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.