Determination of the ^1S0 Neutron-Neutron Scattering Length Using nd Breakup in Recoil Geometry at 19 MeV
Abstract
There is a significant discrepancy between the recent measurements of the ^1S0 neutron-neutron (nn) scattering length (ann). González Trotter et al. [1] reported a value of ann= -18.7 ±0.6 fm from their nn coincidence cross-section measurements at a neutron beam energy of 13 MeV, while Huhn et al. [2] obtained ann= -16.3 ±0.4 fm from their nn final-state interaction (FSI) cross-section measurements made at 25 MeV using proton recoil geometry. We report the preliminary results of a new determination of ann at 19 MeV at TUNL made using the neutron-deuteron breakup reaction in recoil proton geometry. The recoil proton and one of the outgoing neutrons were detected in coincidence and their energies were measured using time-of-flight techniques. Details of the experiment, analysis, and preliminary results will be presented. [1] D.E. González Trotter et al., Phys. Rev. C 73, 034001 (2006). [2] V.H. Huhn et al., Phys. Rev. Lett. 85, 1190 (2000).
- Publication:
-
APS Southeastern Section Meeting Abstracts
- Pub Date:
- November 2009
- Bibcode:
- 2009APS..SES.HC002T