6,686 research outputs found
Phase oscillations in superfluid 3He-B weak links
Oscillations in quantum phase about a mean value of , observed across
micropores connecting two \helium baths, are explained in a Ginzburg-Landau
phenomenology. The dynamics arises from the Josephson phase relation,the
interbath continuity equation, and helium boundary conditions. The pores are
shown to act as Josephson tunnel junctions, and the dynamic variables are the
inter bath phase difference and fractional difference in superfluid density at
micropores. The system maps onto a non-rigid, momentum-shortened pendulum, with
inverted-orientation oscillations about a vertical tilt angle , and
other modes are predicted
Probing Active to Sterile Neutrino Oscillations in the LENS Detector
Sterile neutrino conversion in meter scale baselines can be sensitively
probed using monoenergetic, sub-MeV, flavor pure e-neutrinos from an artificial
MCi source and the unique technology of LENS designed to oberve the low energy
solar neutrino spectrum via tagged CC e-neutrino capture in 115-In.
Active-sterile oscillations can be directly observed in the granular LENS
detector itself to critically test and extend resuls of short baseline
accelerator and reactor experiments.Comment: 4pages, 4 figures, text and figure change
Diagnostics of macroscopic quantum states of Bose-Einstein condensate in double-well potential by nonstationary Josephson effect
We propose a method of diagnostic of a degenerate ground state of Bose
condensate in a double well potential. The method is based on the study of the
one-particle coherent tunneling under switching the time-dependent weak
Josephson coupling between the wells. We obtain a simple expression that allows
to determine the phase of the condensate and the total number of the particles
in the condensate from the relative number of the particles in two wells
measured before the Josephson coupling is switched on and
after it is switched off. The specifics of the application of the method in the
cases of the external and the internal Josephson effect are discussed.Comment: 3 page
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