Abstract
A kinetic description of ballistic molecular heat pulses is presented. By solving the Boltzmann equation containing a source term we study the explicit time and space dependence of these pulses for various types of sources and detectors. Assuming that in the case of ${}^{4}$He the source consists of a pointlike source that radiates Maxwellian pulses, the agreement with experimental findings is excellent for point or extended particle detectors. In the case of ${}^{3}$He beams one needs to introduce two sources of different temperatures. This may be attributed to the enormous difference of heat conductivity of ${}^{3}$He and superfluid ${}^{4}$He films.
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