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。

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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。

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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。

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Although not fissile itself, Th-232 will absorb slow neutrons to produce uranium-233 (U-233)a, which is fissile (and long-lived).

FORBES: Is Thorium the Biggest Energy Breakthrough Since Fire? Possibly.

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.

BBC: Neutrons could test Newton's gravity and string theory

Professor Egil Lillestol of Bergen University has been pushing thorium for some years now, and thinks that Norway should set the trend in building a prototype accelerator-driven reactor in which a massive particle accelerator converts thorium-232 to uranium-233 by irradiating it with slow (spallation) neutrons generated by the impact of a 1.6 GeV proton beam on a lead target.

FORBES: Thorium Nuclear Power -- A Lesson From Norway