Protons and Neutrons Are Fermions

Protons and neutrons are fermions.The nucleus of helium-4 contains two protons and two neutrons.Which of the following spin states are allowed for the nucleus of a helium-4 atom?

A) both protons spin up,both neutrons spin up
B) both protons spin up,both neutrons spin down
C) one proton and one neutron spin up and one proton and one neutron spin down
D) All are correct.
E) None are correct.

Correct Answer:

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