Spectroscopic Study of Scattering of UCN by Liquid He4

  • E. Gutsmiedl
  • R. Golub
  • J. Butterworth
Part of the NATO ASI Series book series (NSSB, volume 257)


We report on our first recent measurements of the energy spectrum of upscattered Ultra-Cold-Neutrons in liquid He4 at temperatures around 1 Kelvin. The measurements were made on the Superthermal UCN Source at the ILL [1]. This source produces UCN’s in liquid He4 by down-scattering (phonon-emission) of 10 Å neutrons. The UCN’s produced in this way are stored in the He4 container, since they are totally reflected from the walls. The UCN’s can gain energy through scattering by Phonons [3] and Rotons [3], and hence leave the container. We have measured the spectrum of these upscattered neutrons by using a pseudo statistical chopper [4]. The first preliminary measurements show a discrepancy with the spectrum expected on the basis of phonon and roton scattering.


Scattered Neutron Recent Measurement Preliminary Measurement Hydrodynamic Limit Cold Neutron 
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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • E. Gutsmiedl
    • 1
    • 3
  • R. Golub
    • 1
    • 2
  • J. Butterworth
    • 1
    • 3
  1. 1.Technical University of MünchenGarchingFrance
  2. 2.Technical University of Berlin and ILL GrenobleFrance
  3. 3.ILL GrenobleFrance

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