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Träfflista för sökning "WFRF:(Jonsell Svante) "

Sökning: WFRF:(Jonsell Svante)

  • Resultat 51-60 av 116
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51.
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54.
  • Froelich, Piotr, et al. (författare)
  • On the Bose-Einstein Condensation of Exotic Atoms
  • 2006
  • Ingår i: Journal of Physics B. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 39:18, s. 3889-3895
  • Tidskriftsartikel (refereegranskat)abstract
    • The scattering length for hydrogenic atoms with variable lepton mass, ranging from H to p mu, is calculated. The non-trivial sensitivity of the scattering length to non-adiabatic effects is investigated using the coupled-channel approach. The physical conditions for the Bose-Einstein condensation of exotic atoms are expressed in terms of this scattering length, which for the p mu atoms interacting via (3)Sigma(+)(u) potentials, is calculated to be 1.13 x 10(-2) au. The critical temperature for condensing the p mu atoms is estimated to be 0.5 K at a density of 2.2 x 10(20) cm(-3). Under these conditions the phonon velocity in the condensate is 2.2 m s(-1) and the coherence length is nearly 5 mu m.
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57.
  • Husson, A., et al. (författare)
  • A pulsed high-voltage decelerator system to deliver low-energy antiprotons
  • 2021
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 1002
  • Tidskriftsartikel (refereegranskat)abstract
    • The GBAR (Gravitational Behavior of Antihydrogen at Rest) experiment at CERN requires efficient deceleration of 100 keV antiprotons provided by the new ELENA synchrotron ring to synthesize antihydrogen. This is accomplished using electrostatic deceleration optics and a drift tube that is designed to switch from -99 kV to ground when the antiproton bunch is inside – essentially a charged particle “elevator” – producing a 1 keV pulse. We describe the simulation, design, construction and successful testing of the decelerator device at -92 kV on-line with antiprotons from ELENA.
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58.
  • Jonsell, Svante, et al. (författare)
  • A nonadiabatic semi-classical method for dynamics of atoms in optical lattices
  • 2006
  • Ingår i: European Physical Journal D. - Les Ulis : EDP Sciences. - 1434-6060 .- 1434-6079. ; 39:1, s. 67-74
  • Tidskriftsartikel (refereegranskat)abstract
    • We develop a semi-classical method to simulate the motion of atoms in a dissipative optical lattice. Our method treats the internal states of the atom quantum mechanically, including all nonadiabatic couplings, while position and momentum are treated as classical variables. We test our method in the one-dimensional case. Excellent agreement with fully quantum mechanical simulations is found. Our results are much more accurate than those of earlier semi-classical methods based on the adiabatic approximation.
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59.
  • Jonsell, Svante (författare)
  • Collisions involving antiprotons and antihydrogen : an overview
  • 2018
  • Ingår i: Philosophical Transactions. Series A. - : The Royal Society. - 1364-503X .- 1471-2962. ; 376:2116
  • Forskningsöversikt (refereegranskat)abstract
    • I give an overview of experimental and theoretical results for antiproton and antihydrogen scattering with atoms and molecules (in particular H, He). At low energies (less than or similar to 1 keV) there are practically no experimental data available. Instead I compare the results from different theoretical calculations, of various degrees of sophistication. At energies up to a few tens of eV, I focus on simple approximations that give reasonably accurate results, as these allow quick estimates of collision rates without embarking on a research project. This article is part of the Theo Murphy meeting issue 'Antiproton physics in the ELENA era'.
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  • Resultat 51-60 av 116
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Charlton, M. (37)
van der Werf, D. P. (35)
Froelich, Piotr (30)
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