1999 journal article

Double polarized neutron-proton scattering and meson-exchange nucleon-nucleon potential models

PHYSICAL REVIEW LETTERS, 83(14), 2711–2714.

By: B. Raichle*, C. Gould n, D. Haase n, M. Seely n, . Walston n, W. Tornow*, W. Wilburn*, S. Penttila*, G. Hoffmann*

co-author countries: United States of America 🇺🇸
Source: Web Of Science
Added: August 6, 2018

We report on polarized beam--polarized target measurements of the spin-dependent neutron-proton total cross-section differences in longitudinal and transverse geometries ( $\ensuremath{\Delta}{\ensuremath{\sigma}}_{L}$ and $\ensuremath{\Delta}{\ensuremath{\sigma}}_{T}$, respectively) between ${E}_{n}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}5$ and 20 MeV. Single-parameter phase-shift analyses were performed to extract the phase-shift mixing parameter ${\ensuremath{\varepsilon}}_{1}$, which characterizes the strength of the nucleon-nucleon tensor interaction at low energies. Consistent with the trend of previous determinations at ${E}_{n}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}25$ and 50 MeV, our values for ${\ensuremath{\varepsilon}}_{1}$ imply a stronger tensor force than predicted by meson-exchange nucleon-nucleon potential models and nucleon-nucleon phase-shift analyses.