Results 171 to 180 of about 32,253 (225)

Anomalous helium-bubble growth in palladium

Physical Review B, 1994
Helium-bubble growth in \ensuremath{\alpha}-implanted palladium has been investigated by positron-lifetime measurements as a function of isothermal annealing time, t. The bubble radius shows first an expected ${\mathit{t}}^{1/6}$ variation and then an anomalous time dependence faster than ${\mathit{t}}^{1}$.
, Rajaraman, , Viswanathan, , Valsakumar, , Gopinathan   +3 more
openaire   +2 more sources

Synergistic effects in hydrogen–helium bubbles

Journal of Physics: Condensed Matter, 2012
The detrimental effects of hydrogen and helium on structural materials undergoing irradiation are well documented, if not well understood. There is experimental evidence to suggest that a synergistic effect between the two elements exists, which results in increased damage when both are present.
Erin, Hayward, Chaitanya, Deo
openaire   +2 more sources

Multielectron Bubbles in Liquid Helium

Journal of Low Temperature Physics, 2020
Multielectron bubbles (MEBs) are cavities in liquid helium that contain electrons and possibly vapour. They provide a versatile platform for exploring properties of interacting electrons in two dimensions in a regime of densities that has not been previously available.
Neha Yadav, Pranaya Kishore Rath, Zhuolin Xie, Yunhu Huang, Ambarish Ghosh   +4 more
openaire   +1 more source

Superconductivity in Multielectron Bubbles in Helium

AIP Conference Proceedings, 2006
Superconductivity on a spherical, two‐dimensional surface is investigated in the context of multielectron bubbles in liquid helium, where the electron‐ripplon coupling is the underlying mechanism leading to pairing. In this contribution, we apply a BCS‐like self‐consistent mean‐field theory to calculate the superconducting gap.
Tempere, Jacques, Gladilin, Vladimir, Silvera, I.F., Devreese, Jozef   +3 more
openaire   +2 more sources

Positronium bubble in liquid helium

Journal of Physics B: Atomic and Molecular Physics, 1976
Accurate positron lifetime measurements have been performed in liquid helium-4 under saturated vapour pressure between 4.2K and 1.5K. The annihilation rate of free positrons is found to be proportional to the density of helium, indicating that no clustering of atoms occurs around the positrons.
P Hautojarvi, K Rytsola, M T Loponen
openaire   +1 more source

Helium bubble bursting in tungsten

Journal of Applied Physics, 2013
Molecular dynamics simulations have been used to systematically study the pressure evolution and bursting behavior of sub-surface helium bubbles and the resulting tungsten surface morphology. This study specifically investigates how bubble shape and size, temperature, tungsten surface orientation, and ligament thickness above the bubble influence ...
Faiza Sefta, Niklas Juslin, Brian D. Wirth   +2 more
openaire   +1 more source

Liquid Helium Bubble Chamber

1960
In order to study liquid helium as a bubble chamber fluid, experiments have been performed on a small cylindrical chamber 4 inches long and 1–1/2 inch in diameter. 1 Results indicate that usable tracks can be formed throughout the operating pressure region from atmospheric pressure down to 200 mm Hg.
W. M. Fairbank, M. E. Blevins, M. M. Block, M. J. Buckingham, E. M. Harth, J. Leitner, G. G. Slaughter   +6 more
openaire   +1 more source

Structure of multielectron bubbles in liquid helium

Physical Review B, 1992
We present a detailed density-functional calculation for multielectron bubbles with charges {ital z}{le}50. The calculation is similar to that for metal clusters, but we found no obvious shell structure in the charged bubbles. The exchange-correlation interaction has the important effect of reducing the bubble radius and, hence, enhances its stability.
, Shung, , Lin
openaire   +2 more sources

Multielectron Bubbles in Helium and Wigner Crystallization

Journal of Low Temperature Physics, 2005
Multielectron bubbles (MEBs) in superfluid helium support a two-dimensional electron gas (2deg) on the surface of a sphere. In principle, electron densities can range from ∼ 10 10 to 10 14 /cm 2 .
Silvera, Isaac F., Kim, Heetae, Tempere, Jacques, Devreese, Jozef   +3 more
openaire   +2 more sources