level: Level 1 of Nuclear Physics
Questions and Answers List
level questions: Level 1 of Nuclear Physics
| Question | Answer |
|---|---|
| Parity and angular momentum in even-even nuclei | Parity = +1, as for every nucleon we can find another with the same parity Angular momentum = 0, as nucleons will pair up and give no net total |
| What are magic numbers | Atomic numbers that correspond to completely filled shells, that make elements much more stable (meaning more stable isotopes). These numbers are 2, 8, 20, 28, 50, 82, and 126. |
| Difference between mean lifetime and half life | Practically, a factor of ln(2). Mean lifetime - average time to decay, also the time taken for a sample to decrease by 0.368. Half life - time for half of sample to deay |
| Parity and angular momentum of an even-odd nucleus | (L +/- 1/2)^L |
| Selection rules | |J_p - J_d | <= l <= J_p + J_d and (-1)^l = +/- P_d*P-P for an E/M l transition |