Download or read book Absolute yields and group constants of delayed neutrons in fast fission written by Peter Tavoularidis and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Delayed Neutrons from Fissionable Isotopes of Uranium Plutonium and Thorium written by George Robert Keepin and published by . This book was released on 1957 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Few Group Constants for Delayed Neutrons written by Lionel Friedman and published by . This book was released on 1956 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Delayed Neutron Parameters for U 235 and Np 237 written by and published by . This book was released on 1997 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Delayed neutrons are emitted by excited nuclei formed in beta decay of fission products called delayed neutron precursors. About 1% of the total neutrons released in fission are delayed neutrons; however, this small fraction plays an important role in nuclear reactor control. The delayed neutrons determine the time-dependent behavior of reactors, and knowledge of parameters used to predict neutron emission rate is essential for establishing reactivity worths. The delayed neutron yields, decay constants, and the absolute yield for the six-group delayed neutrons have been measured for U-235 and Np-237. This experiment has been called for in the forecast of experiments needed to support operations in the US. The bare U-235 metal assembly Godiva IV at the Los Alamos Critical Experiment Facility (LACEF) provided the source of neutrons. Godiva IV generated about 107 total fissions in the samples for the infinite and instantaneous irradiation needed to accentuate the shorter and longer-lived groups of delayed neutrons. The detection system used in the experiment consisted of 20 He-3 tubes embedded in a polyethylene cylinder. The delayed neutron activity resulting from the fast neutron-induced fission has been measured. The measured absolute yield for U-235 was determined to be 0.0163 " 0.009 neutrons/fission. This value compares very well with the well-established Keepin absolute yield of 0.0165 " 0.0005. The newly measured absolute yield value for Np-237 was 0.0126 " 0.0007, which compares well to the recently reported value of 0.0129 " 0.0004 by Saleh and Parish. The measured values for U-235 are corroborated with period (e-folding time) versus reactivity calculations.
Download or read book Reduced Delayed Neutron Group Representations written by R. E. Skinner and published by . This book was released on 1959 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Absolute yields of delayed neutrons in the fast fission of U 235 and U 238 written by Derek Alan Clifford and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reactor Physics Constants written by Reactor Physics Constants Center (U.S.) and published by . This book was released on 1963 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Delayed Neutron Reduced Groups by Least Squares written by Thomas E. Springer and published by . This book was released on 1964 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Treatment of Fission Yield Effects and Method Development for Improved Reactor Depletion Calculations written by Kern, Kilian and published by KIT Scientific Publishing. This book was released on 2019-03-01 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Delayed Neutrons written by George Robert Keepin and published by . This book was released on 1955 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review is given of existing measurements as of October 1955 on the properties of delayed neutrons from various fissionable isotopes. The relation of these measurements to current theory and practice is discussed.
Download or read book Measurement of the Absolute Yield of Delayed Neutrons from the Fast Neutron Induced Fission of Uranium 235 and 238 written by Mark Adrian Kellett and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Obdachlosigkeit written by and published by . This book was released on 1971 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Delayed Fission Neutrons written by International Atomic Energy Agency and published by . This book was released on 1968 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Determination of the Ranges of the Fission Fragments Emitting Delayed Neutrons Chemical Identification of the 4 51s Delayed Neutron Activity written by N. Sugarman and published by . This book was released on 1946 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observations Regarding Fixed Decay Constants on the Reactivity Prediction for the Fast Fission of U 235 written by and published by . This book was released on 1997 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Delayed neutron precursors have traditionally been represented by six groups. The group yields and decay constants are obtained from nonlinear fits to delayed neutron emission rates obtained experimentally. Each fit to the data produces different set of group decay constants based on the statistical precision of the instruments used and on the time domain used. As a result, standard data libraries contain different sets of group decay constants for each fissionable nuclide based on the nonlinear least squares fit. The group decay constants for thermal and fast fission of the same fissile nuclide are also different. The advantages of using a single set of decay constants for all isotopes facilitate the analysis to cores that have different type of fissionable materials. This and other advantages have been discussed by several authors. Cahalan and Ott, 1973 developed six group formulations with fixed decay constants for fast fission of 8 different nuclide. A simpler transformation is used in this work to demonstrate that fixed decay constant formulations can easily be developed and differences in reactivity introduced by the transformation are very small. The seven decay constants used for this demonstration are not optimal or recommended in any sense. The selection of a fixed set of decay constants that could be used for all fissionable nuclides and neutron energies appears feasible and is under study, but it is well beyond the scope of this abstract.
Download or read book Delayed Neutron Data written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: BS>The status of delayed neutron measurements is reviewed. Emphasis is placed on the absolute yield va the energy of the neutrons cauging fission, group yields and periods, and in the delayed neutron spectra. Systematics are discussed; and an evaluated data set, based both on available measurements and on systematics arguments, is suggested for inclusion in ENDF/B-IV. Areas of delayed neutron studies which require additional measurements are outlined. (18 figures, 18 tables) (auth).
Download or read book Grande exposition de photographies l occasion du 800 me anniversaire de Tramelan written by and published by . This book was released on 1978 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
