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- W3081629307 abstract "Recent data from the PIONS@MAX-lab Collaboration, measuring the total cross section of the incoherent pion photoproduction reaction, $$gamma drightarrow pi ^- pp$$ , near threshold, have been used to extract the $$E_{0+}$$ multipole and total cross section of the reaction $$gamma nrightarrow pi ^-p$$ , also near threshold. These are the first measurements of the reaction $$gamma drightarrow pi ^- pp$$ in the threshold region. The value of $$E_{0+}$$ 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 $$gamma nrightarrow pi ^-p$$ with $$hbox {E}_{0+} = $$ const in the threshold region. The fit over all the 6 deuteron data points gives the value $$E_{0+} = -,31.86pm 0.8$$ (in units $$10^{-3}/m_pi $$ ). We explore the dependence of our results on the choice of data subsets included in the fit. The obtained values of $$E_{0+}$$ , for different subsets, have overlapping errors and agree with previous determinations." @default.
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- W3081629307 date "2020-08-01" @default.
- W3081629307 modified "2023-09-29" @default.
- W3081629307 title "Threshold $$pi ^-$$ photoproduction on the neutron" @default.
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- W3081629307 doi "https://doi.org/10.1140/epja/s10050-020-00221-w" @default.
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