ion55Parent Nuclides. Direct parent isotope is: 55 Co. Formation. 55 Fe can be artificially produced by neutron irradiation of stable iron isotopes: 54 Fe(n,γ) 55 Fe or 56 Fe(n,2n) 55 Fe. Accordingly, iron-containing components such as steelAccess to your entire IONOS world: contracts, products, and customer data, order or change services - now password-protected .