<sod>New research has dramatically increased the quantity of positrons that experimentalists can produce. Physicists at the [[Lawrence Livermore National Laboratory]] in California have used a short, ultra-intense laser to irradiate a millimetre-thick gold target and produce more than 100 billion positrons.<ref><eod>
<sod>Physicists at the [[Lawrence Livermore National Laboratory]] in California have used a short, ultra-intense laser to irradiate a millimetre-thick gold target and produce more than 100 billion positrons.<ref><eod>