Measurement of very high threshold reactions using 252Cf source. (December 2020)

• Record Type: Journal Article
• Authors: Schulc, Martin; Košťál, Michal; Šimon, Jan; Novák, Evžen; Juříček, Vlastimil; Mareček, Martin
• Is Part Of: Applied radiation and isotopes. Volume 166(2020:Dec.)
• Publication Date: 2020-12
• Subjects: Spectral averaged cross sections -- 252Cf -- (n, 3n) reactions; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2020.109355
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: Only neutron spectrum standard is 252 Cf spontaneous fission neutron spectrum. However, the high energy tail of this spectrum is loaded with high uncertainty. To reduce this uncertainty, it is crucial to use validated cross sections with low uncertainty. The explored set of reactions covers 58 Ni(n, X) 57 Co, 169 Tm(n, 3n) 167 Tm, 197 Au(n, 3n) 195 Au, 209 Bi(n, 3n) 207 Bi and 209 Bi(n, 4n) 206 Bi threshold reactions. Measurement of dosimetric 169 Tm(n, 3n) 167 Tm, 209 Bi(n, 3n) 207 Bi and 209 Bi(n, 4n) 206 Bi reactions spectral averaged cross sections (SACS) is included in NEA's High Priority Nuclear Data Request List. All these reactions SACS were measured for the first time. All SACS were derived from experimentally determined reaction rates by gamma spectrometry using the same high-purity germanium detector. In the case of 169 Tm(n, 3n) 167 Tm reaction, the difference between experimental and calculated value using the IRDFF-II library is only 1.45%. Concerning 197 Au(n, 3n) 195 Au reaction, the reasonable agreement is achieved only using the TENDL-2017 library. In the case of 209 Bi(n, 3n) 207 Bi reaction, agreement within uncertainty is not achieved with any library unlike 209 Bi(n, 4n) 206 Bi reaction where the agreement within uncertainty is achieved with IRDFF-II library. The best agreement for 58 Ni(n, X) 57 Co reaction is achieved using ENDF/B-VIII library. Highlights: Measurement of very high threshold SACS in 252 Cf(sp.f.) field. Investigation of 58 Ni(n, X) 57 Co, 169 Tm(n, 3n) 167 Tm, 197 Au(n, 3n) 195 Au, 209 Bi(n, 3n) 207 Bi and 209 Bi(n, 4n) 206 Bi reactions. Comparison of reaction rates with different nuclear data libraries.