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Träfflista för sökning "hsv:(NATURVETENSKAP) hsv:(Fysik) hsv:(Subatomär fysik) srt2:(1970-1979)"

Sökning: hsv:(NATURVETENSKAP) hsv:(Fysik) hsv:(Subatomär fysik) > (1970-1979)

  • Resultat 1-10 av 71
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1.
  • Andersson, B., et al. (författare)
  • The relationship between the meson, baryon, photon and quark fragmentation distributions
  • 1977
  • Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693. ; 69:2, s. 221-224
  • Tidskriftsartikel (refereegranskat)abstract
    • The ideas presented in an earlier note on the relationship between the quark fragmentation distributions as measured in leptoproduction and the one particle distributions in the mesonic fragmentation regions of hadronic interactions are carried further to photoproduction and to the baryon fragmentation distributions. The results are as before interpreted in terms of a simple additive quark model where the main interaction is due to the wee partons whereas almost all the initial momentum is carried by one of the valence quarks or a diquark.
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  • Andersson, B., et al. (författare)
  • A statistical model for quark fragmentation into mesons with emphasis on vector meson contributions
  • 1978
  • Ingår i: Nuclear Physics, Section B. - : Elsevier BV. - 0550-3213. ; 135:2, s. 273-284
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper is the first part of a program to deal with the relative importance of the different effects in a colour dipole field when the field energy is transformed into hadrons according to a statistical scheme with the sole constraints coming from energy and momentum conservation and the requirements of scaling. In this paper we treat the meson distributions from quark fragmentation with particular emphasis on the importance of a vector meson production of the size observed at present. We neglect diquark formation and the baryon distributions as a first approximation. The simplicity of the approach will make it possible to easily understand the size and the shape of the different contributions.
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4.
  • Andersson, Bo, et al. (författare)
  • Implications of a large vector meson production on quark jet fragmentation and large p T reactions
  • 1978
  • Ingår i: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 18:4, s. 193-195
  • Tidskriftsartikel (refereegranskat)abstract
    • A large vector meson production in quark jet fragmentation implies characteristic differences between the kaon and pion spectra. This prediction is verified in a recent SLAC-MIT experiment. Similar considerations are relevant for the c-quark fragmentation into D-mesons, as observed in ν scattering experiments.The difference in kaon and pion spectra provides a test of the hard quark-quark scattering description of large p T events. In particular the K+/π+ ratio (∼ 1/2 for single particle triggers) should be around 0.1-0.2 for jet triggers.
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10.
  • Ahlberg, Mats, et al. (författare)
  • Proton-Induced X-Ray Analysis of Steel Surfaces for Microprobe Purposes
  • 1975
  • Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - 0167-5087. ; 123:2, s. 385-393
  • Tidskriftsartikel (refereegranskat)abstract
    • A study of the detection limits for the elements with Z = 15-92 in thick target steel surfaces using proton-induced X-ray technique has been performed. Samples were irradiated with a broad proton beam of 2 mm diameter and the X-rays were detected by a Si(Li) detector. Detection limits at levels down to the order of 10 ppm were achieved with simultaneous measurement of several elements. Mylar and chromium absorbers were introduced in front of the semiconductor detector and irradiations at two different proton energies (1.0 and 2.5 MeV) were carried out in order to elucidate their effects on detection limits. The results are valid for microbeam analysis.
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