| 单词 | deuteron |
| 例句 | On a bracing afternoon, he escorted Weaver into the Radiation Laboratory and showed him the twenty-seven-inch cyclotron, not skimping on the vaudeville of the lavender deuteron beam shooting into the air. Big Science 2015-07-07T00:00:00Z What he had witnessed was the harvesting of the twenty-seven-inch cyclotron’s copious output of deuterons and neutrons. Big Science 2015-07-07T00:00:00Z Their carbon preparation was a paint-like graphite suspension known as Aquadag, which they smeared onto probes for insertion into the cyclotron tank to be bathed in the deuteron beam for days at a time. Big Science 2015-07-07T00:00:00Z They had bombarded dozens of elements with deuterons and assiduously tracked emissions of alpha particles during the bombardments; but the continued emission of electrons or positrons after the bombardments ended had escaped their notice. Big Science 2015-07-07T00:00:00Z In this case, he reckoned, one could obtain the required profusion of neutrons by bombarding an appropriate target with a high-energy deuteron beam. Big Science 2015-07-07T00:00:00Z The cylinder was placed between the magnet poles and nestled right up against the beryllium target that produced neutrons when struck by deuterons. Big Science 2015-07-07T00:00:00Z On June 7 came another milestone, a 17-million-volt deuteron beam slicing through the air for a distance of five feet. Big Science 2015-07-07T00:00:00Z Ernest presided happily over all this activity without bothering himself too much about the experimental results, notwithstanding the lesson of the deuteron fiasco. Big Science 2015-07-07T00:00:00Z Within months, the deuteron fiasco would be forgotten, and universities across the nation and in Europe and Asia would be clamoring for their own machines. Big Science 2015-07-07T00:00:00Z “As soon as we used deuterons,” Livingston recalled, “we got enormous yields of reactions that had never been seen before.” Big Science 2015-07-07T00:00:00Z The giant metal “drift tubes” suspended inside the cylinder, which the deuteron beam would traverse, each weighed several tons. Big Science 2015-07-07T00:00:00Z It was sodium-24, produced by the bombardment of ordinary rock salt by deuterons. Big Science 2015-07-07T00:00:00Z In 1935 the dominant lab in this category had been the Cavendish, which specialized in reactions induced by alpha rays and protons; Berkeley could only compete in research on deuterons. Big Science 2015-07-07T00:00:00Z Livingston and Henderson rewired the switch and trained the deuteron beam on a carbon target for a quarter of an hour. Big Science 2015-07-07T00:00:00Z They expected to find that the disintegration yield rose in a curve consonant with increases in the energy of the bombarding deuterons. Big Science 2015-07-07T00:00:00Z As it happened, the Joliots’ discovery of artificial radioactivity came at the moment when Lawrence was fighting his final rearguard action in defense of his deuteron theory. Big Science 2015-07-07T00:00:00Z An imaginative experimentalist who had been skeptical of Lawrence’s deuteron theory, Kurie proposed to Cooksey that they goad Yale into building a cyclotron to rival Berkeley’s—and to do better work. Big Science 2015-07-07T00:00:00Z The parts had spent their working lives under bombardment by deuterons. Big Science 2015-07-07T00:00:00Z The Joliots had hypothesized that the same radioactivity they had induced in boron with alpha particles would be produced by deuterons acting on carbon. Big Science 2015-07-07T00:00:00Z In the lab, Wu and Shaknov used it to bombard a sheet of copper with deuterons, generating an unstable isotope, Cu 64, as a source of positrons—the antimatter. The Little-Known Origin Story behind the 2022 Nobel Prize in Physics 2023-03-16T04:00:00Z 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 To make the deuteron and hydrogen ion orbit under the same conditions, Myers and Fink kept the two in the same electromagnetic trap for weeks at a time. Particle drag race leads to most precise estimate yet of the proton’s mass 2021-11-30T05:00:00Z From these image currents, the orbital frequency of the deuteron is determined, which scales inversely with its mass. Precise measurement of deuteron mass raises hopes of solving the nuclear-mass puzzle 2020-09-01T04:00:00Z H-bombs fuse together tiny hydrogen nuclei known as deuterons and tritons to create helium nuclei, along with the most powerful explosions in the human arsenal. The Subatomic Discovery That Physicists Considered Keeping Secret 2017-11-06T05:00:00Z Plan view of the cyclotron, showing the method for obtaining an external beam of protons, deuterons, or alpha particles. LRL Accelerators The 184-Inch Synchrocyclotron Then the deuteron captures another proton to form a helium isotope and emits a gamma-ray photon. Readers Respond to the October 2021 Issue 2022-02-20T05:00:00Z Using some theoretical results enabled them to determine the deuteron to proton mass ratio to 4.5 parts per trillion, they report in a paper in press at Physical Review Letters. Particle drag race leads to most precise estimate yet of the proton’s mass 2021-11-30T05:00:00Z Next, the deuteron is replaced with a carbon nucleus, the orbital frequency of which is also measured. Precise measurement of deuteron mass raises hopes of solving the nuclear-mass puzzle 2020-09-01T04:00:00Z Element 43 was "made" for the first time as a result of bombarding molybdenum with deuterons in the Berkeley cyclotron. A Brief History of Element Discovery, Synthesis, and Analysis Some experiments require an external beam of protons, deuterons, or alpha particles. LRL Accelerators The 184-Inch Synchrocyclotron The deuteron is a bound state of a proton and a neutron, and the binding comes from the strong force, which is carried by gluons. Readers Respond to the October 2021 Issue 2022-02-20T05:00:00Z Ultraprecise measurements of the proton and deuteron masses can be used to predict the quantum states of a molecule made of a deuteron and a hydrogen atom, which can be probed by lasers. Particle drag race leads to most precise estimate yet of the proton’s mass 2021-11-30T05:00:00Z The deuteron mass, md, is then found in atomic mass units, where one atomic mass unit is defined as one-twelfth the mass of the carbon atom. Precise measurement of deuteron mass raises hopes of solving the nuclear-mass puzzle 2020-09-01T04:00:00Z "Balancing these babies so that they work properly is hard enough for a deuteron accelerator, but the Monster here is ten times as touchy." Psichopath Writing in Nature, Rau et al.1 report an astonishingly precise measurement of the mass of the deuteron — the nucleus of a hydrogen isotope called deuterium. Precise measurement of deuteron mass raises hopes of solving the nuclear-mass puzzle 2020-09-01T04:00:00Z Figure 1 | The importance of nuclear masses for physics research. a, The rotating molecule HD+ comprises a deuteron — the nucleus of a hydrogen isotope called deuterium — and a proton. Precise measurement of deuteron mass raises hopes of solving the nuclear-mass puzzle 2020-09-01T04:00:00Z The rotational and vibrational frequencies of HD+ reflect the deuteron and proton masses, as well as fundamental laws of physics7,8. Precise measurement of deuteron mass raises hopes of solving the nuclear-mass puzzle 2020-09-01T04:00:00Z |
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