par Mendes Jr., Djalma;Lépine-Szily, Alinka;Descouvemont, Pierre 
;Lichtenthäler, Rüdiger Lichtenthäler De Matos;Guimarães, Valdir Alves;de Faria, Pedro Neto;Barioni, Adriana;Pires, Kelly Cristina Cezaretto;Morcelle, Viviane;Pampa Condori, R.;Morais, M.C.;Leistenschneider, E.;Lima, C. E F;Zamora, Jorge;Alcantara, J.A.;Zagatto, V. A B;Assunção, Marlete;Shorto, J. M B
Référence Physical review. C. Nuclear physics, 86, 6, 064321
Publication Publié, 2012-12
;Lichtenthäler, Rüdiger Lichtenthäler De Matos;Guimarães, Valdir Alves;de Faria, Pedro Neto;Barioni, Adriana;Pires, Kelly Cristina Cezaretto;Morcelle, Viviane;Pampa Condori, R.;Morais, M.C.;Leistenschneider, E.;Lima, C. E F;Zamora, Jorge;Alcantara, J.A.;Zagatto, V. A B;Assunção, Marlete;Shorto, J. M BRéférence Physical review. C. Nuclear physics, 86, 6, 064321
Publication Publié, 2012-12
Article révisé par les pairs
| Résumé : | We present a direct measurement of the low-energy 8Li(p ,α)5He cross section, using a radioactive 8Li beam impinging on a thick target. With four beam energies, we cover the energy range between Ec.m.=0.2 and 2.1 MeV. An R-matrix analysis of the data is performed and suggests the existence of two broad overlapping resonances (5/2+ at Ec.m.=1.69 MeV and 7/2+ at E c.m.=1.76 MeV). At low energies our data are sensitive to the properties of a subthreshold state (Ex=16.67 MeV) and of two resonances above threshold. These resonances were observed in previous experiments. The R-matrix fit confirms spin assignments, and provides partial widths. We propose a new 8Li(p,α)5He reaction rate and briefly discuss its influence in nuclear astrophysics. © 2012 American Physical Society. |
