Particle detection by evaporation from superfluid helium

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 t...

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Bibliographic Details
Published in:Physical review letters 1992-04, Vol.68 (16), p.2429-2432
Main Authors: BANDLER, S. R, LANOU, R. E, MARIS, H. J, MORE, T, PORTER, F. S, SEIDEL, G. M, TORII, R. H
Format: Article
Language:English
Subjects:
440103 - Radiation Instrumentation- Nuclear Spectroscopic Instrumentation
440104 - Radiation Instrumentation- High Energy Physics Instrumentation
ALPHA DETECTION
BASIC INTERACTIONS
CHARGED PARTICLE DETECTION
COMPTON EFFECT
DATA
DETECTION
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EVAPORATION
EVEN-EVEN NUCLEI
Exact sciences and technology
EXPERIMENTAL DATA
FERMIONS
GAMMA DETECTION
HELIUM 4
HELIUM ISOTOPES
INFORMATION
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
INTERACTIONS
ISOTOPES
LEPTONS
LIGHT NUCLEI
MASSLESS PARTICLES
NEUTRINOS
NUCLEI
NUMERICAL DATA
PARTICLE IDENTIFICATION
PHASE TRANSFORMATIONS
Physics
QUASI PARTICLES
RADIATION DETECTION
ROTONS
SCATTERING
STABLE ISOTOPES
Statistical physics, thermodynamics, and nonlinear dynamical systems
SUPERFLUIDITY
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
Transport processes
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Description
Summary: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. (Author)
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.68.2429