However, because of the details of how nucleosynthesis works, 56Fe is a more common endpoint of fusion chains inside extremely massive stars and is therefore more common in the universe, relative to other metals, including 62Ni, 58Fe and 60Ni, all of which have a very high binding energy. The isotope 56Fe is the isotope with the lowest mass per nucleon, 930.412 MeV/c 2, though not the isotope with the highest nuclear binding energy per nucleon, which is nickel-62. ĥ4Fe is observationally stable, but theoretically can decay to 54Cr, with a half-life of more than 4.4 ×10 20 years via double electron capture ( εε). The one standard deviation errors are given in parentheses after the corresponding last digits. Atomic masses of the stable nuclides ( 54Fe, 56Fe, 57Fe, and 58Fe) are given by the AME2012 atomic mass evaluation.^ Lowest mass per nucleon of all nuclides End product of stellar nucleosynthesis.^ Believed to decay by β +β + to 54Cr with a half-life of over 4.4×10 20 a.^ ( ) spin value – Indicates spin with weak assignment arguments.^ Bold symbol as daughter – Daughter product is stable.^ a b # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
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