Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Humphrey J"'
Autor:
Yiming Xing, Humphrey J. Maris
Publikováno v:
Journal of Low Temperature Physics. 201:634-657
We present a review of the properties of negative ions that are produced when electrons are inserted into superfluid helium-4. It is convenient to divide the ions into two groups. The first is the ion usually referred to as the “normal electron bub
Publikováno v:
Journal of Low Temperature Physics. 185:313-323
Exotic ions are negatively charged objects which have been detected in superfluid helium-4 at temperatures in the vicinity of 1 K. Mobility experiments in several different labs have revealed the existence of at least 18 such objects. These ions have
Autor:
Humphrey J. Maris, D. Jin
Publikováno v:
Journal of Low Temperature Physics. 158:317-323
We have performed computer simulations of the motion of electron bubbles through superfluid helium. The helium is modeled through the use of a modified version of the Gross-Pitaevskii equation. We find that by the time the bubble reaches the velocity
Autor:
Humphrey J. Maris, Ambarish Ghosh
Publikováno v:
Journal of Low Temperature Physics. 134:251-256
We have perforated a series of experiments to study cavitation in superfluid helium into which electrons are injected by field-emission from a sharp tip. The injected electrons force open small cavities in the liquid (“electron bubble”). These ob
Autor:
George M. Seidel, R. E. Lanou, Y.H Kim, John S. Adams, Humphrey J. Maris, Y. H. Huang, A. Fleischmann
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 444:51-54
We report recent progress in the development of HERON, a detector of low-energy solar neutrinos that will use as a target material 10 tons of liquid helium. The HERON detector is intended to detect p–p neutrinos from the sun in real time with a an
Publikováno v:
Journal of Low Temperature Physics. 114:523-545
We present an analysis of the small amplitude shape oscillations of a superfluid helium drop surrounded by saturated helium vapor. The equations of the two-fluid model are used to describe the liquid motion within the drop. The calculations are perfo
Publikováno v:
Journal of Low Temperature Physics. 113:1121-1128
An electron stopped in superfluid helium generates phonons and rotons in the liquid as well as uv photons via scintillation. We report recent measurements with single 364 ke V electrons. A sapphire wafer with a superconducting transition-edge sensor
Publikováno v:
Journal of Low Temperature Physics. 98:17-35
We describe experiments on the laser levitation of superfluid helium. Liquid drops of 10–20 μm diameter are produced by a submerged piezoelectric transducer and suspended in vapor at 2K for up to 3 minutes. The optical trap is formed by two counte
Autor:
Christian Enss, G. Goldhaber, George M. Seidel, F. S. Porter, R. E. Lanou, Humphrey J. Maris, S. R. Bandler, T. More
Publikováno v:
Journal of Low Temperature Physics. 93:715-720
Alpha particles stopped in a 3 liter volume of liquid helium at 30 mK are observed by the calorimetric detection of helium atoms evaporated from the free surface of the liquid. Quantum evaporation of the helium is produced by the rotons that are crea
Autor:
F. S. Porter, Simon R. Bandler, R. H. Torii, Humphrey J. Maris, George M. Seidel, T. More, R. E. Lanou
Publikováno v:
Physical Review Letters. 68:2429-2432
We report the first experiments in which 5-MeV alpha particles are detected via evaporation from a bath of superfluid helium. The {alpha} excites phonons and rotons in the liquid helium, and these excitations are sufficiently energetic to evaporate h