Using velocity-analyzed cold neutrons we observed the production of ultracold neutrons in superfluid ⁴He at 0.45 to 1.5 K. Ultracold neutrons are produced for an incident neutron wavelength of 8.78±{}0.06 {} which agrees with the single-phonon emission theory. The temperature variation of the ultracold-neutron storage lifetime is also discussed.
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Yoshiki et al. (1992) studied this question.