Search for narrow nucleon resonances below pion threshold in theH(e,e′π+)Xand2H(e,e′p)Xreactions
| Autor: | M. Ases Antelo, Michael Seimetz, R. Böhm, M. Potokar, Achim Richter, U. Müller, J.M. Friedrich, L. Nungesser, Chary Rangacharyulu, D. Baumann, P. Jennewein, Thomas Walcher, G. Jover Mañas, R. Pérez Benito, R. Neuhausen, C. Ayerbe, P. Merle, J. Garcia Llongo, M. Weis, Damir Bosnar, M. O. Distler, J. Pochodzalla, G. Schrieder, Harald Merkel, Michael Kohl, M. Ding |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Physical Review C. 67 |
| ISSN: | 1089-490X 0556-2813 |
| DOI: | 10.1103/physrevc.67.065204 |
| Popis: | In two series of high-resolution coincidence experiments at the three-spectrometer facility at MAMI, the $\mathrm{H}{(e,e}^{\ensuremath{'}}{\ensuremath{\pi}}^{+})X$ and ${}^{2}\mathrm{H}{(e,e}^{\ensuremath{'}}p)X$ reactions were studied to search for narrow nucleon resonances below pion threshold. The missing-mass resolution was $0.6--1.6\mathrm{MeV}{/c}^{2}$ full width at half maximum in the proton experiment and $0.9--1.3\mathrm{MeV}{/c}^{2}$ in the deuteron experiment. The experiments covered the missing-mass region from the neutron mass up to about 1050 and $1100\mathrm{MeV}{/c}^{2},$ respectively. None of our measurements showed a signal for narrow resonances to a level of down to ${10}^{\ensuremath{-}4}$ with respect to the neutron peak in the missing-mass spectra. |
| Databáze: | OpenAIRE |
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