Neutron flux and spectrum in the Dresden Felsenkeller underground facility studied by moderated He-3 counters

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dc.contributor.authorGrieger, M.
dc.contributor.authorHensel, T.
dc.contributor.authorAgramunt, J.
dc.contributor.authorBemmerer, D.
dc.contributor.authorDegering, D.
dc.contributor.authorDillmann, I.
dc.contributor.authorFraile Prieto, Luis Mario
dc.contributor.authorJordan, D.
dc.contributor.authorKoster, U.
dc.contributor.authorMarta, M.
dc.contributor.authorMueller, S. E.
dc.contributor.authorSzuecs, T.
dc.contributor.authorTain, J. L.
dc.contributor.authorZuber, K.
dc.date.accessioned2023-06-16T15:20:31Z
dc.date.available2023-06-16T15:20:31Z
dc.date.issued2020-06-24
dc.description© 2020 American Physical Society. The authors are indebted to Alfredo Ferrari (CERN) for helpful discussions regarding the FLUKA code. Financial 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.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 He-3 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 He-3 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) x 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.departmentDepto. de Estructura de la Materia, Física Térmica y Electrónica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía y Competitividad (MINECO)
dc.description.sponsorshipCentro de Excelencia Severo Ochoa
dc.description.sponsorshipDFG German Research Foundation
dc.description.sponsorshipHelmholtz Association
dc.description.sponsorshipCOST Association
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/61637
dc.identifier.doi10.1103/PhysRevD.101.123027
dc.identifier.issn1550-7998
dc.identifier.officialurlhttps://doi.org/10.1103/PhysRevD.101.123027
dc.identifier.relatedurlhttps://journals.aps.org/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/6414
dc.issue.number12
dc.journal.titlePhysical review D
dc.language.isoeng
dc.publisherAmer Physical Soc
dc.relation.projectID(FPA2014-52823-C2; FPA2017-83946-C2; RTI2018-098868-B-I00)
dc.relation.projectIDSEV-2014-0398
dc.relation.projectIDBE 4100/4-1
dc.relation.projectIDNAVI VH-VI-417
dc.relation.projectIDChETEC CA16117
dc.relation.projectIDERC-RA-0016
dc.rights.accessRightsopen access
dc.subject.cdu539.1
dc.subject.keywordLevel counting techniques
dc.subject.keywordMultisphere spectrometer
dc.subject.keywordHigh-energy
dc.subject.keywordRadioactivity
dc.subject.keywordSensitivity
dc.subject.keywordSystem
dc.subject.keywordDepth
dc.subject.keywordNemus
dc.subject.keywordLead
dc.subject.ucmFísica nuclear
dc.subject.unesco2207 Física Atómica y Nuclear
dc.titleNeutron flux and spectrum in the Dresden Felsenkeller underground facility studied by moderated He-3 counters
dc.typejournal article
dc.volume.number101
dspace.entity.typePublication
relation.isAuthorOfPublicationec83106c-33f4-426c-afd6-68c5d859f9d4
relation.isAuthorOfPublication.latestForDiscoveryec83106c-33f4-426c-afd6-68c5d859f9d4
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