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Liquid helium |
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Liquid helium |
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Transversely polarized cold neutrons traveling through liquid helium experience a PV spin rotation due to the weak interaction with an angle proportional to a linear combination of these weak meson exchange amplitudes. According to theory, when liquid helium is pushed through a tiny hole at ultracold temperatures, the substance oscillates at a frequency that, when amplified electronically, sounds like a whistle. room temperature down to liquid helium temperatures in a 5-10 minute time period). |
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