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单词 neutron
释义
neutron

Physics
  • A neutral hadron (see elementary particles) that is stable in the atomic nucleus but decays into a proton, an electron, and an antineutrino with a mean life of 12 minutes outside the nucleus. Its rest mass (symbol mn) is slightly greater than that of the proton, being 1.674 9286(10)×10−27 kg. Neutrons occur in all atomic nuclei except normal hydrogen. The neutron was first reported in 1932 by James Chadwick.

    https://www.nature.com/physics/looking-back/chadwick/index.html Chadwick’s 1932 letter to Nature on the discovery of the neutron

    http://rspa.royalsocietypublishing.org/content/royprsa/136/830/692.full.pdf Chadwick’s 1932 paper in Proceedings of the Royal Society


Astronomy
  • A subatomic particle that is present in the nuclei of all atoms except the lightest isotope of hydrogen. It has a slightly greater mass than the proton and zero charge. Neutrons are stable in the atomic nucleus, but outside it they undergo beta decay to produce a proton, an electron, and an antineutrino. Neutrons are hadrons.


Chemistry
  • A neutral hadron that is stable in the atomic nucleus but decays into a proton, an electron, and an antineutrino with a mean life of 12 minutes outside the nucleus. Its rest mass is slightly greater than that of the proton, being 1.674 9286(10)×10−27 kg. Neutrons occur in all atomic nuclei except normal hydrogen. The neutron was first reported in 1932 by the British physicist James Chadwick (1891–1974). The quantum-mechanical wave properties of neutrons have been used to investigate several aspects of quantum mechanics.


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