In collisions between nuclei, a proton or neutron might be knocked out of one nucleus. Now, two-proton knockout has been demonstrated, opening a new route to the creation of neutron-rich systems for study.
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Warner, D. It's a knockout. Nature 425, 570–571 (2003). https://doi.org/10.1038/425570a
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DOI: https://doi.org/10.1038/425570a
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