Helium-4
Mutual-friction induced instability of normal-fluid vortex tubes in superfluid helium-4
... At temperatures smaller than 2.17 K (the lambda point), the quantum field that describes helium-4 becomes Bose-Einstein condensed, giving rise to a non-zero ground state that cor- responds to an inviscid ...
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Timing Characterization of Helium-4 Fast Neutron Detector with EJ-309 Organic Liquid Scintillator
... Fig. 8 shows the experimental setup for measuring the PMT- based Helium-4 fast neutron detectors. The PMT high voltage was set as 1356V (for node A003E) and 1538V (for node A003D) respectively to match the ...
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Energy spectra of finite temperature superfluid helium-4 turbulence
... superfluid helium-4 based on coupled Langevin-Navier-Stokes dynamics is ...in helium II, indicates that the spectral structure of normal-fluid and superfluid turbulence is significantly more complex ...
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Pulse Shape Analysis and Discrimination for Silicon-Photomultipliers in Helium-4 Gas Scintillation Neutron Detector
... natural helium (helium-4), the Arktis 180-bar pressurized gas scintillator is capable of detecting and distinguishing fast neutrons and ...the helium-4 gas volume; consequently, no ...
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Decay of finite temperature superfluid helium-4 turbulence
... superfluid helium-4, that describes the dynamics of individual topolog- ical defects of the ground state (superfluid vortices) and their (self-consistent) interactions with its quasi-particle excitations ...
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Superfluid helium-4 hydrodynamics with discrete topological defects
... the physics of the corresponding couplings: the Iordanskii force is a consequence of the wave-function dynamics of the normal-fluid at the pre second-quantization level. Indeed, since κ = h/m, where h is Planck’s ...
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Interactions between normal-fluid and superfluid vortex rings in helium-4
... Abstract –By employing both vortex-dynamical and self-consistent Navier-Stokes methods of analysis, an investigation of interactions between normal-fluid and superfluid vortex rings in helium-4 is ...
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Creation of quantized vortices at the lambda transition in liquid Helium 4
... fast (average ∼ 1 ms −1 ), we may note that there is no relative motion at all between the top and bottom surfaces of the cell and helium adjacent to them; the flow that occurs will presumably be due to the second ...
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Optomechanics with Superfluid Helium 4
... In the first design, assuming the indium seals did not add height to the valve, the needle traveled about 0.050” to make contact with the seal. Given the bellows spring rate of 40.33 lb/in., this distance required about ...
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Light Ion Yields from Bombardment of Thick Targets by Protons, Helium-4 and Iron-56
... protons, helium and iron in thick targets of aluminium of 20, 40, and 60 g/cm 2 thickness were obtained from accelerator-based measurements performed at NSRL in March ...
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Double Charge Exchange of Pions on Helium-4
... chamber segment are connected to a single delay line, the two ends of. wMch are connected through discriminators to time-to-digital converters[r] ...
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An Investigation in the Dynamics of Polarized Helium-3 in Superfuid Helium-4 for the Spallation Neutron Source (SNS)neutron-electric-dipole-moment (nEDM) experiment.
... The second attempt was successful. The superconducting wire is 0.33 mm, 54 filament NbTi wire. The coils are hand wound with assistance from a large lathe in the Duke University machine shop. The wires are covered ...
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Detecting the anti-hypertriton and anti-helium-4 from the RHIC
... The ideal of antimatter can be traced back to the end of 1890s, when Schuster discussed a hy- pothesis of the existence of antiatoms as well as antimatter solar system by hypothesis in his letter to Nature magazine [2]. ...
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Detection and reconstruction of short-lived particles produced by neutrino interactions in emulsion
... One of these neutrinos was associated with the electron (now known as the ν e ). Occasionally, when the focus is on isotope composition, the proton, deuteron and helium-4 nuclei will be [r] ...
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Precision X-ray spectroscopy of kaonic atoms as a probe of low-energy kaon-nucleus interaction
... The strong interaction induced 2 p level shift and width are measured for both kaonic helium-3 and helium-4 atoms, and it is the first time that kaonic helium-3 X-rays are measured. The results ...
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Superconductivity and Superfluidity Part III: Superfluidity as a Consequence of Ordering of Zero point Oscillations
... liquid helium-4 are electrically neutral, as they have no dipole moments and do not form ...liquid helium (as well as in other condensed substance where phase transfor- mations are related to the ...
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Performance Analysis of a Helium Turboexpander for Cryogenic Applications with a Process Modeling Tool: Aspen HYSYS
... Performance analysis of various equipment like compressor, expander, control valves, distillation column, that plays a keen role in a Cryogenic plant can all be analyzed for its performance by this process modeling tool. ...
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The Revision of the Alleged Spherical Atom Model of Helium
... of Helium—the element with the most simple singular atoms—, the symmetry of the double-occupied 1s orbital is assumed as strictly spherical, exhibiting no asymmetry or ...
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Energy Consumption Analysis and Comparison of HPC and HPS of HTR-10
... reactors, CEA has started to build up some helium loops. To test the components, representative conditions have to be reached: temperature, pressure and chemical gaseous composition. To control the chemical ...
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Aghai-Khozani, Hossein (2016): Cascades of antiprotonic helium measured at very low densities. Dissertation, LMU München: Fakultät für Physik
... readout a triangular-shaped waveguide made of the same material coupled the plate optically to a 34 mm diameter custom made fine mesh photomultiplier tube (PMT, Hamamatsu Photonics R5505 GXASSY2). The photomultiplier ...
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