User:Delayedchoice/sandbox
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change eqn 4 to eqn 3???
Professor Feynman (Lect. on Phys., v. 3, 1965, ps. 3-7 to 3-9) maintained in his neutron scattering off a crystal experiment that which-way information can exist even if one does not perform a measurement. This interaction involves the possibility of a spin flip for both the neutron and nucleus that the neutron scatters off. With the flip, the spin of the nucleus that the neutron scattered off becomes different than the spin direction of the other nuclei in the crystal that the neutron could have scattered off but did not. The spins of the other nuclei are the same. It may be possible to eliminate the which-way information as long as particle detections have not been made, either through spin-lattice relaxation after the neutron-nucleus interaction occurs or through shutting off the uniform, strong, external magnetic field B that initially aligns all of the spins of the crystal nuclei along the same axis. A delayed choice allows for obtaining either a probability distribution showing interference or instead one showing which-way information.