Probing QFS mechanism with the 12C(p, 2p)11B reaction in inverse kinematics
Journal article, 2026
The reaction mechanism of the quasi-free scattering (QFS) reaction 12C( p , 2 p )11B is investigated in inverse and complete kinematics using a 12C beam at 400 MeV/nucleon impinging on a polyethylene (CH2) target. A complete set of kinematic observables characterizing the three-body final state is obtained through the exclusive reconstruction of the 11B recoil fragment and the two outgoing protons. For the first time, a systematic Treiman-Yang test is applied to inverse-kinematics ( p , 2 p ) reactions with a heavy-ion beam, taking advantage of the large phase space covered by the experimental setup, particularly in non-coplanar kinematic configuration. This model-independent test confirms the predominance of the QFS reaction mechanism. The characteristic dependence of the Treiman-Yang angle on the azimuthal correlation of the outgoing protons, along with other kinematic signatures, provides further evidence for the single-step proton knockout process.
Nucleon knockout
Quasi-free scattering
Treiman-Yang test
Author
V. Panin
Helmholtz Association of German Research Centres
Technische Universität Darmstadt
M. Holl
Technische Universität Darmstadt
J. T. Taylor
University of Liverpool
Y. Aksyutina
Helmholtz Association of German Research Centres
H. Alvarez-Pol
University of Santiago de Compostela (USC)
T. Aumann
Helmholtz Association of German Research Centres
Technische Universität Darmstadt
C.A. Bertulani
Helmholtz Association of German Research Centres
Texas A&M University
K. Boretzky
Helmholtz Association of German Research Centres
C. Caesar
Technische Universität Darmstadt
M. Chartier
University of Liverpool
L. V. Chulkov
National Research Centre "Kurchatov Institute"
D. Cortina-Gil
University of Santiago de Compostela (USC)
J. Enders
Technische Universität Darmstadt
Helmholtz Association of German Research Centres
O. Ershova
Goethe University Frankfurt
H. Geissel
Helmholtz Association of German Research Centres
R. Gernhäuser
Technical University of Munich
M. Heil
Helmholtz Association of German Research Centres
Håkan T Johansson
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
Björn Jonson
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
A. Kelić-Heil
Helmholtz Association of German Research Centres
C. Langer
Goethe University Frankfurt
T. Le Bleis
Technical University of Munich
R.C. Lemmon
Cockcroft Institute
Thomas Nilsson
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
O. Kiselev
Helmholtz Association of German Research Centres
S. Paschalis
University of York
Technische Universität Darmstadt
M. Petri
Technische Universität Darmstadt
University of York
R. Plag
Helmholtz Association of German Research Centres
R. Reifarth
Goethe University Frankfurt
D. Rossi
Technische Universität Darmstadt
Helmholtz Association of German Research Centres
H. Scheit
Technische Universität Darmstadt
H. Simon
Helmholtz Association of German Research Centres
F. Wamers
Technische Universität Darmstadt
Helmholtz Association of German Research Centres
H. Weick
Helmholtz Association of German Research Centres
C. Wimmer
Goethe University Frankfurt
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
0370-2693 (ISSN)
Vol. 879 140595Subject Categories (SSIF 2025)
Subatomic Physics
DOI
10.1016/j.physletb.2026.140595