Computer Science
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9233119l&link_type=abstract
Unknown
Computer Science
Beryllium 7, Detection, Helium Isotopes, Particle Interactions, Radiation Detectors, Radiation Measurement, Solar Neutrinos, Superfluidity, Calorimeters, Protons
Scientific paper
In this report we describe results of experiments to detect low energy radiation in superfluid helium. The ultimate aim of this research is to establish the feasibility of this technique for use in detecting neutrinos from the p-p and Be-7 reactions in the sun. In these experiments we have seen the first detection of 5.5 MeV (alpha) particles via evaporation from a bath of superfluid helium. An (alpha) particle 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 evaporated atoms are detected calorimetrically by a thin wafer suspended above the liquid. The approximate overall efficiency of this process has been determined and we compare the experimental results with expectations. We have also been able to detect evaporation induced by a flux of gamma rays from a Cs-137 source. Preparations made for new experiments are also discussed.
Lanou Robert E.
Maris Humphrey J.
Seidel George M.
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