Double Polarized Neutron-Proton Scattering and Meson-Exchange Nucleon-Nucleon Potential Models
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...
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Veröffentlicht in: | Physical Review Letters 1999-10, Vol.83 (14), p.2711-2714 |
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Hauptverfasser: | , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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} |
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ISSN: | 0031-9007 1079-7114 |
DOI: | 10.1103/PhysRevLett.83.2711 |