Precise determination of the neutron scattering length of lead isotopes $^{204}$Pb, $^{207}$Pb and $^{208}$Pb by neutron interferometry

The neutron scattering length of lead isotopes $^{204}$Pb, $^{207}$Pb and$^{208}$Pb are determined by a set of neutron interferometry experiments. The obtained values $b_{(208)} = 9.494(30)$ fm, $b_{(207)} = 9.286(16)$ fm, $b_{(204)} = 10.893(78)$ fm have much higher accuracy then current table data. Together with the precise value of b for natural lead, these results represent a complete set of data and allow one to calculate $b_{(206)} = 9.221(69)$ fm, which is in the very good agreement with the present day experimental value