isoscalar nucleus

[krishna mohan]

What is an isoscalar nucleus?

I guess it should be a nucleus with isospin T=0.

In the place where I encountered it, it seems to refer to a nucleus with equal number of neutrons and protons. An isoscalar target should necessarily have equal number of neutrons and protons. But as far as I can see, equal number of neutrons and protons does not mean an isoscalar target.

Is that right, or am I missing something?

[Vanadium 50]

No, you're right. An isoscalar target should be one with T=0, but in fact, it means "same number of neutrons as protons". That's just the way things are.