doi:10.1109/TNS.2016.2561280engCoron, N.Cuesta, C.Garcia, E.Ginestra, C.Gironnet, J.De Marcillac, P.Martinez, M.Ortigoza, Y.Ortiz de Solorzano, A./Puimedon, J.Redon, T.Rolon, T.Sarsa, M.L.Torres, L.Villar, J.A.Neutron Spectrometry with Scintillating Bolometers of LiF and SapphireART-2016-95650Two scintillating bolometers of LiF (33 g) and Al2O3 (50 g) at 20 mK, inside a lead shielding at the Canfranc Underground Laboratory, were irradiated with neutrons from a source of 252Cf. The analysis of nuclear recoils registered by sapphire and (n, a) captures by 6Li shows the feasibility of these cryogenic devices to measure the spectral flux of a neutron field. Data unfolding was done assuming that the spectral flux is a piecewise constant function defined on six energy groups. It can be solved by using non-negative least squares without additional assumptions on the neutron flux. The model provides consistent results with the spectra of the observed events in bolometers, giving a fast neutron flux of F(E > 0.1 MeV) = 0.20 n s-1cm-2 with a 15% uncertainty after 3 hours of live time. After our analysis, it can be concluded that nuclear recoils in sapphire are more useful than (n, a) captures in LiF for spectrometry of fast neutrons.2016http://zaguan.unizar.es/record/5672510.1109/TNS.2016.2561280http://zaguan.unizar.es/record/56725oai:zaguan.unizar.es:56725info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2008-03228info:eu-repo/grantAgreement/ES/MICINN/FPI-CSD2009-00064info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2011-23749IEEE TRANSACTIONS ON NUCLEAR SCIENCE 63, 3 (2016), 1967-1975by-nchttp://creativecommons.org/licenses/by-nc/3.0/es/info:eu-repo/semantics/openAccess