Physics Letters B (Oct 2019)

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

  • 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

Journal volume & issue
Vol. 797

Abstract

Read online

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