Two Berkeley experimenters report they have produced a new kind of energetic neutral excitation in superfluid helium that travels centimeters without scattering. Clifford M. Surko and Frederick Reif, writing in Phys. Rev. Letters 20, 582 (1968) speculate that they are seeing an excited helium atom. If their interpretation is correct, the experiment is an interesting combination of atomic and low‐temperature physics.
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© 1968 American Institute of Physics.
1968
American Institute of Physics
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