MATXS multigroup file problem due to NJOY unresolved resonance processing

Konno, Chikara ; Tada, Kenichi ; Kwon, Saerom*

Neutron spectra inside a sphere of 1 m in radius, made of one natural isotope with unresolved resonance data, with an isotropic neutron source of 20 MeV at the center were calculated with the ANISN code and JENDL-4.0 MATXS file MATXSLIB-J40. Then unphysical neutron spectra produced in unresolved resonance data processing with the NJOY code were obtained. We examined its reasons and specified that unrealistic cross sections in dips between resonances caused the unphysical neutron spectra. We also demonstrated that this problem was solved by modifying NJOY.

Language	:	English
Journal	:	Proceedings of 14th International Conference on Radiation Shielding and 21st Topical Meeting of the Radiation Protection and Shielding Division (ICRS-14/RPSD 2022) (Internet)
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Pages	:	p.440 - 443
Publication Year/Month	:	2022/11
Meeting title	:	14th International Conference on Radiation Shielding and 21st Topical Meeting of the Radiation Protection and Shielding Division (ICRS-14/RPSD 2022)
Held date	:	2022/09
Location (city)	:	Seattle
Location (country)	:	U.S.A.
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Keywords	:	no keyword
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Registration No. : BB20211622
JAEA Abstracts No. : 51000078
Paper Submission No. : 26071

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