. . "http://en.wikipedia.org/wiki/Fission_product_yield"^^ . . "\\(\\eta\\)"^^ . "http://www.iso.org/iso/catalogue_detail?csnumber=31895"^^ . "Neutron Yield per Absorption"@en . . "The \"Neutron Yield per Absorption\" is the average number of fission neutrons, both prompt and delayed, emitted per neutron absorbed in a fissionable nuclide or in a nuclear fuel, as specified." .