نتایج جستجو برای: 3he
تعداد نتایج: 1796 فیلتر نتایج به سال:
A global, coarse-resolution ocean model previously fitted to geostrophic shear estimates and to data of 10 hydrographic parameters and tracers has been used to simulate the 3He and 4He distributions resulting from the release of mantle helium from mid-ocean ridges. The model is in very good agreement with 14C and chlorofluorocarbon data and has realistic global ocean overturning strength as wel...
The spatial distribution of the geochemical domains hosting recycled crust and primordial (high-3He/4He) reservoirs, how they are linked to mantle convection, poorly understood. Two continent-sized seismic anomalies located near core-mantle boundary—called Large Low Shear Wave Velocity Provinces (LLSVPs)—are potential reservoir hosts. It has been suggested that high-3He/4He hotspots spatially c...
We report on first measurements with polarized electrons stored in a medium-energy ring and with a polarized internal target. Polarized electrons were injected at 442 MeV (653 MeV), and a partial (full) Siberian snake was employed to preserve the polarization. Longitudinal polarization at the interaction point and polarization lifetime of the stored electrons were determined with laser backscat...
We have studied the mass currents through a superfluid 3He Josephson weak link in the presence of an externally applied ac pressure modulation. Characteristic changes in the dc mass currents are observed whenever the superfluid Josephson frequency omega(J) is an integer multiple of the ac modulation frequency omega. The measured dependencies of these current changes on ac pressure amplitude are...
It is needless to say that I feel it a great honor and privilege to have been selected for the 2003 Nobel prize in physics for my theoretical work on superfluid 3He; I am particularly pleased to be sharing the award with Professors Ginzburg and Abrikosov, whom I have always looked up to as giants of the closely related fleld of superconductivity. The story of how, in roughly the twelve-month pe...
Using data obtained between 1991 and 1996 with the SWICS instrument (Solar Wind Ion Composition Spectrometer) aboard the Ulysses spacecraft, a long time average of the (4He/3He) isotopic ratio of 2450 ± 460 in coronal hole dominated solar wind is derived. To assess the influence of inefficient Coulomb friction in the inner corona and to infer the solar photospheric abundance ratio from the sola...
We present a new parameterization of the trinucleon wavefunction. As a novel feature a separable parameterization for the complete wavefunction is given. In this way any calculation that considers two-body currents only is largely simplified. To demonstrate this we calculate the π 3He scattering length in chiral perturbation theory. We find reasonable agreement with experimental values inferred...
The third phase of the Sudbury Neutrino Observatory (SNO) experiment added an array of 3He proportional counters to the detector. The purpose of this neutral-current detection (NCD) array was to observe neutrons resulting from neutral-current solar-neutrino–deuteron interactions. We have developed a detailed simulation of current pulses from NCD array proportional counters, from the primary neu...
N. Mulders Department of Physics and Astronomy, University of Delaware, 223 Sharp Laboratory, Newark, Delaware 19716 (Received 21 December 1998) Liquid 3He in 98%-porous aerogel simultaneously possesses properties of a disordered p-wave superfluid and an elastic solid. We have observed two sound modes of superfluid 3He in aerogel. The first (fast) sound is a compression wave, and the second (sl...
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