Abstract
Recent measurements have confirmed the value 1.7 ± 0.3 for the ratio between4He(γ, p) and (γ, n) reaction cross-sections in the excitation energy range 24 ≤Ex ≤ 30 MeV. This large deviation from unity implies isospin symmetry breaking an order of magnitude larger than that predicted from direct Coulomb effects using conventional shell model estimates. We present here a phenomenological model search using continuum calculations, undertaken to identify those features of the problem that more complete future treatments must yield to explain the experimental data.
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