Threshold $$\pi ^-$$ photoproduction on the neutron

Recent data from the PIONS@MAX-lab Collaboration, measuring the total cross section of the incoherent pion photoproduction reaction, , near threshold, have been used to extract the multipole and total cross section of the reaction , also near threshold. These are the first measurements of the reaction in the threshold region. The value of is extracted through a fit to the deuteron data in a photoproduction model accounting for final-state interactions. The model takes an S -wave approximation for the elementary reaction with const in the threshold region. The fit over all the 6 deuteron data points gives the value (in units ). We explore the dependence of our results on the choice of data subsets included in the fit. The obtained values of , for different subsets, have overlapping errors and agree with previous determinations.