Alpha-alpha interaction with chiral two pion exchange and 8Be lifetime
| dc.creator | Arriola, E. Ruiz | |
| dc.date | 2007-09-26 | |
| dc.date | 2007-10-18 | |
| dc.date.accessioned | 2026-07-07T08:36:46Z | |
| dc.date.available | 2026-07-07T08:36:46Z | |
| dc.description | Assuming that alpha particles are described by a scalar-isoscalar chiral invariant heavy field it is shown how chiral symmetry determines the alpha-alpha interaction at long distances unambiguously from dimensional power counting of an effective chiral Lagrangean. The leading strong contribution is given by a two pion exchange potential which turns out to be attractive and singular at the origin, hence demanding renormalization. When 8Be is treated as a resonance state a model independent correlation between the Q-factor and lifetime 1/Gamma for the decay into two alpha particles arises. For parameters compatible with potential model analyses of low energy pi-alpha scattering it is found a Breit-Wigner width Gamma = 4.3(3) eV very close to the experimental value, Gamma= 5.57 (25)eV. | |
| dc.description | 4 pages, 2 figures. Extensive changes. Typos and errors corrected | |
| dc.identifier | https://arxiv.org/abs/0709.4134 | |
| dc.identifier | http://arxiv.org/abs/0709.4134 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/140176 | |
| dc.subject | Nuclear Theory | |
| dc.title | Alpha-alpha interaction with chiral two pion exchange and 8Be lifetime | |
| dc.type | text |