EVALUATION OF NEUTRON FUNDAMENTAL PARAMETERS FROM THE TOTAL CROSS-SECTION DATA

Using experimental data from the neutron transmission measurements on enriched Pb-206,Pb-207,Pb-208, natural Pb and Ri targets, the potentia l scattering radii R' and the electric polarizability of the neutron a lpha(n) were determined by general least squares fit at fixed neutron- electron bound scattering length values: b(ne) = -1.32.10(-3) fm (Garc hing) and b(ne) = -1.59.10(-3) fm (Dubna). The evaluations were perfor med in two versions: (1) The potential scattering radii R' were taken as fitted parameters; (2) R' values were deduced from optical model ca lculations. The obtained potential scattering radii values are in the range R' = 9.0 - 10.0 fm. The electric polarizability of the neutron i n the first version resulted in alpha(n) = + (0.12 +/- 0.44).10(-3) fm (3) with the Garching b(ne) value and alpha(n) = -(0.97 +/- 0.44) 10(- 3) fm(3) with the Dubna b(ne) value, but in the second calculation ver sion - in alpha(n) = -(0.14 +/- 0.37) 10(-3) fm(3) with both b(ne) val ues. On the basis of obtained results we give preference to the Garchi ng b(ne) value.