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    Neutron Field Shaping Using Graphite for Reaction Rate Measurements

    Source: Journal of Nuclear Engineering and Radiation Science:;2021:;volume( 007 ):;issue: 002::page 022004-1
    Author:
    Sobaleu, Mikita
    ,
    Košťál, Michal
    ,
    Šimon, Jan
    ,
    Losa, Evžen
    DOI: 10.1115/1.4049725
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Neutron field shaping is the suitable method for validation of cross section in various energy regions. By increasing the share of neutrons of a certain energy interval and decreasing the share of other, a reaction becomes more sensitive to selected neutrons. As a result, reaction cross section can be validated in selected energy regions more precisely. The shaping can be carried out by both neutron filters which are materials with high absorption in some energy region, or by diffusion material changing the shape of neutron spectra by means of slowing down process. In the presented experiments, the neutron field of the light reactor 0 (LR-0) research reactor was shaped by both using graphite blocks inserted into the core and Cd cladding for increasing the epithermal reaction rate share in total reaction rates. The calculations were carried out with the Monte Carlo N-Particle Transport Code 6 (MCNP6) code and the most recent nuclear data libraries. The results in the pure graphite neutron field are in good agreement; in case of Cd cladding, significant discrepancies were reported. In case of the 23Na(n,γ)24Na reaction, overestimation by about 14% was reached in International Reactor Dosimetry and Fusion File (IRDFF-II), results in other libraries are comparable. In case of 58Fe(n,γ)59Fe, the overestimation as high as 18% is reported in IRDFF-II. For 64Zn(n,γ)65Zn reasonable agreement was reached in evaluated nuclear data file (ENDF/B-VIII), where discrepancies in pure graphite neutron field or in case of Cd cladding are about 10–15%.
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      Neutron Field Shaping Using Graphite for Reaction Rate Measurements

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4276518
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    • Journal of Nuclear Engineering and Radiation Science

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    contributor authorSobaleu, Mikita
    contributor authorKošťál, Michal
    contributor authorŠimon, Jan
    contributor authorLosa, Evžen
    date accessioned2022-02-05T21:53:08Z
    date available2022-02-05T21:53:08Z
    date copyright2/19/2021 12:00:00 AM
    date issued2021
    identifier issn2332-8983
    identifier otherners_007_02_022004.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4276518
    description abstractNeutron field shaping is the suitable method for validation of cross section in various energy regions. By increasing the share of neutrons of a certain energy interval and decreasing the share of other, a reaction becomes more sensitive to selected neutrons. As a result, reaction cross section can be validated in selected energy regions more precisely. The shaping can be carried out by both neutron filters which are materials with high absorption in some energy region, or by diffusion material changing the shape of neutron spectra by means of slowing down process. In the presented experiments, the neutron field of the light reactor 0 (LR-0) research reactor was shaped by both using graphite blocks inserted into the core and Cd cladding for increasing the epithermal reaction rate share in total reaction rates. The calculations were carried out with the Monte Carlo N-Particle Transport Code 6 (MCNP6) code and the most recent nuclear data libraries. The results in the pure graphite neutron field are in good agreement; in case of Cd cladding, significant discrepancies were reported. In case of the 23Na(n,γ)24Na reaction, overestimation by about 14% was reached in International Reactor Dosimetry and Fusion File (IRDFF-II), results in other libraries are comparable. In case of 58Fe(n,γ)59Fe, the overestimation as high as 18% is reported in IRDFF-II. For 64Zn(n,γ)65Zn reasonable agreement was reached in evaluated nuclear data file (ENDF/B-VIII), where discrepancies in pure graphite neutron field or in case of Cd cladding are about 10–15%.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleNeutron Field Shaping Using Graphite for Reaction Rate Measurements
    typeJournal Paper
    journal volume7
    journal issue2
    journal titleJournal of Nuclear Engineering and Radiation Science
    identifier doi10.1115/1.4049725
    journal fristpage022004-1
    journal lastpage022004-8
    page8
    treeJournal of Nuclear Engineering and Radiation Science:;2021:;volume( 007 ):;issue: 002
    contenttypeFulltext
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