VI Reunião de Trabalho Física Nuclear.pdf - Sociedade Brasileira ...

Fig. 1: Cross-sections at 0 = 1800 vs. E C.M."
Dashed line is the pure Coulomb elastic
scattering cross-section for 16 0+ 28 Si.
Dotted line is the cross-section obtained
with the E-18 potential. Full curve is
the experimental 18e-excitation function
fo r 16 0+ 28 Si, and dashed-dotted one
for
160 + 30 Si.
at a mid-point between a pure Rutherford (no nuclear structure
whatsover) and a pure strong absorption, E-18 (nuclear structure
manifested purely optically).
Several interpretations have been advanced in the
quest for a consistent description of the data. For a detailed
discussion we refer the reader to the recent review by Braun-
Munzinger and Barrette 2) . These interpretations range from
a pure resonance, intermediate structure, picture affecting -
both the angular distributions and the excitation functions, to
a pure-direct picture involving basically coupled channels
feed-back-type effects. Neither of these extreme pictures
seems to account for all facets of the data. Although recent
measurements of angular distributions of a-transfer_reactions,
as well as inelastic scattering, of systems such as 16
04 28 si
structure interpretation . of the gross structure of the anomalous
back angle elastic scattering is not viable, owing to the lack
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indicate that a pure, isolated resonance generated, intermediate