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माना कि हम `._(26)^(56)Fe` नाभिक के दो समान अवयवों `._(13)^(28)Al` में विखंडन पर विचार करें। क्या ऊर्जा की दृष्‍टि से यह विखंडन सम्भव है? `m(._(26)^(56)Fe)=55.93494u` और `m(._(13)^(28)Al)=27.98191u`

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क्षय प्रक्रिया हेतु दी गयी समीकरण
`._(26)^(56)Feto2._(13)^(28)Al`
द्रव्यमान क्षति `(Deltam)=m(._(26)^(56)Fe)-2m(._(13)^(28)Al)`
`=55.93494-2(27.98191)`
`=-0.02888u`
`Q=Deltamxx931=-26.88728MeV`
चूंकि ऊर्जा ऋणातमक है अतः विखण्डन प्रभावशाली रूप से नहीं होगा।

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