A superfluid helium converter for accumulation and extraction of ultracold neutrons

Details A superfluid helium converter for accumulation and extraction of ultracold neutrons A superfluid helium converter for accumulation and extraction of ultracold neutrons

2007-05-27

arxiv.org/abs/0705.3960v1

Phys.Rev.Lett.99:104801,2007

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevLett.99.071302

We report the first successful extraction of accumulated ultracold neutrons (UCN) from a converter of superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. Windowless UCN extraction is performed in vertical direction through a mechanical cold valve. This prototype of a versatile UCN source is comprised of a novel cryostat designed to keep the source portable and to allow for rapid cooldown. We measured time constants for UCN storage and extraction into a detector at room temperature, with the converter held at various temperatures between 0.7 and 1.3 K. The UCN production rate inferred from the count rate of extracted UCN is close to the theoretical expectation.

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