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Q值是原子核物理學及核化學中的名詞,核反應的Q值是指核反應所產生的能量:
Q值為正的核反應是放熱反應,Q值為負的核反應是吸熱反應[1]
Q值也用在粒子物理學中,例如薩晉定律(Sargent's rule)中提到弱相互作用的反應速度和Q值的五次方成正比。Q值是靜止的粒子衰變時產生的動能,例如中子的衰變:[2]
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