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. 2022 Mar 22;82(3):248. doi: 10.1140/epjc/s10052-022-10184-5

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© The Author(s) 2022

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Fig. 6 — Energy spectrum of radiogenic neutrons obtained using the SOURCES4C code [25] for PE, Pb and Cu shielding layers. The double peak in the energy distribution of PE is due to the presence of $^{13}$ C, which has a high cross section for $(α, n)$ interactions. All spectra are normalized to unit integral