Delayed beta- and gamma-ray production due to thermal-neutron fission of /sup 239/Pu: tabular and graphical spectral distributions for times after fission between 2 and 14000 sec

Fission-product decay energy-release rates were measured for thermal-neutron fission of /sup 239/Pu. Samples of mass 1 and 5 ..mu..g were irradiated for 1 to 100 s using the fast pneumatic-tube facility at the Oak Ridge Research Reactor. The resulting beta- and gamma-ray emissions were separately counted for times-after-fission between 2 and 14,000 s to yield spectral distributions N(E/sub ..gamma../) vs E/sub ..gamma../ and N(E/sub ..beta../) vs E/sub ..beta../. The gamma-ray spectra were obtained by use of a NaI detector, and the beta-ray spectra were obtained by use of an NE-110 detector with an anticoincidence mantle. The raw data were unfolded to provide spectral distributions of moderate resolution. These distributions are given in graphical and tabular form as differential spectral intensity I(E) (MeV/sup -1/ fission/sup -1/) averaged over gamma-ray energy intervals ranging from 10 keV for E/sub ..gamma../ 6.8 MeV, and beta-ray energy intervals ranging from 20 keV for E/sub ..beta../ 6.4 MeV. Counting-time intervals ranged from 1 s for times-after-fission (t/sub w/) < 6 s to 4000 s for t/sub w/ approx. 10/sup 4/ s. For comparisons the graphical representationsmore » show calculated spectra obtained by use of the CINDER-10 summation code and the ENDF/B-IV fission yield and decay scheme data base. 90 figures, 86 tables.« less