Before revision: Delayed Neutron Data for Thermal Fission in U-235Lamarsh, Introduction to Nuclear Engineering Group Half-Life(s) Decay Constant(s−1) Energy(keV) Fraction Yield of delayed neutrons of all fissions of this group 1 55.72 0.0124 250 0.000 215 0.000 52 2.4 2 22.72 0.0305 560 0.001 424 0.005 46 3.8 3 6.22 0.111 405 0.001 274 0.003 10 2.4 4 2.30 0.301 450 0.002 568 0.006 24 2.4 5 0.614 1.14 - 0.000 748 0.001 82 2.4 6 0.230 3.01 - 0.000 273 0.000 66 2.4 Sum 0.006 5 0.017 8 2.7 Importance in nuclear fission basic research The standard deviation of the final kinetic energy distribution as a function of mass of final fragments from low energy fission of uranium 234 and uranium 236, presents a peak around light fragment masses region and another on heavy fragment masses region.
After revision: Delayed Neutron Data for Thermal Fission in U-235Lamarsh, Introduction to Nuclear URL Group Half-Life(s) Decay Constant(s−1) Energy(keV) Fraction Yield of delayed neutrons of all fissions of this group 1 55.72 0.0124 250 0.000 215 0.000 52 2.4 2 22.72 0.0305 560 0.001 424 0.003 46 2.4 3 6.22 0.111 405 0.001 274 0.003 10 2.4 4 2.30 0.301 450 0.002 568 0.006 24 2.4 5 0.614 1.14 - 0.000 748 0.001 82 2.4 6 0.230 3.01 - 0.000 273 0.000 66 2.4 Sum 0.006 5 0.015 8 2.4 Importance in nuclear fission basic research The standard deviation of the final kinetic energy distribution as a function of mass of final fragments from low energy fission of uranium 234 and uranium 236, presents a peak around light fragment masses region and another on heavy fragment masses region.