Summary
The elastic angular distribution for the reaction16O+28Si is calculated for the bombarding energiesE c.m.=21.1 MeV and 22.7 MeV. The imaginary part of the ion-ion potential due to transfer reactions is calculated by making use of microscopic form factors. The depopulation of the entrance channel due to Coulomb excitation and inelastic processes is treated within the coupled-channel framework. By making use of a standard folding expression for the real part of the ion-ion potential the main features of the backward rise of the angular distribution are reproduced. Detailed agreement is obtained by introducing a very-short-range absorption and adjusting slightly the strength of the real potential.
Riassunto
Si calcola la distribuzione angolare elastica per la reazione16O+28Si per le energie di bombardamentoE c.m.=21.1 MeV e 22.7 MeV. La parte immaginaria del potenziale ione-ione dovuta a reazioni di trasferimento è calcolata facendo uso di fattori di forma microscopici. La depopolazione del canale di entrata dovuta a eccitazione coulombiana e processi inelastici è trattata nello schema a canali accoppiati. Facendo uso di un’espressione standard di convoluzione per la parte reale del potenziale ione-ione, le principali caratteristiche dell’aumento all’indietro della distribuzione angolare sono riprodotte. Un accordo dettagliato si ottiene introducendo un assorbimento a raggio molto corto ed aggiustando leggermente la forza del potenziale reale.
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It is noted that an alternative description exists (9) in which the oscillatory behaviour is absent before the coupling to the excited states of28Si is switched on. Common to both descriptions is the fact that the backward rise is a consequence of the transparency of the nuclear surface.
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Pollarolo, G., Broglia, R.A. Microscopic description of the backward rise of the elastic angular distribution of16O+28Si. Nuov Cim A 81, 278–290 (1984). https://doi.org/10.1007/BF02724170
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DOI: https://doi.org/10.1007/BF02724170