scholarly journals Spectra and mean multiplicities of $$\pi ^{-}$$ in central $${}^{40}$$Ar+$${}^{45}$$Sc collisions at 13A, 19A, 30A, 40A, 75A and 150$$A\,\text{ Ge }\text{ V }\!/\!\textit{c}$$ beam momenta measured by the NA61/SHINE spectrometer at the CERN SPS

2021 ◽  
Vol 81 (5) ◽  
Author(s):  
A. Acharya ◽  
H. Adhikary ◽  
K. K. Allison ◽  
E. V. Andronov ◽  
T. Antićić ◽  
...  
Keyword(s):  
Particle Production ◽  
System Size ◽  
Hadronic Matter ◽  
Transverse Mass ◽  
Proton Synchrotron ◽  
Inverse Slope ◽  
Super Proton Synchrotron ◽  
Inverse Slope Parameter ◽  
The Mean ◽  
Momentum Transverse

AbstractThe physics goal of the strong interaction program of the NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) is to study the phase diagram of hadronic matter by a scan of particle production in collisions of nuclei with various sizes at a set of energies covering the SPS energy range. This paper presents differential inclusive spectra of transverse momentum, transverse mass and rapidity of $$\pi ^{-}$$ π -  mesons produced in central$${}^{40}$$ 40 Ar+$${}^{45}$$ 45 Sc collisions at beam momenta of 13A, 19A, 30A, 40A, 75A and 150$$A\,\text{ Ge }\text{ V }\!/\!\textit{c}$$ A Ge V / c . Energy and system size dependence of parameters of these distributions – mean transverse mass, the inverse slope parameter of transverse mass spectra, width of the rapidity distribution and mean multiplicity – are presented and discussed. Furthermore, the dependence of the ratio of the mean number of produced pions to the mean number of wounded nucleons on the collision energy was derived. The results are compared to predictions of several models.

scholarly journals Measurements of $$\pi ^-$$ production in $$^7$$Be + $$^9$$Be collisions at beam momenta from 19A to 150$$A\,\text{ GeV }\!/\!c$$ in the NA61/SHINE experiment at the CERN SPS

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
A. Acharya ◽  
H. Adhikary ◽  
A. Aduszkiewicz ◽  
K. K. Allison ◽  
E. V. Andronov ◽  
...  
Keyword(s):  
Particle Production ◽  
Nucleon Nucleon ◽  
Particle Identification ◽  
Hadronic Matter ◽  
Transverse Mass ◽  
Proton Synchrotron ◽  
Super Proton Synchrotron ◽  
The Mean ◽  
Onset Of Deconfinement ◽  
Formula Method

AbstractThe NA61/SHINE collaboration studies at the CERN Super Proton Synchrotron (SPS) the onset of deconfinement in hadronic matter by the measurement of particle production in collisions of nuclei with various sizes at a set of energies covering the SPS energy range. This paper presents results on inclusive double-differential spectra and mean multiplicities of $$\pi ^{-}$$ π - mesons produced in the 5% most central$$^7$$ 7 Be + $$^9$$ 9 Be collisions at beam momenta of 19A, 30A, 40A, 75A and 150$$A\,\text{ GeV }\!/\!c$$ A GeV / c obtained by the so-called $$h^-$$ h - method which does not require any particle identification. The shape of the transverse mass spectra differs from the shapes measured in central Pb + Pb collisions and inelastic p+p interactions. The normalized width of the rapidity distribution decreases with increasing collision energy and is in between the results for inelastic nucleon–nucleon and central Pb + Pb collisions. The mean multiplicity of pions per wounded nucleon in central$$^7$$ 7 Be + $$^9$$ 9 Be collisions is close to that in central Pb + Pb collisions up to 75$$A\,\text{ GeV }\!/\!c$$ A GeV / c . However, at the top SPS energy the result lies between those for nucleon–nucleon and Pb + Pb interactions. The results are discussed in the context of predictions for the onset of deconfinement at the CERN SPS collision energies.

