Characterization of extended range Bonner Sphere Spectrometers in the CERF high-energy broad neutron field at CERN

Agosteo, S.; Bedogni, R.; Caresana, M.; Charitonidis, N.; Chiti, M.; Esposito, A.; Ferrarini, M.; Severino, Clizia Tecla; Silari, M.

doi:10.1016/j.nima.2012.06.055

Cited by 22 publications

(8 citation statements)

References 44 publications

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“…IV) were compared with the data from the 252 Cf source runs. Since the FLUKA code has been extensively validated for its description of neutron interactions [58], e.g., the 252 Cf runs serve to verify the correct implementation of detector and moderator geometry in the present simulation.…”

Section: F Comparison Of 252 Cf Source Data and Fluka Simulationmentioning

confidence: 99%

Neutron flux and spectrum in the Dresden Felsenkeller underground facility studied by moderated He3 counters

et al. 2020

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Ambient 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 3 He 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 3 He 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 AE 0.05), (1.96 AE 0.15), and ð4.6 AE 0.4Þ × 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.

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Section: F Comparison Of 252 Cf Source Data and Fluka Simulationmentioning

confidence: 99%

Neutron flux and spectrum in the Dresden Felsenkeller underground facility studied by moderated He3 counters

et al. 2020

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“…The ER-BSS from INFN-LNF [16][17][18] consists of 14 polyethylene (PE) spheres, labelled with their diameter in inches: 0 = bare thermal neutron detector, 2 , 2.5 , 3 , 3.5 , 4 , 4.5 , 5 , 7 , 8 , 10 , plus three highenergy spheres, called ERS-1, ERS-2 (7 external diameter, with an internal 4 PE sphere surrounded by 1.27 cm of lead or copper, respectively) and ERS-3 (12 external diameter, with an internal 3.15 PE sphere surrounded by 1 cm of lead). The central thermal neutron detector is a cylindrical 4 × 4 mm 6 LiI(Eu) scintillator, whose pulse height distribution is used to discriminate thermal neutrons from the photon contribution.…”

Section: Bonner Sphere Spectrometermentioning

confidence: 99%

“…This can be done by providing a guess spectrum, typically from Monte Carlo simulations. A statistical package, built into the FRUIT deconvolution code [16,21,22], propagates uncertainties of input quantities through the unfolding process, thus obtaining distribution probabilities and uncertainties for the neutron spectrum on a bin-by-bin basis.…”

Section: Bonner Sphere Spectrometermentioning

confidence: 99%

A neutron source for IGISOL-JYFLTRAP: Design and characterisation

et al. 2017

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Abstract.A white neutron source based on the Be(p, nx) reaction for fission studies at the IGISOL-JYFLTRAP facility has been designed and tested. 30 MeV protons impinge on a 5 mm thick water-cooled beryllium disc. The source was designed to produce at least 10 12 fast neutrons/s on a secondary fission target, in order to reach competitive production rates of fission products far from the valley of stability. The Monte Carlo codes MCNPX and FLUKA were used in the design phase to simulate the neutron energy spectra. Two experiments to characterise the neutron field were performed: the first was carried out at The Svedberg Laboratory in Uppsala (SE), using an Extended-Range Bonner Sphere Spectrometer and a liquid scintillator which used the time-of-flight (TOF) method to determine the energy of the neutrons; the second employed Thin-Film Breakdown Counters for the measurement of the TOF, and activation foils, at the IGISOL facility in Jyväskylä (FI). Design considerations and the results of the two characterisation measurements are presented, providing benchmarks for the simulations.

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“…Moreover, the solution spectrum is not uniquely determined, but depends on the unfolding code employed (4) . The CERN BSS (5,6) employs a spherical 3 He proportional counter as thermal neutron detector and it comprises seven spheres: five made of polyethylene with outer diameters of 81, 108, 133, 178, 233 mm, complemented by other two, nicknamed 'Ollio' and 'Stanlio', where cadmium and lead inserts have been introduced in order to reduce the sensitivity to thermal neutrons and increase it at high energies, up to the GeV range.…”

Section: Introductionmentioning

confidence: 99%

A Bonner Sphere Spectrometer for Pulsed Fields

Aza

Dinar

Manessi

et al. 2015

Radiat Prot Dosimetry

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The use of conventional Bonner Sphere Spectrometers (BSS) in pulsed neutron fields (PNF) is limited by the fact that proportional counters, usually employed as the thermal neutron detectors, suffer from dead time losses and show severe underestimation of the neutron interaction rate, which leads to strong distortion of the calculated spectrum. In order to avoid these limitations, an innovative BSS, called BSS-LUPIN, has been developed for measuring in PNF. This paper describes the physical characteristics of the device and its working principle, together with the results of Monte Carlo simulations of its response matrix. The BSS-LUPIN has been tested in the stray neutron field at the CERN Proton Synchrotron, by comparing the spectra obtained with the new device, the conventional CERN BSS and via Monte Carlo simulations.

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Characterization of extended range Bonner Sphere Spectrometers in the CERF high-energy broad neutron field at CERN

Cited by 22 publications

References 44 publications

Neutron flux and spectrum in the Dresden Felsenkeller underground facility studied by moderated He3 counters

Neutron flux and spectrum in the Dresden Felsenkeller underground facility studied by moderated He3 counters

A neutron source for IGISOL-JYFLTRAP: Design and characterisation

A Bonner Sphere Spectrometer for Pulsed Fields

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