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Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra

Ogorodnikova, O. V.; Majerle, M.; Čížek, J.; Simakov, S.; Gann, V. V.; Hruška, P.; Kameník, J.; Pospíšil, J.; Štefánik, M.; Vinš, M.

Abstract:
The paper presents new knowledge on primary defect formation in tungsten (W) and iron (Fe) irradiated by fission and high-energy neutrons at near-room temperature. Using a well-established method of positron-annihilation lifetime-spectroscopy (PALS), it was found that irradiation of W in the fission reactor and by high-energy neutrons from the p(35 MeV)-Be generator leads to the formation of small radiation-induced vacancy clusters with comparable mean size. In the case of Fe, smaller mean size of primary radiation-induced vacancy clusters was measured after irradiation with fission neutrons compared to irradiation with high-energy neutrons from the p(35 MeV)-Be generator. It was found that one of the reasons of the formation of the larger size of the defects with lower density in Fe is lower flux in the case of irradiation with high-energy neutrons from the p(35 MeV)-Be source. The second reason is enhanced defect agglomeration and recombination within the energetic displacement cascade at high energy primary knock-on-atoms (PKAs). This is consistent with the concept of the athermal recombination corrected (arc-dpa) model, although the measured dpa cross-section of both fission neutrons and wide-spectrum high-energy neutrons in W is between the conventional Norgett–Robinson–Torrens (NRT-dpa) and arc-dpa predictions. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000126488
Veröffentlicht am 23.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Neutronenphysik und Reaktortechnik (INR)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.12.2020
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000126488
HGF-Programm 31.03.08 (POF III, LK 01) Neutronik
Erschienen in Scientific reports
Band 10
Heft 1
Seiten Art. Nr.: 18898
Vorab online veröffentlicht am 03.11.2020
Nachgewiesen in Web of Science
Scopus
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