What is giant resonance? - QS Study
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Giant resonance are usually classified by three characteristic quantum number : L, S and T

Where, L= Orbital angular momentum

S= Intrinsic spin

T= Isospin

L can have the values, 0, 1, 2, 3, …………………………..

The spin quantum no. S is either 0 or 1.

The isospin quantum no. T which is also either 0 or 1 (in this case)

T determines the relative behavior of protons and neutrons.

A giant resonance is called isoscalar giant resonance when T=0

ie; protons and neutrons oscillate in phase.

Example: electric monopole resonance (L= 0, S= 0, T=0).

Agiant resonance is called isovector giant resonance when T= 1,

ie; protons and neutrons oscillate with opposite phase.

Example: Gamow-Teller resonance (L= 0, S= 1, T= 1).