Dimensional estimates suggest that nuclei with mass number above 10^7 and near-maximal isospin could be metastable, decay by neutron evaporation, and possibly form in neutron star mergers.
Negative energy effects in processes involving bound particles: finite nuclear size effects
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abstract
Probability of finding negative energy states in a hydrogen atom is decreased when the nucleus is extended. Reduced electron Compton wavelength is the characteristic size of the region around the nucleus where negative energy contributions to the wave function are sizeable.
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Monsters and neutron stars
Dimensional estimates suggest that nuclei with mass number above 10^7 and near-maximal isospin could be metastable, decay by neutron evaporation, and possibly form in neutron star mergers.