EVALUATION OF THE RESPONSE MATRIX OF A BONNER SPHERE SPECTROMETER WITH LII DETECTOR FROM THERMAL-ENERGY TO 100 MEV

The neutron responses of a Bonner sphere spectrometric system with a 4 mmx4 mm (LiI)-Li-6 scintillator have been calculated using the MCNP M onte Carlo code in the energy range from thermal to 100 MeV. Calculate d responses have been interpolated to evaluate the response matrix wit h 51 energy points and 33 sphere diameters. Responses have been parame trized as a function of sphere mass by a hybrid log-normal function. F inally, the new response matrix has been compared with others reported in the literature and with recent experimental findings.