Abstract
Neutron energy spectrum for energies extending up to 15 MeV has been measured in the Hall A of INFN Laboratori Nazionali del Gran Sasso in Italy, by using a mathrm {1.5~m^3} stainless-steel tank filled with 1.2 ton Gd-doped liquid scintillator. A two-pulse signature, due to proton recoils and delayed gammas from neutron capture on Gd, has been used for event selection. The neutron energy spectrum has been obtained from the detected proton-recoil spectrum, after unfolding the detector response, which had been simulated with GEANT4. Although this spectrum has been measured previously, the present work represents an improvement in the energy resolution with respect to previously published results. The results obtained with this technique are compared with other measurements existing in literature.
Highlights
Aim of the present work is the measurement of the neutron flux inside one of the experimental halls of the Laboratori Nazionali del Gran Sasso (LNGS) which could be used as input in simulation works for designing future large-scale detectors
Neutron energy spectrum for energies extending up to 15 MeV has been measured in the Hall A of INFN Laboratori Nazionali del Gran Sasso in Italy, by using a 1.5 m3 stainless-steel tank filled with 1.2 ton Gd-doped liquid scintillator
Aim of the present work is the measurement of the neutron flux inside one of the experimental halls of the LNGS which could be used as input in simulation works for designing future large-scale detectors
Summary
Aim of the present work is the measurement of the neutron flux inside one of the experimental halls of the LNGS which could be used as input in simulation works for designing future large-scale detectors. Exploiting the existence of a 1.5 m3 Gd-loaded scintillator detector, partially exposed to the cavern rock radioactivity, a cost effective measurement of the neutron flux was possible. The big volume of the Gddoped scintillator detector allows the identification of neutron events by their capture on Gd, which is characterized by the emission of a γ -cascade with enough energy (∼8 MeV) to emerge from background. This paper describes the detector and its location inside the experimental hall A in Sect. 2. Calibration procedures for both, electron and nuclear recoils, are described in Sect.
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