First evidences for 19F(α, p)22Ne at astrophysical energies

[摘要] 19F experimental abundances is overestimated in respect to the theoretical one: it is therefore clear that further investigations are needed. We focused on the19F(α, p)22Ne reaction, representing the main destruction channel in He-rich environments. The lowest energy at which this reaction has been studied with direct methods is EC.M.≈ 0.91 MeV, while the Gamow region is between 0.39 ÷ 0.8 MeV, far below the Coulomb barrier (3.8 MeV). For this reason, an experiment at Rudjer Boskovic Institute (Zagreb) was performed, applying the Trojan Horse Method. Following this method we selected the quasi-free contribution coming from6Li(19F,p22Ne)2H at Ebeam=6 MeV at kinematically favourable angles, and the cross section at energies 0 C.M.

[发布机构] INFN-LNS, Via Santa Sofia, 62, Catania CT; 95123, Italy^1;Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Via Santa Sofia, 64, Catania CT; 95123, Italy^2;Kore University, Viale delle Olimpiadi, 1, Enna EN; 94100, Italy^3;Rudjer Boskovic Institut, Bijenika cesta, 54, Zagreb; 10000, Croatia^4;RIKEN, CNS, 2-1 Hirosawa, Wako, Saitama; 351-0198, Japan^5;Department of Physics, Sidho-Kanho-Birsha University, Purulia, WB; 723104, India^6

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Astrophysical energies;Coulomb barrier;Direct method;Region of interest;Trojan horse methods