Verification of the theory of primary radiation damage by comparison with experimental data

Огородникова, О. В.; Majerle, M.; Gann, V. V.; Čı́žek, Jakub; Hruška, Petr; Simakov, S.P.; Štefánik, Milan; Zach, V.

doi:10.1016/j.jnucmat.2019.07.019

Cited by 22 publications

(20 citation statements)

References 41 publications

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“…It was shown that 22.5 MeV protons produce mono-vacancies in W but the neutrons from the p(35 MeV)-Be generator produce vacancy clusters with an average size of 3–5 vacancies during irradiation at ambient temperature up to a fluence of 1.4 × 10 20 n/m 2 (corresponding to about 9 appm of the NRT-dpa). In the present paper, we extend the pioneer work 14 by comparing the cluster size of vacancy-type defects formed in W and Fe after irradiation with fission and wide-spectrum high energy neutrons.…”

Section: Introductionmentioning

confidence: 73%

“…located close to each other. Agglomeration of such vacancies into clusters is relatively easy, since it does not require diffusion to a long distance 14 .…”

Section: Resultsmentioning

confidence: 99%

“…Unlike low-Z materials, for example Fe, which require irradiation and subsequent measurement at cryogenic temperatures in order to neglect the impact of thermal effects on the defect recovery 30 , W has the advantage of high melting temperature and, therefore, migration of vacancy-type defects is insignificant even at 400 K. Since migration of interstitials occurs at significantly lower temperatures compared to vacancies, some vacancy-type defects in W were likely removed by recombination with migrating interstitials which are mobile well below room temperature.

Figure 4 Experimental data of the mean size of radiation-induced vacancy clusters in W and their density after irradiation in the LVR-15 reactor in comparison with high-energy p(35 MeV)-Be neutron irradiation 14 for each irradiation fluence indicated for the NRT-dpa values in appm. …”

Section: Resultsmentioning

confidence: 99%

“…A recent paper 14 compared radiation-induced defects in W and iron (Fe) irradiated with high-energy protons and neutrons. Positron annihilation lifetime spectroscopy (PALS) was employed for characterization of size and concentration of radiation-induced defects 15 .…”

Section: Introductionmentioning

confidence: 99%

“…In the work 14 , it was shown that experimental data for neutron- and proton-irradiated Fe are better described by the arc-dpa model than the NRT-dpa model. Whereas experimental data for neutron- and proton-irradiated W are between NRT-dpa and arc-dpa predictions.…”

Section: Introductionmentioning

confidence: 99%

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

Огородникова

Majerle

Čı́žek

et al. 2020

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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. This means that the physics of the primary radiation effects in materials is still not fully known and requires further study through a combination of modeling and experimental efforts. The present data serve as a basis for the development of an improved concept of the displacement process.

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Section: Introductionmentioning

confidence: 73%

“…located close to each other. Agglomeration of such vacancies into clusters is relatively easy, since it does not require diffusion to a long distance 14 .…”

Section: Resultsmentioning

confidence: 99%