n-n Effective range from the photon spectrum of the reaction π?d→γnn |
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| Authors: | B Gabioud J-C Alder C Joseph J-F Loude N Morel A Perrenoud J-P Perroud MT Trân E Winkelmann W Dahme H Panke D Renker G Strassner P Truöl GF de Téramond |
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| Institution: | Institut de physique nucléare, Université de Laussanne, CH-1015 Lausnne, Switzerland;Sektion Physik, Universität München, D-8046 Garching, Fed. Rep. Germany;Physik Institut, Universität Zürich, CH-8001 Zürich, Switzerland;Escuela de Fisica, Universidad de Costa Rica, San José, Costa Rica |
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| Abstract: | Notable improvements in the treatment of the reaction π?d→γnn, 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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