Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the Coulomb barrier.
作者： I Ahmad , SM Austin , BB Back , RR Betts , FP Calaprice
DOI: 10.1103/PHYSREVLETT.75.2658
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摘要: The first results are presented from a new experiment, APEX, designed to study the previously reported sharp lines in sum-energy spectra of positrons and electrons produced collisions very heavy ions. Data were collected for {sup 238}U+{sup 181}Ta at 5.95, 6.10, 6.30 MeV/u 232}Th 5.95 MeV/u. In none our analyses is any evidence found lines. For specific case isolated decay neutral particle mass 1.4--2.1 MeV/{ital c}{sup 2}, upper limits on cross sections obtained present data significantly less than sections.
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