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Showing 1 to 20 of 146 for “"3He"”.
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Exclusive Photodisintegration of 3He
<p>Kinematically complete measurements of three-body photodisintegration of $^3$He were performed at the High Intensity $\gamma$-ray Source (HI$\gamma$S) with nearly monoenergetic 15 MeV photons. The experiment relied on two-nucleon coincidence measurements in which the nucleons are emitted on …
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Demagnetisation of solid 3He and supercritical superflow
… low temperature experiments with superfluid 3He as medium of interest. The experiments are mostly performed at temperatures below 200uK, in the regime where superfluid quasiparticle excitations are ballistic. Recently, a novel experimental tool has been built in Lancaster - a superconducting …
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Electro-Pionproduction from P, D, and 3He
The cross section for the p(e,e'rr+)n, d(e,e'rr+)2n and 3 He(e,e'rr+)3H reactions are calculated using a simple model with pion, nucleon and D.-resonance degrees of freedom for the kinematical conditions used in a recent Saclay experiment. For the d( e, e'rr+)2n reaction, final state interactions …
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Critical flow velocity in super fluid 3He-B
… in uniform linear motion through superfluid 3He-B. The latter experiments led to an astonishing discovery of no discontinuity in the dissipation for an object in uniform linear motion at the Landau critical velocity. The experiments were performed in a “Lancaster style” nested experimental …
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Properties of the 3He A-B phase boundary
This thesis deals with various properties of the 3He A-8 phase boundary. First a review of some static properties, the surface energy and Kapitza resistance, is given. Then the symmetry of the interface is discussed. It is pointed out that, due to the presence of the condensate, many symmetries are …
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Low Density 2D-Electron Sheets on Liquid 3He Surfaces
… with electron mobility on the surface of 3He were carried out. Mobility measurements were done in the temperature range 0.6-600mK, the operating frequencies 1Hz-100kHz, the excitation voltage 4mV - 1V and pressing electrical fields 0-255V/cm on the top electrode and 0-47.5V/cm for three …
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Studies of Lung Micromechanics via Hyperpolarized 3He Diffusion NMR
… dissertation lung morphometry is performed via 3He diffusion MRI in order to measure the average alveolar depth and alveolar duct radius at multiple levels of both inspiration and expiration in in vivo human subjects and in explanted human and canine lungs. Average alveolar volume, surface area, …
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Quantification of Pulmonary Ventilation using Hyperpolarized 3He Magnetic Resonance Imaging
… for evaluating lung function. Hyperpolarized 3He magnetic resonance imaging (MRI) is a relatively new technique, and quantitative measurements derived from these images, specifically the ventilation defect volume (VDV) and ventilation defect percent (VDP) have the potential to provide new …
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Transport of 3He for the nEDM experiment at the SNS
… cm}. This experiment utilizes polarized 3He in superfluid 4He to detect neutron precession in a 30 mG magnetic field and 75 kV/cm electric field via the spin dependent reaction \mathrm{n}\mathrm{+^{3}He}\rightarrow\mathrm{p}\mathrm{+^{3}H}+764\mathrm{\,KeV}. Polarized 3He is produced by …
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Studies of a D-3He Fueled Closed Surface Multipole Confinement Device
Made available in DSpace on 2017-07-06T18:48:11Z (GMT). No. of bitstreams: 3 Ghanbari_Ebrahim_MS.pdf: 24621605 bytes, checksum: e40a7f0f5c546d34c493acae77ef55ed (MD5) Ghanbari_Ebrahim_MS_ABS.pdf: 521383 bytes, checksum: 3d3c4f4eb6dee1438935511c245866d4 (MD5) license.txt: 4813 bytes, checksum: …
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B phase nucleation and A-B interface dynamics in superfluid 3He
… and subsequent expansion of the superfluid 3He-B phase in the metastable, hypercooled A phase. An overview of the theory of dynamical phenomena in Fermi superfluids is presented in Chapter 1 with an eye towards formulating a theory suitable for studying the dynamics of the first order A-B …
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Medida del espectro neutrónico con un detector de 3He en el experimento TARC
… basado en la reacción de captura neutrónica en 3HE. Básicamente se trata de una carcasa de acero que contiene una mezcla de gases (Entre los que se encuentra el 3HE) en la que se tiene identificado un volumen de control limitado por unos electrodos. Esos electrodos generan una corriente por …
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Measurments of Correlated Pair Momentum Distributions in 3He(e,e'pp)n With CLAS
<p>We have measured the <sup>3</sup>He(e,e'pp)n reaction at 2.2 and 4.4 GeV over a wide kinematic range. The kinetic energy distribution for ’fast’ nucleons (p > 250 MeV/c) peaks where two nucleons each have 20% or less and the third or ‘leading’ nucleon carries most of the transferred energy. …
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