The reactions Si-30 + Er-170 and Si-29 + Er-170 have been studied by the particle-gamma coincidence method. The first chance a-particle spectrum from the decay of the Pb-200 compound nucleus at 80 MeV excitation energy has been obtained by using a subtraction technique. The emission barrier distribution has been extracted from the first chance spectrum, using the second derivative analysis, commonly employed in sub-barrier fusion studies. The comparison with earlier systematics demonstrates that the alpha -particle emission barriers of the excited systems are lower than those observed in the inverse (capture) reactions on ground state nuclei.
Exploring the emission barriers in hot nuclei
VIESTI, GIUSEPPE;LUNARDON, MARCELLO;
2001
Abstract
The reactions Si-30 + Er-170 and Si-29 + Er-170 have been studied by the particle-gamma coincidence method. The first chance a-particle spectrum from the decay of the Pb-200 compound nucleus at 80 MeV excitation energy has been obtained by using a subtraction technique. The emission barrier distribution has been extracted from the first chance spectrum, using the second derivative analysis, commonly employed in sub-barrier fusion studies. The comparison with earlier systematics demonstrates that the alpha -particle emission barriers of the excited systems are lower than those observed in the inverse (capture) reactions on ground state nuclei.Pubblicazioni consigliate
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