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where fis the number of isotopes in a natural element. For negative Q value, Q_(ENDF) gives the threshold energy of this threshold reaction channel. But this ill-defined values can not be relied on energy balance. As pointed in Ref.[2] the reasonable Q value of each reaction channel must be abundance and cross section dependent for natural element. So it is also incident energy dependent. It reads
Where fis the number of isotopes in a natural element. For negative Q value, Q_ (ENDF) gives the threshold energy of this threshold reaction channel. But this ill-defined values can not be relied on energy balance. 2] the reasonable Q value of each reaction channel must be abundance and cross section dependent for natural element. It reads