Pair decay width of the Hoyle state and its role for stellar carbon production.

摘要: The pair decay width of the first excited ${0}^{+}$ state in $^{12}\mathrm{C}$ (the Hoyle state) is deduced from a novel analysis world data on inelastic electron scattering covering wide momentum transfer range, thereby resolving previous discrepancies. extracted value ${\ensuremath{\Gamma}}_{\ensuremath{\pi}}=(62.3\ifmmode\pm\else\textpm\fi{}2.0)\text{ }\text{ }\ensuremath{\mu}\mathrm{eV}$ independently confirmed by new at low transfers measured S-DALINAC and reduces uncertainty literature values more than factor 3. A precise knowledge ${\ensuremath{\Gamma}}_{\ensuremath{\pi}}$ mandatory for quantitative studies some key issues modeling supernovae asymptotic giant branch stars, most likely site slow-neutron nucleosynthesis process.