Q-value from mass defect: Q = (Σm_i − Σm_f)·c²

Layer 1 — Physicsin the nuclear-reactions subtree

The Q-value of a nuclear reaction a + X → Y + b + … is the energy released (Q > 0) or required (Q < 0) in the transformation, equal to c² times the mass defect Q = (m_a + m_X − m_Y − m_b − …)·c². Conservation of energy requires that the…

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