Nuclear binding energy per nucleon of common isotopes; iron-56 labelled at the curve's crest. The rarer isotopes nickel-62 and iron-58, which both have higher binding energies, are not shown.
Of all nuclides, iron-56 has the lowest mass per nucleon. With 8.8 MeVbinding energy per nucleon, iron-56 is one of the most tightly bound nuclei.[1]
Nickel-62, a relatively rare isotope of nickel, has a higher nuclear binding energy per nucleon; this is consistent with having a higher mass-per-nucleon because nickel-62 has a greater proportion of neutrons, which are slightly more massive than protons. (See the nickel-62 article for more). Light elements undergoing nuclear fusion and heavy elements undergoing nuclear fission release energy as their nucleons bind more tightly, so 62Ni might be expected to be common. However, during nucleosynthesis in stars the competition between photodisintegration and alpha capturing causes more 56Ni to be produced than 62Ni (56Fe is produced later in the star's ejection shell as 56Ni decays).
Production of these elements has decreased considerably from what it was at the beginning of the stelliferous era.[citation needed]
Nonetheless, 28 atoms of nickel-62 fusing into 31 atoms of iron-56 releases 0.011 u of energy. As the Universe ages, matter will slowly convert to ever more tightly bound nuclei, approaching 56Fe, ultimately leading to the formation of iron stars over ≈101500 years in an expanding universe without proton decay.[2]
^Dyson, Freeman J. (1979). "Time without end: Physics and biology in an open universe". Reviews of Modern Physics. 51 (3): 447–460. Bibcode:1979RvMP...51..447D. doi:10.1103/RevModPhys.51.447.
de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
iron, 56fe, most, common, isotope, iron, about, iron, iron, 56fegeneralsymbol56fenamesiron, 56protons, 26neutrons, 30nuclide, datanatural, abundance91, isotope, mass55, 9349375, daspin0, excess, energy, 60601, kevbinding, energy492253, kevisotopes, iron, compl. Iron 56 56Fe is the most common isotope of iron About 91 754 of all iron is iron 56 Iron 56 56FeGeneralSymbol56FeNamesiron 56 Fe 56Protons Z 26Neutrons N 30Nuclide dataNatural abundance91 754 Isotope mass55 9349375 7 DaSpin0 Excess energy 60601 003 1 354 keVBinding energy492253 892 1 356 keVIsotopes of iron Complete table of nuclidesNuclear binding energy per nucleon of common isotopes iron 56 labelled at the curve s crest The rarer isotopes nickel 62 and iron 58 which both have higher binding energies are not shown Of all nuclides iron 56 has the lowest mass per nucleon With 8 8 MeV binding energy per nucleon iron 56 is one of the most tightly bound nuclei 1 Nickel 62 a relatively rare isotope of nickel has a higher nuclear binding energy per nucleon this is consistent with having a higher mass per nucleon because nickel 62 has a greater proportion of neutrons which are slightly more massive than protons See the nickel 62 article for more Light elements undergoing nuclear fusion and heavy elements undergoing nuclear fission release energy as their nucleons bind more tightly so 62Ni might be expected to be common However during nucleosynthesis in stars the competition between photodisintegration and alpha capturing causes more 56Ni to be produced than 62Ni 56Fe is produced later in the star s ejection shell as 56Ni decays Production of these elements has decreased considerably from what it was at the beginning of the stelliferous era citation needed Nonetheless 28 atoms of nickel 62 fusing into 31 atoms of iron 56 releases 0 011 u of energy As the Universe ages matter will slowly convert to ever more tightly bound nuclei approaching 56Fe ultimately leading to the formation of iron stars over 101500 years in an expanding universe without proton decay 2 See also EditIsotopes of iron Iron starReferences Edit Nuclear Binding Energy Dyson Freeman J 1979 Time without end Physics and biology in an open universe Reviews of Modern Physics 51 3 447 460 Bibcode 1979RvMP 51 447D doi 10 1103 RevModPhys 51 447 de Laeter John Robert Bohlke John Karl De Bievre Paul Hidaka Hiroshi Peiser H Steffen Rosman Kevin J R Taylor Philip D P 2003 Atomic weights of the elements Review 2000 IUPAC Technical Report Pure and Applied Chemistry 75 6 683 800 doi 10 1351 pac200375060683 Lighter iron 55 Iron 56 is an isotope of iron Heavier iron 57Decay product of manganese 56cobalt 56 Decay chain of iron 56 Decays to Stable Retrieved from https en wikipedia org w index php title Iron 56 amp oldid 1075734983, wikipedia, wiki, book, books, library,
