Original scientific paper
Radioactive charge carriers in liquid helium created from fast nuclear beams
Noriaki Takahashi
; Osaka Gakuin University, Kishibe-Minami 2-36-1, Suita/Osaka, 564-8511 Japan
Abstract
An ionic positive charge in superfluid helium exists in the form of an aggregate of helium atoms around a core ion and is called a "snowball". Positively charged impurities were created through injection of fast nuclear beams into liquid helium. The transport of positive charges in liquid helium was traced through the measurements of electric currents and of radioactive decays of the impurity ions. Applied electric fields of both directions controlled the movements of impurity ions unambiguously. Production rates of snowballs and of neutrals from the injection of nuclear beams have been estimated. The rates change differently for various ions used, not only with temperature of the liquid helium but also with spatial density of the incident fast beams.
Keywords
snowballs; radiation detection method; radioactive nuclear beams; liquid 4He
Hrčak ID:
305218
URI
Publication date:
4.5.2003.
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