Journal Title

Physical Review Letters

Publication Date

4-20-1992

Abstract

We report the first experiments in which 5-MeV alpha particles are detected via evaporation from a bath of superfluid helium. The α excites phonons and rotons in the liquid helium, and these excitations are sufficiently energetic to evaporate helium atoms when they reach the free surface of the liquid. The approximate overall efficiency of this process has been determined, and we compare this with expectations. We have also been able to detect evaporation induced by a flux of γ’s from a 137Cs source.

Subjects

Liquid helium; Solar neutrinos; Helium at low temperatures

Publication Information

Copyright 1992 The American Physical Society. The original published version of this article may be found at http://dx.doi.org/10.1103/PhysRevLett.68.2429.

DOI

10.1103/PhysRevLett.68.2429

Peer-Reviewed

Yes

Document Type

Journal Article

Included in

Physics Commons

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