Speaker
Description
The fixed-target BM@N experiment at Nuclotron is a part of the NICA facility at JINR (Dubna, Russia). It studies dense baryonic matter with light and heavy ion beams with the kinetic energies of 2–6~GeV per nucleon. Since 2017, the BM@N physics program has included investigations of Short-Range Correlations (SRC), short-lived fluctuations of nucleon pairs where two nucleons have high relative and low center-of-mass momenta.
The first SRC measurement in 2018 at JINR with a carbon beam 48 GeV/c and a liquid hydrogen target focused on the hard quasi-elastic scattering reaction $^{12}\mathrm{C}(p,2p)X$, $X=\ ^{11}\mathrm{B}, ^{10}\mathrm{B}, ^{10}\mathrm{Be}$. The data revealed 25 SRC-pair knockout events and demonstrated that an intact $^{11}\mathrm{B}$ in the final state indicates suppressed rescattering in initial- and final-state interactions.
The second experiment in 2022 used an upgraded detector system with a hadron calorimeter in the two-arm spectrometer and improved scintillation counters. A laser-based calibration system enabled timing adjustment of all counters, which in turn made it possible to apply detailed corrections. Here we discuss a series of corrections aimed to improve the time and
amplitude response of the beam scintillation counters. These corrections allowed to minimize the influence of non-uniform light collection on amplitude resolution, and to achieve final time resolution of approximately 50 ps.
