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The total gamma and beta energy release rates following a fission burst are reported from using ENDF/B-IV data in summation calculations. Results are given for fission at neutron spectrum energies of $sup 235$U and $sup 239$Pu between 10$sup -1$ and 7 x 10$sup 5$ s following bursts. Fallout decay power, obtained by subtractions of the gas contribution, is reported for the same interval. (auth).
The total gamma and beta energy release rates following a fission burst are reported from using ENDF/B-IV data in summation calculations. Results are given for fission at neutron spectrum energies of 235U and 239Pu between 10−1 and 7 x 105 s following bursts. Fallout decay power, obtained by subtractions of the gas contribution, is reported for the same interval. (auth).
A helium-jet/tape-transport system is employed in the study of beta-particle and gamma-ray energy spectra of aggregate fission products as a function of time after fission. During the initial nine months of this project we have investigated the following areas: Design, assembly and characterization of a beta-particle spectrometer; Measurement of [sup 235]U(n[sub th]ff) beta spectra for delay times 0.2 s to 12,000 s; Assembly and characterization of a 5 [times] 5 Nal(Tl) gamma-ray spectrometer; Measurement of [sup 235]U(n[sub th]ff) gamma-ray spectra for delay times 0.2s to 1 5,500s; Assembly and characterization of HPGe gamma-ray spectrometer with a Nal(Tl) Compton-and-background-suppression annulus; Measurement of [sup 235]U(n [sub th], ff) high-resolution gamma-ray spectra for delay times 0.6 s to over 100,000 s; Comparison of individual gamma-line intensities with ENDF/B-VI; Adaptation to our computer of unfolding program FERDO for beta and gamma aggregate fission-product energy spectra and development of a spectrum-stripping program for analysis of HPGe gamma-ray spectra; Study of the helium-jet fission-fragment elemental transfer efficiency. This work has resulted in the publication of twelve BAPS abstracts of presentations at scientific meetings. There are currently four Ph. D. and two M.S. candidates working on dissertations associated with the project.