A New Measurement of the 1S0 Neutron-Neutron Scattering Length using the Neutron-Proton Scattering Length as a Standard

D. E. Gonzalez Trotter; F. Salinas; Q. Chen; A. S. Crowell; W. Gloeckle; C. R. Howell; C. D. Roper; D. Schmidt; I. Slaus; H. Tang; W. Tornow; R. L. Walter; H. Witala; Z. Zhou

doi:10.1103/physrevlett.83.3788

arXiv · nucl-ex/9904011

A New Measurement of the 1S0 Neutron-Neutron Scattering Length using the Neutron-Proton Scattering Length as a Standard

D. E. Gonzalez Trotter·F. Salinas·Q. Chen·A. S. Crowell·W. Gloeckle·C. R. Howell·C. D. Roper·D. Schmidt·I. Slaus·H. Tang·W. Tornow·R. L. Walter·H. Witala·Z. Zhou

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Abstract

The present paper reports high-accuracy cross-section data for the 2H(n,nnp) reaction in the neutron-proton (np) and neutron-neutron (nn) final-state-interaction (FSI) regions at an incident mean neutron energy of 13.0 MeV. These data were analyzed with rigorous three-nucleon calculations to determine the 1S0 np and nn scattering lengths, a_np and a_nn. Our results are a_nn = -18.7 +/- 0.6 fm and a_np = -23.5 +/- 0.8 fm. Since our value for a_np obtained from neutron-deuteron (nd) breakup agrees with that from free np scattering, we conclude that our investigation of the nn FSI done simultaneously and under identical conditions gives the correct value for a_nn. Our value for a_nn is in agreement with that obtained in pion-deuteron capture measurements but disagrees with values obtained from earlier nd breakup studies.

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D. E. Gonzalez Trotter, F. Salinas, Q. Chen, A. S. Crowell, W. Gloeckle, C. R. Howell, C. D. Roper, D. Schmidt, I. Slaus, H. Tang, W. Tornow, R. L. Walter, H. Witala, Z. Zhou. 1999-08-11. A New Measurement of the 1S0 Neutron-Neutron Scattering Length using the Neutron-Proton Scattering Length as a Standard. https://doi.org/10.1103/physrevlett.83.3788

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