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level: Level 1 of Nuclear Physics

Questions and Answers List

level questions: Level 1 of Nuclear Physics

QuestionAnswer
Parity and angular momentum in even-even nucleiParity = +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 numbersAtomic 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 lifePractically, 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