《Table 3 Gamma and neutron source strength from different evaluations》

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《A study of PFBR auxiliary neutron source strength activation and its variability with respect to the neutron spectrum and ~(123)Sb capture cross section》

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aD represents the deviation with respect to the average value br1represents the spectrum-averaged one-group capture cross section

Then，the total photoneutron reaction rate is estimated using the average saturation gamma flux in beryllium and the beryllium photoneutron cross section from ENDF/B-VII.1.The neutron source strength calculated by this method is 9.26 9 1011n/s/SA（saturated），and the estimated neutron yield is 1.87 9 10-4n/c.The photoneutron yield is also verified by an independent application-specific Monte Carlo simulation（MCS）of gamma transport in the SSA by assuming a uniform gamma source strength in the antimony pins and subsequent transport through the pins and beryllium block.The photonuclear and photoatomic interaction cross sections are obtained from ENDF/B-VII.1.Table 1 gives the estimated neutron yield per gamma.The results show that the neutron yields per gamma for the SSA antimony–beryllium geometry obtained by the two methods are in very good agreement.