Recent content by kuengb

I see. Thank you!

In Fermi's golden rule for the reaction rate, there is the DOS as a factor, and this is proportional to the number of spin states. I got it from Perkin's book "I. to High Energy Physics". I think I'll quote the questionable paragraph: "So far, we have not considered particle spin. The...

Hello The Breit-Wigner formula says that the cross section for a resonance is proportional to \frac{1}{(2S_a + 1)(2 S_b + 1)}, where Sa and Sb are the spins of the incident particles. What's the reason for this? I don't understand it because for a general cross section there appears just...

Thank you! That's exactly what I've looked for.

Hello everybody Sorry if this has been discussed already, I couldn't find anything like it: How can I create a statement like \hat{\xi}(g_0) \longrightarrow \infty \ (g_0 \rightarrow g_0^*), but with the second limit written smaller and below the first arrow? Thanks, Bruno

Thank you. So, what I've written in 1) is correct, i.e. in this case l=11*3 and s=3/2 ? Is there an easy way to understand why Er3+ has this particular configuration and not 4f9-6s2? Regards Bruno

Hello everyone I did an experiment about magnetic susceptibility of Dy_2O_3 and Er_2O_3. For data evaluation I have to calculate the theoretical Landé factor for the paramagnetic atoms in these salts which is defined as g_j=1+\frac{j(j+1)+s(s+1)-l(l+1)}{2j(j+1)} where l and s are the net...

Our math teacher told us it's because Mr. Nobel's wife once cheated on him with a mathematician. :biggrin: Therefore...well, you can figure out the rest. I don't know if you knew the story (I don't know if it's true either). Moral: Even the noblest man is just a man :wink:

Ah, thank you marlon...Britney Spears minus Adobe Photo Shop :biggrin: Favourite female singer? Hm, out of the one or two I know in the first place :rolleyes:, I'd say: Björk

Who has asked you?

:confused: :confused: :confused: How long the communists are in charge now? If they were able or even willing to solve these problems they would have had enough time to do it. totalitary society = gross human right abuses inefficient administration with now democratic control, a lot...

You want the Entropy to be a quantum that adds up when you're looking at more than one system: E. g. if you have two containers filled with gas, you want the relationship S(container A & container B) = S(container A) + S(container B). But if the system A has W_a states and the system B has...

Ah, it's all right, I've just figured out how that works. Good. Very good. The exams may come :biggrin:

Thank you, Hurkyl. I'm still not 100% clear... I understand now why to cut the interval out, but then: let's say we have the square root with sqrt(2)>0 on the complex plane without the negative real axis, and we have f(z)=6z^2-5z+1. If we want to take the square root of f, we have to take...

I've got a homework problem from my function theory course that I never fully understood. It's getting hot again since the exams are nearing...please help :smile: It goes simply like this: Compute the Integral \int_{\vert z \vert=1}\frac{dz} {\sqrt{6 z^2-5 z +1}} The square root is chosen...