| 单词 | nuclear isomer |
| 释义 | > as lemmasnuclear isomer 2. Physics. A nucleus having the same atomic number and mass number but different radioactive properties, as a result of being in a different, long-lived, energy state from which a transition is inhibited; esp. one in a metastable excited state rather than the ground state. Also called nuclear isomer. ΘΚΠ the world > matter > physics > atomic nucleus > radioactive isotope > radioactive nuclide > [noun] > nuclear isomer isomer1934 1934 Physical Rev. 45 729/2 The introduction of isomers may be of help for the removal of existing contradictions in the estimation of neutronic mass from different nuclear reactions. 1950 S. Glasstone Sourcebk. Atomic Energy x. 278/1 The second class consists of genetically related isomers,..in which the metastable state decays to the ground state with a definite half life. 1955 R. D. Evans Atomic Nucleus iii. 97 Isobaric isotopes with distinguishable nuclear properties are called isomers. 1968 F. B. Morinigo tr. H. von Buttlar Nucl. Physics xiv. 478 If the half-life is larger than 1 msec, the state is called a nuclear isomer (the choice of 1 msec for this definition is arbitrary). nuclear isomer nuclear isomer n. Physics = isomer n. 2. ΚΠ 1950 S. Glasstone Sourcebk. Atomic Energy x. 276/1 The phenomenon of decay by isomeric transition, that is, by the spontaneous conversion of one nuclear isomer into another, has been elucidated. 1968 F. B. Morinigo tr. H. von Buttlar Nucl. Physics xiv. 478 If the half-life is larger than 1 msec, the state is called a nuclear isomer (the choice of 1 msec for this definition is arbitrary). 1990 Philos. Trans. (Royal Soc.) A. 332 216 There could even be practical applications, based on the non mass dependent isotope effect arising even for nuclear isomers of almost equal mass. < as lemmas |
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