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  1. 防災科研関係論文

Improved accuracy in the determination of the thermal cross section of <sup>14</sup>N(n, p) <sup>14</sup>C for neutron lifetime measurement

https://nied-repo.bosai.go.jp/records/4699
https://nied-repo.bosai.go.jp/records/4699
5ece3435-6ee4-4c91-a8de-fd33aae13e74
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Improved accuracy in the determination of the thermal cross section of <sup>14</sup>N(n, p) <sup>14</sup>C for neutron lifetime measurement
言語
言語 eng
著者 R. Kitahara

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en R. Kitahara

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K. Hirota

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en K. Hirota

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S. Ieki

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en S. Ieki

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T. Ino

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Y. Iwashita

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en Y. Iwashita

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M. Kitaguchi

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en M. Kitaguchi

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J. Koga

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K. Mishima

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en K. Mishima

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A. Morishita

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N. Nagakura

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en N. Nagakura

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H. Oide

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H. Otono

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Y. Seki

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D. Sekiba

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T. Shima

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H. M. Shimizu

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N. Sumi

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H. Sumino

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K. Taketani

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T. Tomita

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T. Yamada

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S. Yamashita

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M. Yokohashi

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T. Yoshioka

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抄録
内容記述タイプ Other
内容記述 c 2019 The Author(s). In a neutron lifetime measurement at the Japan Proton Accelerator Complex, the neutron lifetime is calculated from the neutron decay rate and the incident neutron flux. The flux is obtained by counting the protons emitted from the neutron absorption reaction of 3He gas, which is diluted in a mixture of working gas in a detector. Hence, it is crucial to determine the amount of 3He in the mixture. In order to improve the accuracy of the number density of the 3He nuclei, we have suggested using the 14N(n, p)14C reaction as a reference because this reaction involves similar kinetic energy to the 3He(n,p)3 H reaction and a smaller reaction cross section to introduce reasonable large partial pressure. The uncertainty of the recommended value of the cross section, however, is not satisfied with our requirement. In this paper we report the most accurate experimental value of the cross section of the 14N(n,p)14C reaction at a neutron velocity of 2200 m s-1, measured relative to the 3He(n,p)3H reaction. The result was 1.868 \pm 0.003 (stat.) ± 0.006 (sys.) b. Additionally, the cross section of the 17O(n,α)14C reaction at the neutron velocity is also redetermined as 249 ± 6 mb.
言語 en
書誌情報 en : Progress of Theoretical and Experimental Physics

巻 2019, 号 9, p. 093C01, 発行日 2019-09-26
ISSN
収録物識別子タイプ EISSN
収録物識別子 2050-3911
DOI
関連識別子 10.1093/ptep/ptz096
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