Researchers at Lawrence Livermore National Laboratory have generated billions of positrons, forming the highest antimatter densities ever created on earth, by using superintense short laser pulses.
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Müller, C., Keitel, C. Abundant positron production. Nature Photon 3, 245–246 (2009). https://doi.org/10.1038/nphoton.2009.56
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DOI: https://doi.org/10.1038/nphoton.2009.56
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