The experimental data for photoneutron reaction cross sections for 127I obtained using beams of quasimonoenergetic annihilation photons and the method of neutron multiplicity-sorting at Livermore (USA) and Saclay (France) were analyzed using objective physical data reliability criteria. It was found that data of both laboratories contain significant systematic uncertainties and therefore are not reliable. New data for partial and total photoneutron reactions cross sections for 127I satisfied physical criteria of data reliability were evaluated using experimental-theoretical method based on both experimental neutron yield reaction cross-section and results of calculation in the combined photonucleon reaction model (CPNRM). The neutron yield reaction cross-section obtained at Saclay (France) was used in evaluation procedure. The newly evaluated cross sections for partial (γ, 1n), (γ, 2n) and (γ, 3n) reactions for 127I were used for discussion in detail the problems of significant disagreements between experimental data for many nuclei obtained at Saclay and Livermore. It was found that systematic uncertainties of experimental data for the (γ, 1n), (γ, 2n), and (γ, 3n) reactions cross sections for 127I obtained at both laboratories are of different nature. One of the reasons of noticeable systematic uncertainties of cross sections obtained are the shortcomings of the procedures used to separate counts into 1n, 2n, and 3n events. At the same time it was shown that the main reason of significant disagreements between new evaluated data and data obtained at Livermore experiment for 127I is the loss of many neutrons from the (γ, 1n) reaction. This situation is analogous to those in Livermore experiments for 75As and 181Ta.
| Published in | American Journal of Physics and Applications (Volume 8, Issue 5) |
| DOI | 10.11648/j.ajpa.20200805.11 |
| Page(s) | 64-72 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2020. Published by Science Publishing Group |
127I, Partial Photoneutron Reactions, Data Reliability Criteria, Systematic Uncertainties, Experimental-Theoretical Method, New Evaluated Cross Sections
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APA Style
Vladimir V. Varlamov, Aleksandr I. Davydov, Vadim N. Orlin. (2020). Photodisintegration of 127I: Systematic Uncertainties of Experiments and Data Evaluated Using Physical Criteria. American Journal of Physics and Applications, 8(5), 64-72. https://doi.org/10.11648/j.ajpa.20200805.11
ACS Style
Vladimir V. Varlamov; Aleksandr I. Davydov; Vadim N. Orlin. Photodisintegration of 127I: Systematic Uncertainties of Experiments and Data Evaluated Using Physical Criteria. Am. J. Phys. Appl. 2020, 8(5), 64-72. doi: 10.11648/j.ajpa.20200805.11
AMA Style
Vladimir V. Varlamov, Aleksandr I. Davydov, Vadim N. Orlin. Photodisintegration of 127I: Systematic Uncertainties of Experiments and Data Evaluated Using Physical Criteria. Am J Phys Appl. 2020;8(5):64-72. doi: 10.11648/j.ajpa.20200805.11
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Download@article{10.11648/j.ajpa.20200805.11,
author = {Vladimir V. Varlamov and Aleksandr I. Davydov and Vadim N. Orlin},
title = {Photodisintegration of 127I: Systematic Uncertainties of Experiments and Data Evaluated Using Physical Criteria},
journal = {American Journal of Physics and Applications},
volume = {8},
number = {5},
pages = {64-72},
doi = {10.11648/j.ajpa.20200805.11},
url = {https://doi.org/10.11648/j.ajpa.20200805.11},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajpa.20200805.11},
abstract = {The experimental data for photoneutron reaction cross sections for 127I obtained using beams of quasimonoenergetic annihilation photons and the method of neutron multiplicity-sorting at Livermore (USA) and Saclay (France) were analyzed using objective physical data reliability criteria. It was found that data of both laboratories contain significant systematic uncertainties and therefore are not reliable. New data for partial and total photoneutron reactions cross sections for 127I satisfied physical criteria of data reliability were evaluated using experimental-theoretical method based on both experimental neutron yield reaction cross-section and results of calculation in the combined photonucleon reaction model (CPNRM). The neutron yield reaction cross-section obtained at Saclay (France) was used in evaluation procedure. The newly evaluated cross sections for partial (γ, 1n), (γ, 2n) and (γ, 3n) reactions for 127I were used for discussion in detail the problems of significant disagreements between experimental data for many nuclei obtained at Saclay and Livermore. It was found that systematic uncertainties of experimental data for the (γ, 1n), (γ, 2n), and (γ, 3n) reactions cross sections for 127I obtained at both laboratories are of different nature. One of the reasons of noticeable systematic uncertainties of cross sections obtained are the shortcomings of the procedures used to separate counts into 1n, 2n, and 3n events. At the same time it was shown that the main reason of significant disagreements between new evaluated data and data obtained at Livermore experiment for 127I is the loss of many neutrons from the (γ, 1n) reaction. This situation is analogous to those in Livermore experiments for 75As and 181Ta.},
year = {2020}
}
TY - JOUR T1 - Photodisintegration of 127I: Systematic Uncertainties of Experiments and Data Evaluated Using Physical Criteria AU - Vladimir V. Varlamov AU - Aleksandr I. Davydov AU - Vadim N. Orlin Y1 - 2020/09/23 PY - 2020 N1 - https://doi.org/10.11648/j.ajpa.20200805.11 DO - 10.11648/j.ajpa.20200805.11 T2 - American Journal of Physics and Applications JF - American Journal of Physics and Applications JO - American Journal of Physics and Applications SP - 64 EP - 72 PB - Science Publishing Group SN - 2330-4308 UR - https://doi.org/10.11648/j.ajpa.20200805.11 AB - The experimental data for photoneutron reaction cross sections for 127I obtained using beams of quasimonoenergetic annihilation photons and the method of neutron multiplicity-sorting at Livermore (USA) and Saclay (France) were analyzed using objective physical data reliability criteria. It was found that data of both laboratories contain significant systematic uncertainties and therefore are not reliable. New data for partial and total photoneutron reactions cross sections for 127I satisfied physical criteria of data reliability were evaluated using experimental-theoretical method based on both experimental neutron yield reaction cross-section and results of calculation in the combined photonucleon reaction model (CPNRM). The neutron yield reaction cross-section obtained at Saclay (France) was used in evaluation procedure. The newly evaluated cross sections for partial (γ, 1n), (γ, 2n) and (γ, 3n) reactions for 127I were used for discussion in detail the problems of significant disagreements between experimental data for many nuclei obtained at Saclay and Livermore. It was found that systematic uncertainties of experimental data for the (γ, 1n), (γ, 2n), and (γ, 3n) reactions cross sections for 127I obtained at both laboratories are of different nature. One of the reasons of noticeable systematic uncertainties of cross sections obtained are the shortcomings of the procedures used to separate counts into 1n, 2n, and 3n events. At the same time it was shown that the main reason of significant disagreements between new evaluated data and data obtained at Livermore experiment for 127I is the loss of many neutrons from the (γ, 1n) reaction. This situation is analogous to those in Livermore experiments for 75As and 181Ta. VL - 8 IS - 5 ER -
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