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Cross-section measurement of $$^{237}$$Np$$(n,gamma)$$ from 10 meV to 1 keV at Japan Proton Accelerator Research Complex

Hirose, Kentaro; Furutaka, Kazuyoshi; Hara, Kaoru; Harada, Hideo  ; Kimura, Atsushi; Kin, Tadahiro*; Kitatani, Fumito; Koizumi, Mitsuo; Nakamura, Shoji; Oshima, Masumi; Toh, Yosuke  ; Igashira, Masayuki*; Katabuchi, Tatsuya*; Mizumoto, Motoharu*; Kamiyama, Takashi*; Kino, Koichi*; Kiyanagi, Yoshiaki*; Hori, Junichi*

The cross section of the $$^{237}$$Np$$(n,gamma)$$ reaction has been measured in the energy range from 10 meV to $$1$$ keV using the ANNRI-NaI detector at the Japan Proton Accelerator Research Complex (J-PARC). The cross section was obtained relative to that of the $$^{10}$$B$$(n,alpha)$$ reaction. The absolute value of the cross section was deduced by normalizing the relative cross section to the JENDL-4.0 evaluation at the first resonance. The thermal cross section was obtained to be (176.7$$pm$$4.7)b. The Maxwellian-averaged cross section for $$kT$$ = 25.3 meV was derived as (174.6$$pm$$5.1)b by referring the cross section from JENDL-4.0 below 10 meV. These results lead to the Westcott's $$g$$-factor of 0.988$$pm$$0.010.

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Category:Nuclear Science & Technology

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