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Measurements on the generation and subsequent decay of vorticity in superfluid He-3-B

Bradley, D.I. and Fisher, Shaun and Hayes, WM (1998) Measurements on the generation and subsequent decay of vorticity in superfluid He-3-B. In: COSMO-97 : First International Workshop on Particle Physics and the Early Universe. World Scientific, Singapore, pp. 432-434. ISBN 9789810235277

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Abstract

Recent measurements in superfluid He-3-B have been interpreted as evidence in support of the Kibble-Zurek hypothesis for the formation of defects in the early Universe. The superfluid He-3 analogue to the cosmic string is the quantum vortex. We report here the first observations on the production and decay of this vorticity in superfluid He-3-B at temperatures down to similar to 110 mu K. We detect the heat evolution of the decaying vorticity after neutron irradiation of a small superfluid He-3-B sample. We interpret the decay process in terms of a simple exponential time constant which varies inversely proportional to the quasiparticle excitation number density in the superfluid. We also observe that the fraction of the neutron energy deposited in the vorticity is consistent with the earlier measurements which supported the Kibble-Zurek hypothesis.

Item Type: Contribution in Book/Report/Proceedings
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 65443
Deposited By: ep_importer_pure
Deposited On: 24 Jun 2013 16:12
Refereed?: No
Published?: Published
Last Modified: 10 Oct 2017 20:05
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/65443

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