| 释义 |
nuclear fission
[f. nuclear a. + fission.]
1. Biol. The division of a cell nucleus (cf. fission 2).
1889Jrnl. R. Microsc. Soc. 728 (heading) Phenomena of indirect nuclear fission in inverting epithelia. 1960L. Picken Organization of Cells vii. 295 The formation of a secondary [myotube] is prepared by nuclear fission, leading to the formation of a second linear series of nuclei.
2. Nuclear Sci. = fission 4.
1939Physical Rev. LV. 418/2 As pointed out by Meitner and Frisch, the recent discovery..of the appearance of a radioactive barium isotope as the product of such transmutations offers evidence of a new type of nuclear reaction in which the nucleus divides into two nuclei of smaller charges and masses with release of an energy of more than a hundred million electron volts. The direct proof of the occurrence of this so-called nuclear fission was given by Frisch. 1945H. D. Smyth Gen. Acct. Devel. Atomic Energy Mil. Purposes i. 1 Such a conversion is observed in the phenomenon of nuclear fission of uranium. 1958J. Betjeman Coll. Poems 230 Where Hodge sits down beside his wife And talks of Marx and nuclear fission With all a rustic's intuition. 1958Listener 19 June 1005/1 Reactors operating by nuclear fission. 1971Sci. Amer. June 24/3 Nuclear-fusion fuels such as deuterium and tritium liberate more energy per nucleon (neutron or proton) than nuclear-fission fuels. Unfortunately these hydrogen isotopes only burn efficiently at high temperature. |