Search Results - (Author, Cooperation:F. J. Navarro)

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  1. 1
    Staff View
    Publication Date:
    2013-06-07
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Air ; Antarctic Regions ; Climate Change/*statistics & numerical data ; Computer Simulation ; Greenland ; *Ice Cover ; Snow ; Temperature ; *Uncertainty
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Marí, B. ; Hernández-Fenollosa, M. A. ; Navarro, F. J.

    [S.l.] : American Institute of Physics (AIP)
    Published 2001
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Optical absorption and positron lifetime measurements have been performed on Fe-doped semi-insulating InP single crystals irradiated with thermal neutrons in a wide dose range from 0.1 to 2.7×1017 n cm−2. Two lifetimes were found: τ1=210 ps is constant in all the irradiation range; and τ2=340 ps reaches an intensity of almost 40% at the higher fluence used. When comparing these results with those obtained on unintentionally doped InP, a large increase of the longest lifetime is observed, from 300 ps in the nondoped InP to 340 ps in the semi-insulating InP. The increase of the second lifetime in InP:Fe means that the positron traps are less attractive to positrons. These positron traps have been associated to a complex defect generated by the main neutron-originated defect, the indium vacancy, and the clusters or interstitial atoms of Fe. The optical absorption spectra show a background absorption related to Fe precipitates in as-grown InP:Fe. This background absorption disappears after neutron irradiation, suggesting the destruction of Fe precipitates by the energetic particles generated in the transmutation process of 115In. © 2001 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1343891

    Articles: DFG German National Licenses
  3. 3
    Navarro, F. J. ; Damonte, L. C. ; Marí, B. ; Ferrero, J. L.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Neutron-irradiated InP single crystals have been investigated by positron-lifetime measurements. The samples were irradiated with thermal neutrons at different fluences yielding concentrations for Sn-transmuted atoms between 2×1015 and 2×1018 cm−3. The lifetime spectra have been analyzed into one exponential decay component. The mean lifetimes show a monotonous increase with the irradiation dose from 246 to 282 ps. The increase in the lifetime has been associated to a defect containing an Indium vacancy. Thermal annealing at 550 °C reduces the lifetime until values closed to those obtained for the as-grown and conventionally doped InP crystals. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.362637

    Articles: DFG German National Licenses