Elsevier

Physics Letters B

Volume 103, Issue 1, 9 July 1981, Pages 9-12
Physics Letters B

n-n Effective range from the photon spectrum of the reaction πdγnn

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Abstract

Notable improvements in the treatment of the reaction πdγnn, extending the validity of the calculation to lower photon energies, permit a new analysis of a high statistics photon spectrum. A precise value of the effective range parameter γnn = 2.83 ± 0.11 fm has been obtained. The theoretical uncertainty is 0.11 fm. The value of the scattering length previously extracted from the same spectrum is confirmed, with ann = − 18.6 ± 0.5 fm.

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