Quasi-free proton knockout from 12C on carbon target at 398 MeV/u

• Main Authors: V. Panin, M. Holl, J.T. Taylor, Y. Aksyutina, H. Alvarez-Pol, T. Aumann, C.A. Bertulani, K. Boretzky, C. Caesar, M. Chartier, L.V. Chulkov, D. Cortina-Gil, J. Enders, O. Ershova, H. Geissel, R. Gernhäuser, M. Heil, H.T. Johansson, B. Jonson, A. Kelić-Heil, O. Kiselev, C. Langer, T. Le Bleis, R. Lemmon, T. Nilsson, S. Paschalis, M. Petri, R. Plag, R. Reifarth, D. Rossi, H. Scheit, H. Simon, F. Wamers, H. Weick, C. Wimmer
• Format: Article
• Language: English
• Published: Elsevier 2019-10-01
• Series: Physics Letters B
• Online Access: http://www.sciencedirect.com/science/article/pii/S0370269319305064
• ISSN: 0370-2693

The proton-removal mechanism of the 12C→11B reaction induced on a carbon target via elementary nucleon-nucleon scattering is investigated in exclusive triple-coincidence measurements. The observed two-nucleon angular correlations are found to be consistent with quasi-free scattering of a projectile-like proton off a target-like nucleon. Exclusive cross sections for one-step pp and pn interactions are determined as σpp=17.2(12) mb and σpn=18.2(18), respectively. The extracted quasi-free component amounts up to 58(4)% of the total proton-removal cross section. The results are compared to total proton-removal cross sections obtained from the experiment and eikonal reaction theory. Keywords: Direct nuclear reactions, One-nucleon removal, Quasi-free scattering, Cross sections