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tunneling(encyclopedia)
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tunneling effect (medicine)


tunneling effect
<radiobiology> In quantum mechanics, a particle approaching a potential energy barrier of finite extent has a chance (usually small) of tunneling through the barrier, even though it lacks the energy to go over the barrier. Tunneling plays a strong role in fusion reactions: particles which do not have enough energy to climb over the electrostatic energy barrier (into the region where nuclear attractions dominate) can still fuse by tunneling through.