Parity conservingγasymmetry inn-pradiative capture
| Autor: | Attila Csoto, G. L. Payne, B. F. Gibson |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Physical Review C. 56:631-634 |
| ISSN: | 1089-490X 0556-2813 |
| DOI: | 10.1103/physrevc.56.631 |
| Popis: | The importance of $n$-$p$ radiative capture, utilizing polarized cold neutrons, as a means of measuring the weak pion coupling constant is reviewed. Parity conserving processes of the form ${\mathbf{k}}_{\ensuremath{\gamma}}\ensuremath{\cdot}({\mathbf{s}}_{n}\ifmmode\times\else\texttimes\fi{}{\mathbf{k}}_{n})$ can contribute to the ${\mathbf{s}}_{n}\ensuremath{\cdot}{\mathbf{k}}_{\ensuremath{\gamma}}$ photon asymmetry in any such experiment, if the apparatus is not perfectly symmetric. For an incident laboratory neutron energy of 0.003 eV a value of ${A}_{\ensuremath{\gamma}}^{\mathrm{PC}}=0.67\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ is obtained for two different potential models (Argonne AV14 and Nijmegen Reid93). Serving as an extreme test case, the Reid soft core potential yields $0.61\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$, close to the result of the contemporary forces. Implications for extracting the weak pion coupling constant and for monitoring the beam polarization are discussed. |
| Databáze: | OpenAIRE |
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