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Write symbolically the nuclear `beta^(+)` decay process of `._6C^(11)`. Is the decayed product X an isotope or isobar of `._6C^(11)`? Given the mass values of `(._6C^(11)) =11.011434u`
and `m(X)=11.009305 u`. Estimate the Q value in the process.

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`._6C^(11)to._5X^(11)+._(+1)e^0 (i.e., beta^(+))+Q`
Clearly, `._5X^(11)` is an isobar of `._6C^(11)`.
Mass defect, `Deltam=11.011434-(11.009305+0.000545)`
`=0.001584 u`
Q value of reaction `=0.001548xx931MeV`
`=1.4747MeV`

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