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  • Other Sources  (2)
  • Astronomy  (1)
  • PHYSICS, SOLID-STATE  (1)
  • 1
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    The observation of damage regions produced by neutron irradiation in lithium-doped silicon solar cells. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Study regions of lattice disorder produced in lithium-doped float-zone melted n/p-type silicon solar cells by irradiation with monoenergetic neutrons at doses between 10 to the 10th and 10 to the 13th per cu cm. The defect regions were revealed by chemically etching the surface of the solar cells and by observing carbon replicas in an electron microscope. It was found that the defect density increased with increasing irradiation dose and increased lithium content, whereas the average defect diameter was found to decrease. From thermal annealing experiments it was found that in the lithium-doped material the defect structure was stable at temperatures between 300 and 1200 K. This was found to be in contrast to the undoped material where at the lowest doses considerable annealing was observed to occur. These results are discussed in terms of the theoretical predictions and models of defect clusters proposed by Gossick (1959) and Crawford and Cleland (1959).
    Keywords: PHYSICS, SOLID-STATE
    Type: Journal of Materials Science; 7; Feb. 197
    Format: text
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  • 2
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    Illuminating Gravitational Waves: A Concordant Picture of Photons from a Neutron Star Merger (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Merging neutron stars offer an excellent laboratory for simultaneously studying strong-field gravity and matter in extreme environments. We establish the physical association of an electromagnetic counterpart (EM170817) with gravitational waves (GW170817) detected from merging neutron stars. By synthesizing a panchromatic data set, we demonstrate that merging neutron stars are a long-sought production site forging heavy elements by r-process nucleosynthesis. The weak gamma rays seen in EM170817 are dissimilar to classical short gamma-ray bursts with ultrarelativistic jets. Instead, we suggest that breakout of a wide-angle, mildly relativistic cocoon engulfing the jet explains the low-luminosity gamma rays, the high-luminosity ultraviolet-optical-infrared, and the delayed radio and x-ray emission. We posit that all neutron star mergers may lead to a wide-angle cocoon breakout, sometimes accompanied by a successful jet and sometimes by a choked jet.
    Keywords: Astronomy
    Type: GSFC-E-DAA-TN53451 , Science (ISSN 0036-8075) (e-ISSN 1095-9203); 358; 6370; 1559-1565
    Format: application/pdf
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