0
votes
0answers
29 views

Computing the Ideal Rotational Ratio of B(E2;2+ to 0)/[Q(2)]^2

Although the title is fairly specific, I was wondering how the following is computed by assuming ideal collective nuclear rotation: $$ \frac{B(E2;2^+_1 \to 0^+_1)}{[Q(2^+)]^2}\approx .244 $$ I'm, ...
4
votes
1answer
209 views

Why is the Wick contraction in HFB or BCS equal to a single-particle density?

I'm trying to understand how in Hartree-Fock-Bogoliubov (HFB) or BCS theory we can write a product of creation/annihilation operators as single-particle densities under the guise of "Wick's theorem". ...