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Abstract
We report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease (fomblin). We employed our special technique of window-free extraction of accumulated UCN from the superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. The fomblin-coating reduced the time constant for UCN passage through the extraction hole by a factor three compared to our previous experiment employing an uncoated stainless steel vessel. A time-of-flight measurement of the cold neutron spectrum incident on the converter, combined with a gold foil activation, allowed us to determine both the single-phonon and multi-phonon contributions to the UCN production. The UCN production rate is in reasonable agreement with the theoretical expectation.
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Details
1 Physik-Department E18, Technische Universität München, Garching, Germany; Institut Laue-Langevin, Grenoble, France
2 Physik-Department E18, Technische Universität München, Garching, Germany; Institut Laue-Langevin, Grenoble, France; Paul Scherrer Institut, Villigen PSI, Switzerland
3 Physik-Department E18, Technische Universität München, Garching, Germany; Paul Scherrer Institut, Villigen PSI, Switzerland; Paul Scherrer Institut, Villigen PSI, Switzerland
4 Physik-Department E18, Technische Universität München, Garching, Germany
5 Forschungsreaktor München FRM II, Garching, Germany
6 Paul Scherrer Institut, Villigen PSI, Switzerland