Theoretical and Experimental Cross Sections for Neutron Reactions on 64Zinc

Theoretical and Experimental Cross Sections for Neutron Reactions on 64Zinc
Author:
Publisher:
Total Pages:
Release: 1988
Genre:
ISBN:

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Accurate measurements of the 64Zn (n,2n)63Zn and 64Zn (n, p)64Cu cross sections at 14.8 MeV have been made using a Texas Nuclear Neutron Generator and the activation technique. A NaI(Tl) spectrometer (using two 6'' x 6'' NaI detectors/crystals) was ued to measure the gamma radiation emitted in coincidence from the positron-emitting decay products. The measurements were made relative to 65Cu (n,2n)64Cu and 63Cu (n,2n)62Cu cross sections, which have similar half-lives, radiation emission, and were previously measured to high accuracy (2%). The value obtained for the (n,2n) measurement was 199 +- 6 millibarns, and a value of 176 +- 4.5 millibarns was obtained for the (n, p) measurement. In concert, a theoretical analysis of neutron induced reactions on 64Zn was performed at Los Alamos National Laboratory using the Hauser-Feshbach statistical theory in the GNASH code over an energy range of 100 keV to 20 MeV. Calculations included width fluctuation corrections, direct reaction contributions, and preequilibrium corrections above 6 MeV. Neutron optical model potentials were determined for zinc. The theoretical values agree with the new 14.8 MeV measurements approximately within experimental error, with calculations of 201 millibarns for the (n,2n) cross section and 170 millibarns for the (n, p) cross section. Results from the analysis will be made available in National Evaluated Nuclear Data Format (ENDF/B) for fusion energy applications. 50 refs., 34 figs., 10 tabs.

Theoretical and Experimental Cross Sections for Neutron Reactions on 64Zinc

Theoretical and Experimental Cross Sections for Neutron Reactions on 64Zinc
Author:
Publisher:
Total Pages:
Release: 1988
Genre:
ISBN:

Download Theoretical and Experimental Cross Sections for Neutron Reactions on 64Zinc Book in PDF, Epub and Kindle

Accurate measurements of the 64Zn (n,2n)63Zn and 64Zn (n, p)64Cu cross sections at 14.8 MeV have been made using a Texas Nuclear Neutron Generator and the activation technique. A NaI(Tl) spectrometer (using two 6'' x 6'' NaI detectors/crystals) was ued to measure the gamma radiation emitted in coincidence from the positron-emitting decay products. The measurements were made relative to 65Cu (n,2n)64Cu and 63Cu (n,2n)62Cu cross sections, which have similar half-lives, radiation emission, and were previously measured to high accuracy (2%). The value obtained for the (n,2n) measurement was 199 +- 6 millibarns, and a value of 176 +- 4.5 millibarns was obtained for the (n, p) measurement. In concert, a theoretical analysis of neutron induced reactions on 64Zn was performed at Los Alamos National Laboratory using the Hauser-Feshbach statistical theory in the GNASH code over an energy range of 100 keV to 20 MeV. Calculations included width fluctuation corrections, direct reaction contributions, and preequilibrium corrections above 6 MeV. Neutron optical model potentials were determined for zinc. The theoretical values agree with the new 14.8 MeV measurements approximately within experimental error, with calculations of 201 millibarns for the (n,2n) cross section and 170 millibarns for the (n, p) cross section. Results from the analysis will be made available in National Evaluated Nuclear Data Format (ENDF/B) for fusion energy applications. 50 refs., 34 figs., 10 tabs.

Neutron Cross-sections: Measurements & Evaluations

Neutron Cross-sections: Measurements & Evaluations
Author: Akm Moinul Haque Meaze
Publisher: LAP Lambert Academic Publishing
Total Pages: 152
Release: 2013
Genre:
ISBN: 9783659422164

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Neutrons are currently used across a vast extent of science. Neutron induced reaction cross-section is indispensable quantity of nuclear data, which is imperative in the applications of nuclear science and technologies. Precise resonance cross-sections are desired for the safety investigation, assessment of the neutron flux density, reaction rate, etc to drive the nuclear technologies such as nuclear power plant. Fission reaction cross-section is the key parameter for the feasibility studies and for designing next generation reactor. This book presents concrete concepts of neutron, neutron production, neutron induced reaction cross-sections, resonances and interrelated matters. Careful and detailed theoretical and contemporary experimental approaches of this text provide clear, correct, and up-to-date information in the field of neutron physics. With comprehensible discussion and numerous experimental results, this book adequately and widely covers all the major categories of neutron cross-sections.

Neutron Cross Sections

Neutron Cross Sections
Author: Donald J. Hughes
Publisher: Elsevier
Total Pages: 193
Release: 2016-01-22
Genre: Science
ISBN: 1483282759

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Neutron Cross Sections presents the principles of cross-section measurement and use, as well as sufficient theory so that the general behavior of cross sections is made understandable. This compilation is a direct result of experiences connected with the collection and evaluation of cross-section data during the past eight years at ""Sigma Centre"", Brookhaven National Laboratory. Here, experimental results received from laboratories throughout the world are carefully evaluated and compiled in the curves and tables of the large volume Neutron Cross Sections, The most recent version of the compilation, known as BNL 325, appeared 1 July 1955, and Supplement 1 to BNL 325 was published on 1 January 1957. The compilation itself consists almost completely of cross sections at specific energies, shown in the form of curves or tables, with only brief explanatory texts. The text opens with discussions of the general properties of cross sections and principles of nuclear structure that are important to the understanding of cross-section behavior. Separate chapters follow that describe specific techniques for measuring cross sections along with experimental results involving fast neutrons, resonance neutrons, resonances in fissionable materials, and thermal neutrons.

Nuclear Cross Sections for 95-Mev Neutrons

Nuclear Cross Sections for 95-Mev Neutrons
Author: James DeJuren
Publisher:
Total Pages: 24
Release: 1950
Genre: Bismuth
ISBN:

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The total cross sections of twelve different elements were measured using the neutron beam from the 184-in. cyclotron, operating with deuterons. Bismuth fission ionization chambers were employed as both monitor and detector in conventional 'good geometry' attenuation measurements in the neutron flux emerging from the 3-in. diameter collimating port in the 10-ft-thick concrete shielding. The mean energy of detection of the neutrons in this experiment is estimated to be 95 Mev. Measurements were also made with a monitor and detector placed inside the concrete shielding where an intense neutron flux over a large area could be obtained. Attenuators of four different elements were placed in front of the detector in a 'poor geometry' arrangement so that attenuation was due essentially to inelastic collisions which degrade the neutron energy below the fission threshold. A second detector was placed outside the concrete shielding In the collimated neutron beam in line with the neutron source, absorber, and first detector. Attenuation in it is caused by both inelastic and elastic scattering. By this arrangement the ratio of inelastic to total cross section can be determined directly in one experiment. The nuclear radii as calculated from the observed cross section, using the theory of the transparent nucleus, vary as 1.38 x 10(exp-13) A(exp(1/3)) cm. In this energy range the ratios of the inelastic to total cross sections are all less than one-half.