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Title: Alpha-Alpha scattering, chiral symmetry and {sup 8}Be lifetime

Alpha-alpha scattering is discussed in terms of a chiral two pion exchange potential (TPE) which turns out to be attractive and singular at the origin, hence demanding renormalization. When {sup 8}Be 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}{sub exp.} = 5.57(25)eV. The remaining discrepancy as well as the phase shift up to E{sub LAB} = 15 MeV could be accommodated by the leading nuclear peripheral contributions due to the {sup 3}H+p and {sup 3}He+n continuum.
Authors:
 [1]
  1. Departamento de Fisica Atomica, Molecular y Nuclear Universidad de Granada E-18071 Granada (Spain)
Publication Date:
OSTI Identifier:
21149155
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1030; Journal Issue: 1; Conference: SCADRON70: Workshop on scalar mesons and related topics honoring Michael Scadron's 70. birthday, Lisbon (Portugal), 11-16 Feb 2008; Other Information: DOI: 10.1063/1.2973487; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA DECAY; ALPHA PARTICLES; ALPHA REACTIONS; BERYLLIUM 8; CHIRAL SYMMETRY; CHIRALITY; CORRELATIONS; HELIUM 3; HELIUM 4 TARGET; LIFETIME; MEV RANGE; NUCLEAR DECAY; PHASE SHIFT; PIONS; POTENTIALS; RENORMALIZATION; RESONANCE PARTICLES; SCATTERING