单词 | superthermal source |
释义 | superthermal source [¦sü·pǝr`thǝr·mǝl `sȯrs] NUCLEONICS A source of ultracold neutrons consisting of a container of liquid helium, cooled to about 1 K or less, which has walls that are good reflectors of ultracold neutrons but are transparent to electrons with energies of about 1 millielectronvolt, and which is placed in a beam of such electrons. |
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