Energy dependence of the cross sections for the Mg24(16O,12C)28Si(g.s.) reaction

S. J. Sanders, H. Ernst, W. Henning, C. Jachcinski, D. G. Kovar, J. P. Schiffer, J. Barrette

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Abstract

Excitation functions have been measured at 0°and 180°for the Mg24(16O,12C)28 Si(g.s.) reaction, and at 180°for the Mg24(16O,12C)28 Si(2+) reaction over the energy range 36 MeV≤Ec.m.≤54 MeV. Angular distributions were measured at Ec.m.=35.5 and 36.2 MeV where, for the latter energy, much of the angular range between 0°and 180°was covered. These data, combined with earlier measurements at lower energies, establish that the reaction cross section is strongly influenced by resonances of the compound system over a large energy range. At the higher energies, however, both the energy averaged cross section and the resonance amplitudes fall off sharply. An attempt is made to reproduce the observed structure in the Si28(g.s.) 0°and 180°excitation functions by fitting to the data a band of Breit-Wigner resonances with an energy dependence proportional to J(J+1). The general behavior of the 0°and 180°yield is well reproduced by this procedure, even though there are twice as many resonance poles as there are clear bumps in the data. Some regularity is evident in the resulting resonance parameters, although the fitted resonance amplitudes show greater scatter than expected for a nuclear molecular band.

Original languageEnglish
Pages (from-to)1775-1782
Number of pages8
JournalPhysical Review C - Nuclear Physics
Volume31
Issue number5
DOIs
StatePublished - 1985
Externally publishedYes

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