Seminarium Fizyki Jądra Atomowego

With a threshold against breakup into 7Be + p of just 137.5 keV, 8B is perhaps the most weakly-bound ß-stable nucleus known. Given this very low threshold one might expect two things: a large breakup cross section and an important influence of coupling to the breakup on the elastic scattering, at least for incident energies close to the Coulomb barrier. Unfortunately, 8B is also one of the most difficult radioactive beams to produce at these energies, so that there is a lack of precision data. Nevertheless, it has been established that while the first supposition is justified by the available evidence the second is not; models of 8B assuming a 7Be + p structure predict large breakup cross sections consistent with available data but only a modest coupling influence on the elastic scattering. The effect of the very weak binding energy of 8B on its elastic scattering seems to be confined to what may be termed “static” effects. We examine this paradox and offer some suggestions towards an explanation of the enigma.

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