Recent content by Winga

I had read it already, but it is not detail enough. I just wonder the nuclear spin quantum number for some NMR active elements and their isotopes, but I have a difficulty in pairing up of nucleons.

Are these 4 states degenerate?

This is what I wonder. Is it the 1st one is upaired, 2nd ---> paired with the 1st one 3rd ---> unpaired 4th ---> paired with the 3rd one

I don't know how nucleons occupy each energy level, especially the one with multiple states. For example, 1p[SIZE="1"]3/2, there are 4 states in this level, that can be occupied 4 nucleons. If there are 2 nucleons in this level, do they must be paired-up? Why? And if there are 3...

Is the vibrational frequency V0 equal to V1? V0 -> V1, increases in frequency, amplitude or both? If V0 -> V2, increases in frequency, amplitude or both?

Does the tilted angle relate to the nuclear spin quantum number, 1/2?

So, no torque, no precession...but why protons do not align their magnetic moments to the Bo? I mean what factors make them not to align, just like the case in NMR.

How about if the orientation of plane of this circular orbit is exactly perpendicular to the B-field, will there be no precession?

So, the angle is caused by the orientation of plane of this circular orbit but not due to any forces, right?

What makes the magnetic moment with a tilting angle? (shown in green)

I would like to know how the magnetic field generated by spinning protons interacts with the external B-field. Do we need to use the term, torque, to explain the precession?

And this phenomenon also occurs in neutrons?

In this case, there are 3 nuclei and 2 bonds. I don't understand what is exchange interaction, and what is the orientation of magnetic moment of the middle nucleus should be?

Yes, this is what I want to know. Actually, I have a problem about the principal of NMR, which is the spin-spin coupling/J-coupling. I find that some reference books have not told that the spin interaction between two nuclei is via bonding electrons. From Fermi-contact interaction, the...

For protons, the spin of one up quark cancels out the spin of one down quark, and one up quark left with spin value 1/2?