Track Reconstruction and GEM Detector Performance in BM@N Experiment

BM@N experiment tracking system consists of Multiwire Proportional Chambers (MWPC), Gas Electron Multiplier (GEM) and Drift Chambers (DCH). It is used for trajectories reconstruction of charged particles. GEM detector is located inside the magnet and plays crucial role in track reconstruction. Algorithm of track reconstruction is described. GEM detector performance (efficiency and spatial resolution) is presented

Triple GEM Tracking Detectors for the BM@N Experiment

BM@N (Baryonic Matter at the Nuclotron) is the fixed target experiment aimed to study nuclear matter in the relativistic heavy ion collisions at the Nuclotron accelerator in JINR. The BM@N tracking system is based on Gas Electron Multipliers (GEM) detectors, mounted inside the BM@N analyzing magnet. The structure of the GEM detectors and the results of study of their characteristics are presented. The GEM detectors are integrated into the BM@N experimental setup and data acquisition system. The results of the first test of the GEM tracking system in the technical run with the deuteron beam are shortly reviewed

Production of {\pi}+ and K+ mesons in argon-nucleus interactions at 3.2 AGeV

First physics results of the BM@N experiment at the Nuclotron/NICA complex are presented on {\pi}+ and K+ meson production in interactions of an argon beam with fixed targets of C, Al, Cu, Sn and Pb at 3.2 AGeV. Transverse momentum distributions, rapidity spectra and multiplicities of {\pi}+ and K+ mesons are measured. The results are compared with predictions of theoretical models and with other measurements at lower energies.Comment: 29 pages, 20 figure

A New Review of Excitation Functions of Hadron Production in pp Collisions in the NICA Energy Range

Data on hadron multiplicities from inelastic proton-proton interactions in the energy range of the NICA collider have been compiled. The compilation includes recent results from the NA61/SHINE and NA49 experiments at the CERN SPS accelerator. New parameterizations for excitation functions of mean multiplicities \left, \left, \left, \left, \left, \left are obtained in the region of collision energies $3<\sqrt{s_{NN}}<31$ GeV. The energy dependence of the particle yields, as well as variation of rapidity and transverse momentum distributions are discussed. A standalone algorithm for hadron phase space generation in pp collisions is suggested and compared to model predictions using an example of the PHQMD generator.Comment: Submitted to PEPAN Letter

PHQMD Model for the Formation of Nuclear Clusters and Hypernuclei in Heavy Ion Collisions

International audienceA new n-body dynamic transport approach, PHQMD (Parton-Hadron-Quantum-Molecular-Dynamics), is used to describe heavy-ion collisions and the formation of clusters and hypernuclei. The first results are presented from using PHQMD to study the rates of production of strange hadrons, nuclear clusters, and hypernuclei in elementary and heavy-ion collisions at NICA energies. The sensitivity of bulk observables toward the hard and soft equations of state in the PHQMD model is investigated

The PHQMD model for the formation of nuclear clusters and hypernuclei in heavy-ion collisions

Modeling of the process of the formation of nuclear clusters in the hot nuclear matter is a challenging task. We present the novel n-body dynamical transport approach - PHQMD (Parton-Hadron-Quantum-Molecular Dynamics) [1] for the description of heavy-ion collisions as well as clusters and hpernuclei formation. The PHQMD extends well established PHSD (Parton-Hadron-String Dynamics) approach - which incorporates explicit partonic degrees-of-freedom (quarks and gluons), an equation-of-state from lattice QCD, as well as dynamical hadronization and hadronic elastic and inelastic collisions in the final reaction phase, by n-body quantum molecular dynamic propagation of hadrons which allows choosing of the equation of state with different compression modulus. The formation of clusters, including hypernuclei, is realized by incorporation the Simulated Annealing Clusterization Algorithm (SACA). We present first results from PHQMD on the study of the production rates of strange hadrons, nuclear clusters and hypernuclei in e1elementary and heavy-ion collisions at NICA energies. In particular, sensitivity on the 'hard' and 'soft' equation of state within the PHQMD model was investigated for 'bulk' observables

BM@N Data Analysis Aimed at Studying SRC Pairs: One-Step Single Nucleon Knockout Measurement in Inverse Kinematics Out of a 48 GeV/c12^{12}C Nucleus

International audienceNucleon knockout reactions with high energy probes are widely used to reveal the inner structure of nuclei, however, they cannot be applied to study unstable nuclei. We recently demonstrated the feasibility to access single particle and short-range correlation (SRC) properties in nuclei with hadronic probes in inverse kinematics, opening the pathway for such studies in short-lived nuclei at upcoming accelerator facilities. The experiment was carried out using the BM@N setup at JINR. A $^{12}$C beam at 4 GeV/c/u impinged on a liquid hydrogen target using a kinematically complete reaction. We show that by selecting the fragment in the $^{{12}}$C($p$,$2p$)$^{{11}}$B reaction, limitations posed by final-state interactions are overcome and single nucleon properties are probed in a single-step knockout reaction. The ground-state distributions are in agreement with theoretical calculations. We probe SRCs in the same way by the break up of SRC pairs in $^{{12}}$C($p$,$2pN$)$^{{10}}$B/$^{{10}}$Be reactions. We not only identify SRCs in such kinematical conditions for the first time but also deduce factorization and other pair properties from direct measurements. The ongoing analysis continues with the study of multi-fragmentation following quasielastic and SRC pair removal, and with 4-fold coincidence events including the recoil neutron being detected. We are also conducting studies to optimize the experimental conditions for the next scheduled beam time in 2021

Large area BM@N GEM detectors

Baryonic Matter at Nuclotron (BM@N) is a fixed target experiment at the NICA accelerator complex in JINR aimed to study nuclear matter in relativistic heavy ion collisions. Detectors based on Gas Electron Multipliers (GEM) are used for the central tracking system of the BM@N experiment, which is located inside the BM@N analyzing magnet. The structure of the GEM detectors and the results of study of their characteristics are presented. The performance of seven GEM detectors integrated into the BM@N experimental setup and data acquisition system is briefly reviewed