scholarly journals Measurements of $$\pi ^\pm $$, $$K^\pm $$, p and $$\bar{p}$$ spectra in $$^7$$Be+$$^9$$Be collisions at beam momenta from 19A to 150A $${\mathrm{Ge} \mathrm{V}}\!/\!c$$ with the NA61/SHINE spectrometer at the CERN SPS

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
A. Acharya ◽  
◽  
H. Adhikary ◽  
A. Aduszkiewicz ◽  
K. K. Allison ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Particle Production ◽  
Transverse Mass ◽  
Proton Synchrotron ◽  
Inverse Slope ◽  
Super Proton Synchrotron ◽  
Mass Distributions ◽  
The World ◽  
Rapidity Distributions ◽  
Onset Of Deconfinement

AbstractThe NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) studies the onset of deconfinement in hadron matter by a scan of particle production in collisions of nuclei with various sizes at a set of energies covering the SPS energy range. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions and mean multiplicities of $$\pi ^\pm $$ π ± , $$K^\pm $$ K ± , p and $$\bar{p}$$ p ¯ produced in the 20% most central$$^7$$ 7 Be+$$^9$$ 9 Be collisions at beam momenta of 19A, 30A, 40A, 75A and 150A $${\mathrm{Ge} \mathrm{V}}\!/\!c$$ Ge V / c . The energy dependence of the $$K^\pm $$ K ± /$$\pi ^\pm $$ π ± ratios as well as of inverse slope parameters of the $$K^\pm $$ K ± transverse mass distributions are close to those found in inelastic p+p reactions. The new results are compared to the world data on p+p and Pb+Pb collisions as well as to predictions of the Epos, Urqmd, Ampt, Phsd and Smash models.

scholarly journals Investigating the “kink” plot as a signal of the onset of deconfinement

2018 ◽  
Vol 57 (4) ◽  
Author(s):  
Michał Naskręt
Keyword(s):  
Early Stage ◽  
System Size ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Hadronic Matter ◽  
Proton Synchrotron ◽  
Super Proton Synchrotron ◽  
Central Collisions ◽  
The Mean ◽  
Onset Of Deconfinement

One of the physics goals of the NA61/SHINE collaboration at the CERN Super Proton Synchrotron is to study the phase diagram of hadronic matter. To this end, a series of heavy ion collision measurements are performed. It is believed that above a certain collision energy and system size a phase transition between the hadronic matter and quark–gluon plasma occurs. A number of observables have been developed to determine which of the phases was created at the early stage of the collision. This report discusses the dependence of the ratio of the mean number of produced pions to the mean number of wounded nucleons on the Fermi energy measure. For comparison with other measurements this is often presented in the form of the “kink” plot. This plot is presented enriched with preliminary results for 40Ar+45Sc central collisions at 13A, 19A, 30A, 40A, 75A and 150A GeV/c beam momenta. The results are finally compared to data from other experiments.

Analysis of positive pions obtained in d + C collisions at 4.2AGeV/c

2020 ◽  
Vol 29 (06) ◽  
pp. 2050041
Author(s):  
Imran Khan ◽  
Nabeela Feroz ◽  
Ali Zaman ◽  
Naseeb Ullah
Keyword(s):  
Boltzmann Distribution ◽  
High Energy ◽  
Distribution Functions ◽  
Transverse Mass ◽  
Inverse Slope ◽  
Model Calculations ◽  
Momentum Spectra ◽  
Inverse Slope Parameter ◽  
Transverse Momentum Spectra ◽  
High Energy Collisions

Temperature is an important and commonly used parameter among others to study properties of matter created during high energy collisions of nuclei. Experimental data from JINR and UrQMD (version 3.3p2) model simulations have been used to estimate temperature and other properties of positive pions in collisions of deuteron with carbon nuclei at incident momentum of 4.2[Formula: see text]GeV/[Formula: see text] in this paper. Transverse mass and transverse momentum spectra have been used to get inverse slope parameter/temperature of said particles, with the help of some fitting equations. These equations are referred as Hagedorn Thermodynamic and Boltzmann Distribution functions. Such functions or equations are used to describe particles spectra. Temperature of positive pions has been found to be equal to [Formula: see text] and [Formula: see text][Formula: see text]MeV in experimental and model, respectively, using Hagedorn function. Results from both experimental and model calculations have also been compared with each other and thus most reliable fitting function has been suggested. It is found that Hagedorn Thermodynamic function is the most reliable function to get pions’ temperature in said collision system at given momentum. Similarly, results obtained in this paper have been compared with results from other experiments in the world and worthy conclusions have been reached and reported.

