak force experiments, physicists needed high-speed collisions between a proton, a particle found in the nucleus of atoms, and its antimatter doppelganger, the antiproton. Simon van der Meer, Nobel Laureate, Dies at 85 2011-03-12T02:31:51Z Particle accelerators can create sprays of antiprotons with high-energy proton collisions, but the antiprotons fly out in different directions with not enough left for the experiments. Simon van der Meer, Nobel Laureate, Dies at 85 2011-03-12T02:31:51Z With stochastic cooling, the spray of antiprotons could be shepherded into a tight beam. Simon van der Meer, Nobel Laureate, Dies at 85 2011-03-12T02:31:51Z At the right moment, the antiprotons would mix with protons and annihilate them to produce highly energetic charged particles to propel the craft. Antimatter Belt Found Circling Earth 2011-08-09T20:55:14Z The beam of antiprotons was then collided with a beam of protons traveling in the opposite direction. Simon van der Meer, Nobel Laureate, Dies at 85 2011-03-12T02:31:51Z |
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