First direct measurement of the total cross section of   12C(alpha,gamma)16O
  The total cross section of 12C(alpha,gamma)16O was measured for the first time by a direct and ungated detection of the 16O recoils. This measurement in inverse kinematics using the recoil mass separator ERNA in combination with a windowless He gas target allowed to collect data with high precision in the energy range E=1.9 to 4.9 MeV. The data represent new information for the determination of the astrophysical S(E) factor. 
D.Schuermann, A.Di Leva, L.Gialanella, D.Rogalla, F.Strieder, N.De   Cesare, A.D'Onofrio, G.Imbriani, R.Kunz, C.Lubritto, A....