https://doi.org/10.1140/epja/s10050-020-00221-w
Regular Article - Theoretical Physics
Threshold 
photoproduction on the neutron
1
Department of Physics, Institute for Nuclear Studies, The George Washington University, Washington, DC, 20052, USA
2
National Research Centre “Kurchatov Institute”, Institute for Theoretical and Experimental Physics (ITEP), Moscow, 117218, Russia
* e-mail: igor@gwu.edu
Received:
16
April
2020
Accepted:
11
August
2020
Published online:
27
August
2020
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.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020
