A series of drums on the device were set according to the material being crossed and a random choice between fast and slow neutrons.

Its (fission) nuclear cross section for slow thermal neutrons is about 504.81 barns.

This is because U-238 absorbs slow neutrons and forms a new isotope U-239.

We catch a few slow neutrons now and then, and I wouldn't be able to sleep nights.

We do not permit certain experiments out here because of the slow neutrons that sort of wander through here at fair density.

This would lead shortly to his famous work with activation of nuclei with slow neutrons.

Only slow neutrons were involved and the individual nuclear breakdowns were far more energetic than anything else that had yet been discovered.

This is because U-238 absorbs slow neutrons, so forming a new isotope U-239.

This lead to the discovery of slow neutrons, nuclear fission and making elements that were not in the Periodic Table.

Upon irradiation with slow neutrons in a nuclear reactor, several radionuclides of xenon are produced.