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Träfflista för sökning "hsv:(NATURVETENSKAP) hsv:(Fysik) hsv:(Astronomi astrofysik och kosmologi) srt2:(1990-1999)"

Sökning: hsv:(NATURVETENSKAP) hsv:(Fysik) hsv:(Astronomi astrofysik och kosmologi) > (1990-1999)

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1.
  • Apostolakis, A, et al. (författare)
  • A determination of the CP violation parameter η+- from the decay of strangeness-tagged neutral kaons
  • 1999
  • Ingår i: Physics Letters B. - : Elsevier. - 0370-2693 .- 1873-2445. ; 458:4, s. 545-552
  • Tidskriftsartikel (refereegranskat)abstract
    • LEAR offered unique opportunities to study the symmetries which exist between matter and antimatter. At variance with other approaches at this facility, CPLEAR was an experiment devoted to the study of CP, T and CPT symmetries in the neutral-kaon system. A variety of measurements allowed us to determine with high precision the parameters which describe the time evolution of the neutral kaons and their antiparticles, including decay amplitudes, and the related symmetry properties. Limits concerning quantum-mechanical predictions (EPR, coherence of the wave function) or the equivalence principle of general relativity have been obtained. An account of the main features of the experiment and its performances is given here, together with the results achieved.
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2.
  • Beideck, DJ, et al. (författare)
  • Lifetimes of 5d96p and 5d86s6p levels in Hg iii
  • 1993
  • Ingår i: Physical Review A (Atomic, Molecular and Optical Physics). - 1050-2947. ; 47:2, s. 884-889
  • Tidskriftsartikel (refereegranskat)abstract
    • Experimental and theoretical studies of lifetimes and transition probabilities for doubly ionized mercury, Hg III, are reported. Such data are currently of great astrophysical interest because observations with the Goddard high resolution spectrograph on board the Hubble space telescope have shown some 5d(9)6s-5d(9)6p transitions of Hg III in the spectrum of the chemically peculiar star chi Lupi. We now report experimental lifetimes for some selected 5d(9)6p and 5d(8)6s6p levels, determined by beam-foil spectroscopy, and compare the results with theoretical transition probabilities based on relativistic multiconfiguration Dirac-Fock calculations.
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5.
  • Mock, P. C., et al. (författare)
  • Status and capabilities of AMANDA-94
  • 1995
  • Ingår i: Proceedings, 24th International Conference, Rome, Italy, August 28-September 8, 1995.
  • Konferensbidrag (refereegranskat)
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8.
  • Fälthammar, Carl-Gunne (författare)
  • Alfvén, Hannes
  • 1995
  • Ingår i: Physics today. - 0031-9228 .- 1945-0699. ; 48, s. 118-119
  • Tidskriftsartikel (refereegranskat)
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9.
  • Fälthammar, Carl-Gunne (författare)
  • In memoriam Hannes Alfven - (1908-1995)
  • 1995
  • Ingår i: Astrophysics and Space Science. - 0004-640X .- 1572-946X. ; 234, s. 173-175
  • Tidskriftsartikel (refereegranskat)
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10.
  • Fälthammar, Carl-Gunne, et al. (författare)
  • Magnetosphere-ionosphere interactions as a key to the plasma Univers
  • 1995
  • Ingår i: IEEE Transactions on Plasma Science. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-3813 .- 1939-9375. ; 23, s. 2-9
  • Tidskriftsartikel (refereegranskat)abstract
    • Almost all known matter in the universe is in a state, the plasma state, that is rare on Earth, and whose physical properties are still incompletely understood. Its complexity is such that a reliable understanding must build on empirical knowledge. While laboratory experiments are still an important source of such knowledge, Earth’s magnetospere-ionosphere system, made accessible by space technology, vastly widens the parameter ranges in which plasma phenomena can be studied. This system contains all three main categories of plasma present in the universe. Furthermore, the interaction between the magnetosphere and the ionosphere excites a wealth of plasma physical phenomena of fundamental importance. These include, among others, formation of magnetic-field aligned electric fields, acceleration of charged particles, release of magnetically stored energy, formation of filamentary and cellular structures, as well as unexpected chemical separation processes. What has been learned, and what stilt remains to be learned, from study of the magnetosphere-ionosphere system should therefore provide a much improved basis for understanding of our universe.
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