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Author : George Robert Keepin
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.3/5 (91 download)
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 The Delayed Neutron Precursors in Fission written by and published by . This book was released on 1958 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A survey of the experimental data on delayed neutron half lives and yields gives indication for the existence of a greater number of delayed neutron precursors than the six commonly accepted. This finds further support in the fact that the ratio of delayed neutron yield to cumulative fission yield of a delayed neutron precursor depends on the fissioning nuclide when computed from observed data. By means of a semitheoretica1 approach based on systemitics of [beta]-decay energies, highly improved mass formulas, and theory for delayed neutron emission, the probability for delayed neutron emission is estimited. From this approach the distribution of delayed neutron precursors in a N, Z diagram is obtained. By coupling with known fission mass and charge-distribution curves the maximum possible number of delayed neutron precursors in thermal and low-energy fission is estimated to be in the vicinity of 50. Of the possible delayed neutron precursors about two thirds are odd Z nuclides and one third even Z nuclides. Of the elements concerned the largest amount of delayed neutron precursors is expected to be isotopes of bromine and iodine. (auth).
Author : Michaele Clarice Brady
Publisher :
ISBN 13 :
Total Pages : 564 pages
Book Rating : 4.:/5 (27 download)
Download or read book Evaluation and Application of Delayed Neutron Precursor Data written by Michaele Clarice Brady and published by . This book was released on 1988 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Evaluated Fission-product Delayed-neutron Precursor Data in Reactor Kinetics Calculations written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluated fission-product yield and decay data have been used to describe 105 delayed neutron precursors explicitly in point reactor kinetics calculations. Results calculated for 235U thermal fission show that rod-drop reactivity values obtained from kinetics calculations with 6-group precursor data are considerably higher than those calculated with explicit delayed-neutron precursor data. The calculated kinetics associated with positive reactivity steps are significantly different.
Author :
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.3/5 (91 download)
Download or read book Energies of the Delayed Neutrons from U235 Fission Products written by and published by . This book was released on 1946 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : International Atomic Energy Agency
Publisher :
ISBN 13 :
Total Pages : 268 pages
Book Rating : 4.3/5 (91 download)
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:
Author : George Robert Keepin
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.3/5 (91 download)
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.
Author :
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (684 download)
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.
Author : N. Sugarman
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.3/5 (91 download)
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 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluated Delayed Neutron Precursor Data written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on energetics, approx. 270 fission products should be delayed neutron precursors. Of these, approx. 85 have measured and evaluated emission probabilities (Pn's) and approx. 34 have measured spectra data; the latter account for 80% or more of the total anti .nu./sub d/. Although the measurements are probably adequate for most reactor applications, complete data sets are needed for ENDF/B and for fission product yield evaluations. This paper briefly describes the use of systematics and nuclear models used to produce a complete set of data for 272 precursors and presents aggregate summation calculations needed to produce the conventional six time-group approximations. 10 refs., 2 figs.
Author :
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (727 download)
Download or read book Technique for the Identification of Dominant Delayed Neutron Precursors written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: A technique for the identification of delayed neutron precursors has been developed based on the product of cumulative yield and probability of neutron emission. The motivation behind this work is to fix the decay constants of delayed neutrons to those of the dominant delayed neutron precursors. The desirability of identifying a single set of decay constants that would apply to all fissionable isotopes and be independent of the neutron energy spectrum has been addressed by several authors. The main advantages of a fixed-decay constant representation are simplifying the analysis of epithemal and fast reactors with multiple fissioning isotopes, and improving the fit to experimental data while preserving the inferred positive reactivity scale associated with the original six-group representation. It is well known that 27 1 delayed neutron precursors exist, but only a select number of those precursors contribute significantly to the decay of delayed neutron. Using data compiled by England and Rider, which lists fission yield and probability of neutron emission values for the 27 1 known delayed neutron precursors in 32 fissioning systems, thirteen precursors were identified that are consistently dominant for alI fissioning systems.
Author : F. F. Dyer
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.3/5 (91 download)
Download or read book A Comprehensive Study of the Neutron Activation Analysis of Uranium by Delayed-neutron Counting written by F. F. Dyer and published by . This book was released on 1962 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. Patzelt
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (754 download)
Download or read book Comparison of Observed Delayed-neutron Abundances with Calculated Fission Yields of Neutron Precursors written by P. Patzelt and published by . This book was released on 1967 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Courtney Earl Apperson
Publisher :
ISBN 13 :
Total Pages : 358 pages
Book Rating : 4.:/5 (926 download)
Download or read book Influence of Fission Product Transport on Delayed Neutron Precursors and Decay Heat Sources in LMFBR Accidents written by Courtney Earl Apperson and published by . This book was released on 1981 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.3/5 (91 download)
Download or read book Studies of the Delayed Neutrons written by and published by . This book was released on 1947 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James D. Heckelman
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (317 download)
Download or read book An Improved Delayed Neutron Fission Product Monitor written by James D. Heckelman and published by . This book was released on 1969 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stanley Vincent Paulauskas
Publisher :
ISBN 13 :
Total Pages : 104 pages
Book Rating : 4.:/5 (126 download)
Download or read book Beta-delayed Neutron Spectroscopy of Fission Fragments Using the Versatile Array of Neutron Detectors at Low Energy written by Stanley Vincent Paulauskas and published by . This book was released on 2013 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work details the study of nuclear decay in the region of doubly magic 78Ni using the Versatile Array of Neutron Detectors at Low Energy (VANDLE). This detector system uses the time-of-flight technique to measure the energy of beta-delayed neutrons. VANDLE uses a fully digital data acquisition system equipped with timing algorithms developed as part of the experimental work. The experiment examined nearly 30 beta-delayed neutron precursors produced at the Hollifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. This work discusses three of these nuclei: 77,78Cu and 84Ga. Results from the experiment provide details of the Gamow-Teller decay in neutron rich nuclei near 78Ni.
