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← ScienceWhich mechanism causes alpha particle emission within unstable, heavy nuclei?
A)Quantum tunneling avoids potential barriers✓
B)Neutron decay surpasses binding energy
C)Collective motion induces fission
D)Shell effects decrease nuclear stability
💡 Explanation
Alpha decay occurs via quantum tunneling, where alpha particles penetrate the potential barrier despite insufficient energy because the wave function exhibits a finite probability inside allowed regions; therefore tunneling allows escape rather than classical over-barrier decay.
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