A new measurement of the 1S0 neutron-neutron scattering length using the neutron-proton scattering length as a standard

Journal Article (Journal Article)

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. © 1999 The American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Gonzalez Trotter, DE; Salinas, F; Chen, Q; Crowell, AS; Glöeckle, W; Howell, CR; Roper, CD; Schmidt, D; Šlaus, I; Tang, H; Tornow, W; Walter, RL; Witała, H; Zhou, Z

Published Date

  • January 1, 1999

Published In

Volume / Issue

  • 83 / 19

Start / End Page

  • 3788 - 3791

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/PhysRevLett.83.3788

Citation Source

  • Scopus