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The experimental evidence points to the existence, at short distances, of strongly correlated neutron-proton pairs much like they are in the deuteron or in free sca0ering processes. As it moves through the nuclear medium, a “bare” nucleon in the presence of the nucleon- nucleon interacton becomes “dressed” in a quasi-deuteron cloud, about 20% of the time [1]. A phenomenological analysis [2] of the quenching of spectroscopic factors and recent data from JLAB [3] points to an isospin dependence of the independent-particle model content in a dressed nucleon. It is expected that this dependence should also be reflected in the dressed amplitude and thus, in the virtual quasi-deuteron content in the ground state. Following from the qualitatve arguments above, quasi-free sca0ering (QFS) of deuterons for which the fast reacton time tR becomes comparable to the time scale of the virtual excitatons, 𝑡!~ℏ/Δ𝐸, could offer a sensitve probe to examine these concepts. In this contributon, we will discuss these ideas within a single-j approximaton and put forward an experimental case that can serve as a template to test the above conjecture, i.e., measuring the (p,pd) QFS cross-secton for knocking out a deuteron in 10,14,16C rela2ve to 12C as an additonal tool to probe short-range correlatons and their isospin dependency.
This work was supported by the Royal Society, UK STFC and the Laboratory Directed Research and Development Program of Oak Ridge Natonal Laboratory, managed by UT-BaTelle, LLC, for the US Department of Energy.
[1] K. Brueckner, in Proceedings of the Rutherford Jubilee Int. Conf. Manchester 1961 (Heywood &Company LTD, London, 1961)
[2] S. Paschalis, M. Petri, A.O. Macchiavelli, O. Hen, and E. Piasetzky, Physics LeTers B 800 (2020) 135110
[3] M. Duer, et al., Nature 560 (2018) 617
