Particle detection by evaporation from superfluid helium

Details Particle detection by evaporation from superfluid helium Particle detection by evaporation from superfluid helium

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvl..68.2429b&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 68, no. 16, April 20, 1992, p. 2429-2432. Research supported by NSF.

Physics

12

Alpha Particles, Cesium Isotopes, Evaporation, Helium, Superfluidity, Bolometers, Compton Effect, Gamma Rays, Neutrinos, Phonons, Rotons

Scientific paper

The first experiments in which 5-MeV alpha particles are detected via evaporation from a bath of superfluid helium are reported. The alpha 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 compared with expectations. Evaporation induced by a gamma flux from Cs-137 source has been detected.

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