Measurement of 23Na(n,2n) cross section in well-defined reactor spectra

Measurement of the23Na(n,2n) cross section in235U and252Cf fission neutron spectra

“…This value is determined with an uncertainty of 4.7% [5], where the major portion is formed by the uncertainty of the scaling factor used for absolute flux determination. The calculated values of the reaction rates are presented in Table 1 and Table 2.…”

“…The average scaling factors determined from Au and Ni differ by approximately 0.3%. The total uncertainty of the scaling factor is about 2% [5]. The irradiation of the capsule was performed at a power of approximately 5W, during almost 21 h.…”

“…The measured spectra were analyzed by Genie 2000 software. The reaction rate was inferred from the measured NPA [5]. All NPAs were corrected to true summation coincidences as the 1274.5 keV peak coincides with the annihilation peak 511 keV.…”

“…22 Na can originate not only from (n,2n) reaction but also from (γ ,n) reaction. It was proven that this contribution to 22 Na production rate can be neglected [5].…”