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High-energy nuclear collisions create an energy density similar to that of the Universe microseconds after the Big Bang; in both cases, matter and antimatter are formed with comparable abundance. However, the relatively short-lived expansion in nuclear collisions allows antimatter to decouple quickly from matter, and avoid annihilation. Thus, a high-energy accelerator of heavy nuclei provides an efficient means of producing and studying antimatter.
View Article and Find Full Text PDFRole of the Dirac sea in the quenching of Gamow-Teller strength.
Phys Rev Lett
August 2003
Department of Physics, Faculty of Science, Chiba University, Chiba 263-8522, Japan.
The issue of the Gamow-Teller sum rule in atomic nuclei is reexamined in the framework of a relativistic description of nuclei. It is shown that the total Gamow-Teller strength in the nucleon sector is reduced by about 12% as compared to the prediction of a nonrelativistic description. This reduction is due to the antinucleon degrees of freedom.
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