Question 15.7: Calculate the mass of the excited 60 28 Ni nucleus produced ...
Calculate the mass of the excited ^{60}_{ 28}N i nucleus produced in the β-decay process shown in Fig. 15.9.
As can be seen in Fig. 15.9, the energy of the excited state of ^{60}_{ 28}N i produced by the β-decay process lies 2.506 MeV above the ground state. The mass of the excited nucleus thus exceeds the mass of the unexcited nucleus by
\Delta m = \frac{2.506 MeV}{931.5 MeV/u} = 0.002690 u.The mass of the excited nucleus is thus
m = 59.930791 u + 0.002690 u = 59.933481 u.
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