A cusp in the 54Cr(p, γ)55Mn reaction

Absolute cross sections for the reactions ${}^{54}\text{Cr}\text{(}\text{p}\text{, γ)}{}^{55}\text{Mn and}{}^{54}\text{Cr}\text{(}\text{p, n}\text{)}{}^{54}\text{Mn}$ are presented for effective bombarding energies E_p from 0.830 to 3.606 MeV. A substantial cusp is observed in the ${}^{54}\text{Cr}\text{(}\text{p}\text{, γ)}{}^{55}\text{Mn}$ excitation function. The data are compared with the predictions of global Hauser-Feshbach models in order to evaluate their applicability to nucleosynthesis calculations.