scholarly journals PRODUCTION AND RESCATTERING OF STRANGE BARYONS AT ENERGIES AVAILABLE AT THE CERN SUPER PROTON SYNCHROTRON IN A TRANSPORT MODEL WITH HADRON POTENTIALS

2012 ◽  
Vol 27 (03) ◽  
pp. 1250004 ◽  
Author(s):  
QINGFENG LI ◽  
ZHUXIA LI
Keyword(s):  
Transport Model ◽  
Relativistic Quantum ◽  
Mean Field ◽  
Field Potential ◽  
Heavy Ion ◽  
Transverse Mass ◽  
Proton Synchrotron ◽  
Quantum Molecular Dynamics ◽  
Super Proton Synchrotron ◽  
Strange Baryons

A mean-field potential version of the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model is used to investigate the production of strange (anti-)baryons, especially the Λs and [Formula: see text]s, from heavy ion collisions at SPS energies. It is found that, with the consideration of both formed and pre-formed hadron potentials in UrQMD, the transverse mass and longitudinal rapidity distributions of experimental data of both Λs and [Formula: see text]s can be quantitatively explained fairly well. Our investigation also shows the equal importance of both the production mechanism and the rescattering process of hadrons for the final yield of strange baryons.

scholarly journals Latest Results from the NA61/SHINE Experiment

KnE Energy ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 188 ◽  
Author(s):  
D T Larsen
Keyword(s):  
Critical Point ◽  
Energy Dependence ◽  
System Size ◽  
Beam Momentum ◽  
Strong Interactions ◽  
Proton Synchrotron ◽  
Momentum Range ◽  
Super Proton Synchrotron ◽  
Hadron Spectra ◽  
Onset Of Deconfinement

The NA61/SHINE experiment at the CERN Super Proton Synchrotron is pursuing a rich programme on strong interactions, which covers the study of the onset of deconfinement and aims to discover the critical point of strongly interacting matter by performing an energy and system-size scan over the full CERN SPS beam momentum range. So far the scans of p+p, p+Pb, Be+Be, and Ar+Sc interactions have been completed, samples of Pb+Pb data at three energies have already been taken and Xe+La collisions will be registered this year. Results from the different reactions are now emerging, in particular the energy dependence of hadron spectra and yields as well as fluctuations. This contribution presents status and preliminary results from this effort, as well as an outlook for future extensions of the strong interactions programme.

scholarly journals Particle Production at CBM Energies in a Thermal Model Approach

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
A. Prakash ◽  
P. K. Srivastava ◽  
B. K. Singh
Keyword(s):  
Particle Production ◽  
Center Of Mass ◽  
Baryon Density ◽  
Proton Synchrotron ◽  
Super Proton Synchrotron ◽  
Strongly Interacting ◽  
Particle Ratios ◽  
Main Emphasis ◽  
Total Multiplicity ◽  
Density Regime

The compressed baryonic matter (CBM) experiment planned at the Facility for Antiproton and Ion Research (FAIR) will provide a major scientific effort for exploring the properties of strongly interacting matter in the high baryon density regime. One of the important goals behind such experiment is to precisely determine the equation of state (EOS) for the strongly interacting matter at extremely large baryon density. In this paper, we have used some successful models for RHIC and LHC energies to predict different particle ratios and the total multiplicity of various hadrons in the CBM energy range, that is, from 10 A GeV to 40 A GeV lab energies, which corresponds to 4.43 A GeV and 8.71 A GeV center-of-mass energies. Our main emphasis is to estimate the strange particles enhancement as well as an increase in the net baryon density at CBM experiment. We have also compared the model results with the experimental data obtained at alternating gradient synchrotron (AGS) and super proton synchrotron (SPS).

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