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Effect of oxygen aggregation processes on the recombining activity of 60° dislocations in Czochralski grown silicon (1994)

Acerboni, S. ; Pizzini, S. ; Binetti, S. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 76 (1994), S. 2703-2710

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The interaction of dislocations with light elements like oxygen and carbon presents a variety of aspects which are of basic interest for the understanding of gettering processes, as well as for a deeper knowledge of the electrical and optical properties of dislocations. We report the results of a systematic investigation of the influence of the dislocations on the segregation of oxygen and of the effect of oxygen segregation on their electrical activities. The experiments were carried out on p-type Czochralski silicon, in the 700–1100 °C temperature range. It has been shown that not only a direct oxygen-dislocation interaction occurs, but also that a competition between homogeneous and heterogeneous segregation processes occurs, which influences the overall electrical properties of the samples as well.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.357573

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Measurement of cross sections and leptonic forward-backward asymmetries at theZ pole and determination of electroweak parameters (1994)

Acciarri, M. ; Adam, A. ; Adriani, O. ; [weitere]

Springer

The European physical journal 62 (1994), S. 551-573

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ISSN: 1434-6052

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract We report on the measurement of the leptonic and hadronic cross sections and leptonic forward-backward asymmetries at theZ peak with the L3 detector at LEP. The total luminosity of 40.8 pb−1 collected in the years 1990, 1991 and 1992 corresponds to 1.09·106 hadronic and 0.98·105 leptonicZ decays observed. These data allow us to determine the electroweak parameters. From the cross sections we derive the properties of theZ boson: $$\begin{gathered} M_Z = 91195 \pm 9MeV\Gamma _{\rm Z} = 2494 \pm 10MeV \hfill \\ \Gamma _{had} = 1748 \pm 10MeV\Gamma _\ell = 83.49 \pm 0.46MeV \hfill \\ \end{gathered} $$ assuming lepton universality. We obtain an invisible width of Γinv=496.5±7.9 MeV which, in the Standard Model, corresponds to a number of light neutrino species ofN v=2.981±0.050. Using also the three leptonic forward-backward asymmetries and the average tau polarization, we determine the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons to be: $$\bar g^\ell v = - 0.0378_{ - 0.0042}^{ + 0.0045} \bar g^\ell _A = - 0.4998 \pm 0.0014.$$ Within the framework of the Standard Model, and including our measurements of the $$Z \to b\bar b$$ forward-backward asymmetry and partial decay width, we derive an effective electroweak mixing angle of $$sin^2 \bar \theta _W = 0.2326 \pm 0.0012$$ . We obtain an estimate for the strong coupling constant, αS=0.142 ± 0.013 and for the top-quark mass,m t =158 −40 +32 ±19(Higgs) GeV, where the second error arises due to the uncertainty in the Higgs-boson mass.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01574160

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