Determination of astrophysical S-factor via measurement of reaction

Structure ofN12usingC11+Perajärvi1, Fu2, Rogachev3 et al. 2006Phys. Rev. C

“…To study the states around the 8 B+α threshold at 8.008 MeV (from 6.5 to 11.0 MeV) in 12 N with the 11 C+p elastic and inelastic resonance scattering, a 125 MeV 11 C beam was employed. In this experiment plain 20.2 and 44.3-mg/cm 2 -thick (CH 2 ) n foils were used as the targets.…”

“…III. It also permitted direct studies of the inelastic component of the scattering for the states near the 8 B+α threshold. To evaluate the proton background originating from the 11 C+ nat C reactions when using the (CH 2 ) n targets, a 27.0-mg/cm 2 -thick carbon foil was bombarded at the same beam energy.…”

“…The resonance capture of α-particles could markedly increase the rate of 11 C production via the 8 B+α → 11 C+p reaction. The influence of a resonance on the 11 C production rate depends on its α-partial width; however, the α-partial width will always be relatively small because of its low penetrability.…”

“…In addition to the nuclear physics interest, studies involving 12 N around its 11 C+p threshold at 0.601 MeV are often also driven by nuclear astrophysics interests [4][5][6][7][8]. Namely, to be able to accurately determine the astrophysical rate of the 11 C(p, γ ) 12 N reaction, detailed knowledge of the low-lying level structure of 12 N is also required.…”

“…The 11 C(p, γ ) 12 N reaction is associated with hot pp chains that might be able to bypass the triple α process in producing CNO material in low-metallicity stars [9]. The 12 N excitation region in the vicinity of the 8 B+α threshold at 8.008 MeV is also important for astrophysics because of the formation of 11 C in the 8 B(α, p) reaction [9]. Favorable states in 12 N close to this threshold could strongly enhance the corresponding reaction rate.…”