Speaker
Description
The second Short-Range Correlations (SRC) experiment at JINR, performed in 2022, used a 44.8 GeV/c $^{12}C$ beam incident on a liquid-hydrogen target to study hard proton knockout from $^{12}C$ in inverse kinematics. The reaction products were detected with a modified BM@N spectrometer. The experimental setup was optimized for proton–proton scattering near $90^{\circ}$ in the center-of-mass frame, corresponding to a squared four-momentum transfer of approximately 2.5 $GeV/c^2$.
Under these kinematic conditions, the cross section for the $^{12}C(p,2p)^{11}B$ reaction was measured for the first time. The result was compared with single-particle distorted-wave impulse-approximation calculations incorporating well-constrained initial- and final-state interactions within the Glauber framework. The extracted spectroscopic reduction factor, R_s=0.96±0.01(stat.) ±0.05(syst.), is consistent with results from high- $Q^2$ A(e,e'p) measurements. It is, however, significantly larger than the reduced single-particle strengths, R_s=0.6, typically obtained from low-energy quasi-elastic electron- and hadron-induced reactions. This comparison supports a scale-dependent picture of the observed single-particle strength in nuclei.
The ongoing analysis of events with an identified $^{10}B$ residual nucleus searches for exclusive signatures of scattering from short-range-correlated nucleon pairs in $^{12}C$. The event selection is guided by detailed simulations of the SRC signal and relevant background processes. The talk will present the measured quasi-elastic cross section and spectroscopic strength, discuss the observed exclusive event topologies, and report the current status of the SRC-pair knockout analysis.
