Isospin Definition and 66 Threads

hey I am a bit confused re the difference between nuclear spin and isospin. are they the same thing? thanks

Hi, I'm having a little bit of trouble with isospin. What I have gathered so far is that say, for the proton and neutron, apart from their charge they are very similar, so they are considered to be different states of the same particle called the nucleon. So, we say the nucleon has an...

How is weak isospin conserved? Before spontaneous symmetry breaking, it's conserved - by construction. Afterwards, the vacuum expectation value of the Higgs breaks the symmetry. It's the mass terms, and interactions of the Higgs field, where the symmetry is broken, and so there is no...

seems like a basic question and I'm sure many would answer that these are all "spin-1" particles...but that's not their "isospin", right? can someone in the know please straighten things out.

The Gell-Mann - Nishijima relation can be rearranged to show that there is an absolutely conserved quantity which is like a generalization of I3 for anything made of quarks: Q - \frac{B}{2} = I_3 + \frac{(S + C + B^* + T)}{2} Since the LHS terms are absolutely conserved individually, the...

The G-partiy of the pion is -1, which is rotation in isospin space around y-axis by angle \pi followed by C-conjugation. The rotation matrix around y-axis , with angle \pi , is: (e.g. Sakurai, Halzen ..) \begin{pmatrix}0 & 0 & 1 \\ 0 & -1 & 0 \\ 1 & 0 & 0 \end{pmatrix} Thus on \pi^+ : T...

Hello: Can you please explain me what the nuclear isospin is?. Is it a new kind of angular momentum?, and how was it detected ? Regards

what exactly is isospin?

I am a general reader.I found in a book:"Three quarks with I=(1/2) can combine to form I_tot=(1/2) [did not understand] or (3/2) [OK].I_tot = (1/2) gives the nucleons while I_tot = (3/2) forms the baryons. Now,using u and d isospin doublet,I expressed the baryons:uuu,uud,udd,ddd.And found...

Hi All, I'm wondering what the difference is between flavor and isospin. If you own a book by Griffiths titled Elementary Particles, on page 183 in the paragraph above EQ 5.129, he mentions isospin and spin together and the former seems to imply the latter. Does anyone out there know...

This is from Krane, p 389: The neutron and the proton are treated as two different states of a single particle, the nucleon. The nucleon is assigned with a fictious spin vector, called isospin. Nucleon has isospin number t = ½, a proton has m_{t} = 1/2 and neutron has m_{t} = - 1/2 . The...

Hi you guys! I am a little bit confused about nuclear isospin. u and d quarks have I = ½ u has I_3 = ½ , d has I_3 = -½ (third component) right so far? Now why does the proton have I = ½ and I_3 = 1/2, and neutron I = ½ and I_3 = -1/2 ?? but when you add upp the I on the...

In weak desintegrations, the isospin is not necessarily conserved. But is the total angular momentum J=L+S+I always conserved?

This may sounds like a dumb question but I want to figure out the 'point' of them. I know that isospin was an attempt to describe the proton and nucleon as an isospin doublet and that hypercharge seems to me to be a nifty little relation between the electric charge and the isospin - but what...

I have a problem in understanding the dependence by isospin of strong interaction. In this potential one have a lot of operatorial terms which include central, spin-spin, tensor force, spin-orbit terms, and all this four terms multiply by a factor isospin-dependent (tau_i dot tau_j). I don't...

I'm curious about the isospin of a photon. I have been told it is a linear combination of I=1 and I=0. If I=0, then I3 must be 0, but if I=1, what values of I3 are allowed? I don't really have a good idea of how to think about the isospin of this boson because I can't break it down into...