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Photodisintegration of 127I: Systematic Uncertainties of Experiments and Data Evaluated Using Physical Criteria

Received: 24 August 2020     Accepted: 7 September 2020     Published: 23 September 2020
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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.

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

Keywords

127I, Partial Photoneutron Reactions, Data Reliability Criteria, Systematic Uncertainties, Experimental-Theoretical Method, New Evaluated Cross Sections

References
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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

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    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

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    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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  • @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}
    }
    

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  • 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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Author Information
  • Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia

  • Physics Faculty, Lomonosov Moscow State University, Moscow, Russia

  • Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia

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