ULTIMA: Magnetic field dependence of the calibration factor

Johannes Elbs (1) , Clemens Winkelmann (2) , Yuriy M. Bunkov (1) , Eddy Collin (1) , Henri Godfrin (1)

1 NEEL - UBT - Ultra-basses températures
2 NEEL - QuNES - Nano-Electronique Quantique et Spectroscopie

ULTIMA is a project which proposes to use superfluid 3He as a sensitive medium for direct dark matter search. In this paper we report on new, detailed calibrations of our bolometric cells as a function of the magnetic field. An influence on the order of 20% is observed for magnetic fields up to 330 mT. Simultaneous measurements of neutron capture and heater events, releasing both a well defined energy, show that the effect is similar for both, and that it is possible to maintain a good calibration by an appropriate correction.

Mots clés: bolometry; superfluid 3He; magnetic field dependence

Domaines: Electrons fortement corrélés [cond-mat.str-el]

Johannes Elbs, Clemens Winkelmann, Yuriy M. Bunkov, Eddy Collin, Henri Godfrin. ULTIMA: Magnetic field dependence of the calibration factor. Journal of Low Temperature Physics, 2008, 151, pp.860. ⟨10.2007/s10909-008-9756-z⟩. ⟨hal-00921388⟩