Neutron Spectrometry With Scintillating Bolometers of LiF and Sapphire

作者：Coron Noel^*; Cuesta Clara; Garcia Eduardo; Ginestra Carlos; Gironnet Johann; de Marcillac Pierre; Martinez Maria; Ortigoza Ysrael; Ortiz de Solorzano Alfonso; Puimedon Jorge; Redon Thierry; Rolon Tomas; Sarsa Maria L; Torres Lidia; Villar Jose A

来源：IEEE Transactions on Nuclear Science, 2016, 63(3): 1967-1975.

DOI：10.1109/TNS.2016.2561280

• Bolometers
• neutrons
• radiation detectors
• solid scintillation detectors

Two 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 Cf-252. The analysis of nuclear recoils registered by sapphire and (n, alpha) captures by Li-6 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 Phi (E > 0.1 MeV) = 0.20 n s(-1)cm(-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, alpha) captures in LiF for spectrometry of fast neutrons.

• 出版日期2016-6