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dc.contributor.authorGrieger, M.-
dc.contributor.authorHensel, T.-
dc.contributor.authorAgramunt, Jorge-
dc.contributor.authorBemmerer, D.-
dc.contributor.authorDegering, D.-
dc.contributor.authorDillmann, I.-
dc.contributor.authorFraile, L.M.-
dc.contributor.authorJordan, D.-
dc.contributor.authorKöster, U.-
dc.contributor.authorMarta, M.-
dc.contributor.authorMüller, S.E.-
dc.contributor.authorSzücs, T.-
dc.contributor.authorTain, José Luis-
dc.contributor.authorZuber, K.-
dc.identifierdoi: 10.1103/PhysRevD.101.123027-
dc.identifierissn:: 2470-0029-
dc.identifier.citationPhysical Review D 101: 123027 (2020)-
dc.description.abstractAmbient neutrons may cause significant background for underground experiments. Therefore, it is necessary to investigate their flux and energy spectrum in order to devise a proper shielding. Here, two sets of altogether ten moderated He3 neutron counters are used for a detailed study of the ambient neutron background in tunnel IV of the Felsenkeller facility, underground below 45 m of rock in Dresden/Germany. One of the moderators is lined with lead and thus sensitive to neutrons of energies higher than 10 MeV. For each He3 counter moderator assembly, the energy-dependent neutron sensitivity was calculated with the FLUKA code. The count rates of the ten detectors were then fitted with the MAXED and GRAVEL packages. As a result, both the neutron energy spectrum from 10-9 to 300 MeV and the flux integrated over the same energy range were determined experimentally. The data show that at a given depth, both the flux and the spectrum vary significantly depending on local conditions. Energy-integrated fluxes of (0.61±0.05), (1.96±0.15), and (4.6±0.4)×10-4 cm-2 s-1, respectively, are measured for three sites within Felsenkeller tunnel IV which have similar muon flux but different shielding wall configurations. The integrated neutron flux data and the obtained spectra for the three sites are matched reasonably well by FLUKA Monte Carlo calculations that are based on the known muon flux and composition of the measurement room walls.-
dc.description.sponsorshipFinancial support by DFG (BE 4100/4-1), the Helmholtz Association (NAVI VH-VI-417 and ERC-RA-0016), the Spanish Ministerio de Economía y Competitividad (Grants No. FPA2014-52823-C2, No. FPA2017-83946-C2, No. RTI2018-098868-B-I00, and No. SEV-2014-0398/ program Severo Ochoa), and the COST Association (ChETEC CA16117) is gratefully acknowledged-
dc.publisherAmerican Physical Society-
dc.relationMINECO/ICTI2013-2016/ FPA2014-52823-C2-1-P-
dc.relation.isversionofPublisher's version-
dc.titleNeutron flux and spectrum in the dresden felsenkeller underground facility studied by moderated he 3 counters-
dc.contributor.funderMinisterio de Economía y Competitividad (España)-
dc.contributor.funderMinisterio de Ciencia, Innovación y Universidades (España)-
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