21. Which of the following reactions violates lepton number conservation?
22. Fission fragments are generally radioactive as
23. In the nuclear shell model the spin parity of 15N is given by
24. The disintegration energy is defined to be the difference in the rest energy between the initial and final states. Consider the following process: $${}_{94}^{240}{\text{Pu}} \to {}_{92}^{236}{\text{U}} + {}_2^4{\text{He}}$$
The emitted α-particle has a kinetic energy 5.17 MeV. The value of the disintegration energy is
The emitted α-particle has a kinetic energy 5.17 MeV. The value of the disintegration energy is