Recoil and charged particle energy spectra from the .sup.nat./sup.Si(n,x) reaction and the Si semiconductor detector response to the 14 MeV neutrons

0566556 - ÚJF 2024 RIV GB eng J - Článek v odborném periodiku
Simakov, S. P. - Majerle, Mitja - Košťál, M.
Recoil and charged particle energy spectra from the ^natSi(n,x) reaction and the Si semiconductor detector response to the 14 MeV neutrons.
Radiation Physics and Chemistry. Roč. 203, FEB (2023), č. článku 110624. ISSN 0969-806X. E-ISSN 1879-0895
GRANT EU: European Commission(BE) 101052200
Institucionální podpora: RVO:61389005
Klíčová slova: 14 MeV neutron irradiation * Silicon neutron data * Semiconductor response * Monte Carlo simulation * Field funneling impact
Obor OECD: Nuclear related engineering
Impakt faktor: 2.9, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.radphyschem.2022.110624

The energy spectra of light and heavy charged particles generated by the 14 MeV neutrons in silicon nuclei and in the Si semiconductor detector (SSD) were analysed. The existing measurements were used to validate the cor-responding energy differential cross sections from major evaluations ENDF/B-VIII.0 and JEFF-3.3. The required data were extracted by the various codes: NJOY21, SPKA and MCNP6. It was shown that both evaluations un-derestimate the high energy part of the 28Si(n,x)p-and alpha-particle spectra by <= 50%, whereas at smaller emission energies no experimental data even exist. The calculation of the atom displacement damage in SSD reveals that the secondary protons produce additionally approximate to 15% of damage, whereas the contribution from secondary alphas is impossible to estimate since the Si(alpha,x) recoil data are not available. The single experiment, carried out by K. Yageta and co-workers in 1988, reported the energy spectra in the Si semiconductor down to the rather low energy of approximate to 0.3 MeV, at which the production of reaction recoils domi-nates over the light ions. The Monte Carlo simulation of this experiment was performed by MCNP6. The gen-eration and transport of all relevant ions were taken in account. The energy depositions from protons or alphas were summed with their associated recoils after correction for non-ionization losses. The neutron reactions in the dead layer of the SSD were shown to increase the counts in active layer by (1-20)% depending on sort of ions. The impact of the field funneling effect was studied. Consideration of all these underlying processes has even-tually allowed a reasonable reproduction of this experiment.
Trvalý link: https://hdl.handle.net/11104/0337875