A highly sensitive nuclear recoil detector based on superfluid3He-B

Bradley, D.I. and Bunkov, YM and Cousins, DJ and Enrico, MP and Fisher, SN and Follows, MR and Guénault, A.M. and Hayes, WM and Pickett, GR and Sloan, T (1995) A highly sensitive nuclear recoil detector based on superfluid3He-B. Journal of Low Temperature Physics, 101 (1-2). pp. 9-16. ISSN 0022-2291

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Abstract

The excitations in superfluid(3) He have a dispersion curve in which the energy minimum does not coincide with the momentum minimum. As a result, when a mechanical resonator moves through a gas of such excitations, normal and Andreev scattering processes introduce a large asymmetry into the momentum exchange and the mechanical resonator experiences a very large drag force. A gas of such excitations is thus very easy to detect even at very low densities. We have exploited this effect to monitor the increase in excitation density in a small volume caused by a particle interaction. The working volume is filled with superfluid(3) He-B at around 100 mu K. A particle undergoing an interaction in the volume releases a shower of quasiparticle excitations which can be detected by the increase in damping on a vibrating wire resonator. A small hole in the container allows the excitations to leak out into the outside colder liquid to reset the working liquid to the resting state. Using an existing experiment we can detect nuclear recoil interactions depositing energies as low as 500 eV. Two simple modifications should allow us to detect interactions in the 10 eV range.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Low Temperature Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2500/2500
Subjects:
?? general materials scienceatomic and molecular physics, and opticscondensed matter physicsmaterials science(all) ??
ID Code:
65439
Deposited By:
Deposited On:
24 Jun 2013 14:39
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Jul 2024 09:24