... 跃迁矩 transition moment 过渡核 transition nucleus 一级相变 transition of the first order ...
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Calculations suggest, for instance, that in the nucleus of the isotope thorium-229 is a transition that should emit ultraviolet rays.
举例来说，计算表明，钍- 229的原子核内存在着能发出紫外线的转变过程。
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