Interplay of dynamical and structure effects in the observables for 12C(p,2p) near 400 MeV with polarized and unpolarized beams

Mecca, A.; Cravo, E.; Deltuva, A.; Crespo, R.; Cowley, A. A.; Arriaga, A.; Wiringa, R. B.; Noro, T.

doi:10.1016/j.physletb.2019.134989

Title: Interplay of dynamical and structure effects in the observables for 12C(p,2p) near 400 MeV with polarized and unpolarized beams

Journal Article · Fri Nov 01 00:00:00 EDT 2019 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2019.134989· OSTI ID:1567912

Mecca, A.;

;

; Cowley, A. A.;

; Wiringa, R. B.; Noro, T.

We investigate the interplay of reaction mechanism and structure effects in the calculated cross sections and polarization observables for the direct ¹²C(p,2p) reaction at 400 MeV around the Quasi Free Scattering (QFS) kinematical condition. We do the first consistent comparison between the scattering observables obtained from solving the three-body Faddeev/Alt-Grassberger-Sandhas (F/AGS) equations and using the Distorted-Wave Impulse Approximation (DWIA). We explore structure effects on the calculated observables, making use of one-nucleon spectroscopic overlaps obtained from the quantum Monte Carlo (QMC) many-body wave functions and using a Woods-Saxon parametrization with parameters adjusted to experimental (p, 2p) data. We show, for the first time, that the two reaction formalisms appear to exhibit a distinct behavior depending upon the kinematic conditions. We also show that the agreement between the experimental data and the theoretical results depends on the reaction formalism, kinematical conditions and optical model parametrizations in addition to the spectroscopic factors (SFs). The agreement between the data and predictions using QMC wave functions diminishes prominently for transitions to excited states of ¹¹B.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Fundacao para a Ciencia ea Tecnologia of Portugal; Alexander von Humboldt Foundation; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC)