| 单词 | spallation product |
| 释义 | > as lemmasspallation product 1. Nuclear Physics. The detachment of a number of nucleons or small nuclei from a larger nucleus, esp. as a result of the impact of an energetic nucleon or other particle. Frequently attributive, as spallation product. ΘΚΠ the world > matter > physics > atomic nucleus > [noun] > detachment from larger nucleus spallation1948 1948 R. E. Lapp & H. L. Andrews Nucl. Radiation Physics xiii. 305 When a high-energy neutron strikes a target nucleus, a reaction known as spallation may occur. 1950 S. Glasstone Sourcebk. Atomic Energy x. 259/2 They do not undergo fission and break up into two, more or less equal, parts. Instead, such nuclei emit various numbers..of nucleons, leaving a series of products of lower mass and atomic number. The name spallation has been proposed for reactions of this kind. [Note] This term is based on the verb ‘to spall’, meaning to break up by chipping off small fragments, which was suggested as appropriate by W. H. Sullivan. 1953 Ann. Rev. Nuclear Sci. 2 401 O'Connor & Seaborg..bombarded uranium with 380-Mev α-particles and then analyzed radiochemically for spallation and fission products. 1962 B. G. Harvey Introd. Nucl. Physics & Chem. ix. 183 Reactions in which several particles are emitted are often called ‘spallation’, regardless of the mechanism by which they take place. 1979 Nature 15 Feb. 519/1 18C can be produced fairly readily in heavy ion collisions, or as a spallation product of heavy nuclei. < as lemmas |
| 随便看 |
|
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。