The isotope of uranium with mass number235, fissionable with slow neutrons.
锕铀铀的同位素，原子质量数为235，与慢。
That work, by a group of researchers at the Institut Laue-Langevin (ILL) and published in a paper in Nature, used slow-moving neutrons falling due to gravity.
这项工作，是劳厄·郎之万研究所(ILL)的研究团队完成的，结果发表在《自然》期刊上，证明过程运用了慢速中子在引力下的掉落现象。
Page says that if researchers keep watching Cas A for a few decades, they should see the cooling slow down as all the neutrons pair up and extra neutrino emissions fade.
Page说如果研究人员们继续观测Cas A数十年，他们将看到随着所有中子都成对和额外中微子发射的减少，冷却将减慢。
And that you can appropriately slow down the neutrons by scattering them with an appropriate moderator such that they're not lost or absorbed.
你能够正确地减慢中子，通过将它们散射，用一个恰当的，慢化剂，这样它们就不会损耗或者被吸收。
This nucleus has captured the slow-moving neutrons;
这核子已经俘获慢运动的中子；
This nucleus has captured the slow-moving neutrons;
这核子已经俘获慢运动的中子；
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