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In a nuclear reaction, alpha+"(7)N^(14)t...

In a nuclear reaction, `alpha+"_(7)N^(14)toX+p`
When nitrogen atoms are bombarded by `7.7 Me V alpha-` particles, protons are ejected with a kinetic energy of `5.5 MeV`. The `Q-` value of the reaction is `-1.26 MeV`
(`a`) Find the atomic mass of `X` in amu, identify the element `X`.
(`b`) Find the angle `phi` between the direction of motion of proton and `alpha-` particle.
Given the atomic mass of `"_(1)H^(1)=1.00814 a.m.u.`,
atomic mass of `"_(7)N^(14)=14.00752 amu`, and atomic mass of `"_(2)He^(4)=4.0038 a.m.u.`

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