Author:
Publisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 34
Book Description
Energies of the Delayed Neutrons from U235 Fission Products
An Investigation of the Delayed Neutron Decay Curves Resulting from Uranium and Plutonium Fission
Author: C. Redman
Publisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 20
Book Description
Publisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 20
Book Description
Delayed Fission Neutrons
Author: International Atomic Energy Agency
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 272
Book Description
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 272
Book Description
Delayed Neutrons from Fissionable Isotopes of Uranium, Plutonium, and Thorium
Author: George Robert Keepin
Publisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 58
Book Description
Publisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 58
Book Description
Measurements of Delayed Neutron Parameters for U-235 and Np-237
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
Book Description
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.
Early Time Decay of Fission Product Mixtures
Author: J. L. Mackin
Publisher:
ISBN:
Category : Fission products
Languages : en
Pages : 32
Book Description
Publisher:
ISBN:
Category : Fission products
Languages : en
Pages : 32
Book Description
Delayed Neutrons from U235 After Short Irradiation
Delayed Neutrons
Author: George Robert Keepin
Publisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 56
Book Description
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.
Publisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 56
Book Description
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.
The Determination of the Ranges of the Fission Fragments Emitting Delayed Neutrons Chemical Identification of the 4.51s Delayed Neutron Activity
Author: N. Sugarman
Publisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 4
Book Description
Publisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 4
Book Description