Double Polarized Neutron-Proton Scattering and Meson-Exchange Nucleon-Nucleon Potential Models
- Department of Physical Sciences, Morehead State University, Morehead, Kentucky 40351 (United States)
- Physics Department, North Carolina State University, Raleigh, North Carolina 27695 (United States)
- Physics Department, Duke University, Durham, North Carolina 27708 (United States)
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- University of Texas, Austin, Texas 78712 (United States)
We report on polarized beam{endash}polarized target measurements of the spin-dependent neutron-proton total cross-section differences in longitudinal and transverse geometries ({Delta}{sigma}{sub L} and {Delta}{sigma}{sub T} , respectively) between E{sub n}=5 and 20thinspthinspMeV. Single-parameter phase-shift analyses were performed to extract the phase-shift mixing parameter {var_epsilon}{sub 1} , which characterizes the strength of the nucleon-nucleon tensor interaction at low energies. Consistent with the trend of previous determinations at E{sub n}=25 and 50thinspthinspMeV, our values for {var_epsilon}{sub 1} imply a stronger tensor force than predicted by meson-exchange nucleon-nucleon potential models and nucleon-nucleon phase-shift analyses. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 686895
- Journal Information:
- Physical Review Letters, Vol. 83, Issue 14; Other Information: PBD: Oct 1999
- Country of Publication:
- United States
- Language:
- English
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