Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-04-14
AIPConf.Proc.1030:135-140,2008
Physics
Nuclear Physics
Nuclear Theory
presented by at SCADRON 70 ``Scalar Mesons and Related Topics, Lisbon, 11-16 February 2008, 6 pages
Scientific paper
10.1063/1.2973487
Alpha-alpha scattering is discussed in terms of a chiral 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 a wide range of parameters compatible with potential model analyses of low energy pi-alpha scattering it is found Gamma = 4.4(4)eV} in fairly good agreement with the experimental value Gamma = 5.57 (25) eV. The remaining discrepancy as well as the phase shift up to ELAB=15MeV could be accommodated by the leading nuclear peripheral contributions due to the 3H+p and 3He+n continuum.
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