P. Rodríguez-Ramos
A5051156229- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Nuclear reactor physics and engineering
- Geological and Geochemical Analysis
- Stochastic processes and statistical mechanics
- Particle Detector Development and Performance
- Geochemistry and Geologic Mapping
- Superconducting Materials and Applications
- Pulsars and Gravitational Waves Research
Institute of Nuclear Physics
2025
Czech Academy of Sciences, Nuclear Physics Institute
2015-2024
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2019-2021
Institute of Physics of the Slovak Academy of Sciences
2017-2019
Slovak Academy of Sciences
2017-2019
Czech Technical University in Prague
2014-2016
We present an analysis of proton number fluctuations in $\sqrt{s_{NN}}$ = 2.4 GeV Au+Au collisions measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI. With help extensive detector simulations done IQMD transport model events including nuclear clusters, various nuisance effects influencing observed cumulants have been investigated. Acceptance and efficiency corrections applied as a function fine grained rapidity transverse momentum bins, well considering local track...
Flow coefficients $v_{n}$ of the orders $n = 1 - 6$ are measured with High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons and tritons as a function centrality, transverse momentum rapidity in Au+Au collisions $\sqrt{s_{NN}} 2.4$ GeV. Combining information from flow all allows to construct first time, collision energies few GeV, multi-differential picture angular emission pattern these particles. It reflects complicated interplay between effect central fireball...
Abstract High-precision measurements of flow coefficients $$v_{n}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>v</mml:mi> <mml:mi>n</mml:mi> </mml:msub> </mml:math> ( $$n = 1 - 4$$ <mml:mrow> <mml:mo>=</mml:mo> <mml:mn>1</mml:mn> <mml:mo>-</mml:mo> <mml:mn>4</mml:mn> </mml:mrow> ) for protons, deuterons and tritons relative to the first-order spectator plane have been performed in Au+Au collisions at $$\sqrt{s_{_{{\text {NN}}}}}= 2.4$$ <mml:msqrt>...
We present data on charged kaons (K+-) and {\phi} mesons in Au(1.23A GeV)+Au collisions. It is the first simultaneous measurement of K central heavy-ion collisions below a kinetic beam energy 10A GeV. The {\phi}/K- multiplicity ratio found to be surprisingly high with value 0.52 +- 0.16 shows no dependence centrality collision. Consequently, different slopes K+ K- transverse-mass spectra can explained solely by feed- down, which substantially softens mesons. Hence, contrast commonly adapted...
We present first data on sub-threshold production of K0 s mesons and Λ hyperons in Au+Au collisions at $\sqrt{s_{NN}}$ = 2.4 GeV. observe an universal scaling hadrons containing strangeness, independent their corresponding thresholds. Comparing the yields, scaling, shapes rapidity pt spectra to state-of-the-art transport model (UrQMD, HSD, IQMD) predictions, we find that none latter can simultaneously describe all observables with reasonable \c{hi}2 values.
We present the first observation of K^{-} and ϕ absorption within nuclear matter by means π^{-}-induced reactions on C W targets at an incident beam momentum 1.7 GeV/c studied with HADES SIS18/GSI. The double ratio (K^{-}/K^{+})_{W}/(K^{-}/K^{+})_{C} is found to be 0.319±0.009(stat)_{-0.012}^{+0.014}(syst) indicating a larger in heavier as compared lighter ones. measured ϕ/K^{-} ratios π^{-}+C π^{-}+W acceptance are equal 0.55±0.04(stat)_{-0.07}^{+0.06}(syst)...
A feasibility study has been performed in order to investigate the performance of HADES detector measure electromagnetic decays hyperon resonances $\Sigma(1385)^0$, $\Lambda(1405)$ and $\Lambda{\Lambda}(1520)$ as well production double strange baryon systems $\Xi^-$ $\Lambda\Lambda$ p+p reactions at a beam kinetic energy 4.5 GeV. The existing will be upgraded by new Forward Detector, which extends acceptance into range polar angles that plays crucial role for these investigations. analysis...
We report on the investigation of $\mathrm{\ensuremath{\Delta}}$(1232) production and decay in proton-proton collisions at a kinetic energy 1.25 GeV measured with HADES. Exclusive dilepton channels $pp{e}^{+}{e}^{\ensuremath{-}}$ $pp{e}^{+}{e}^{\ensuremath{-}}\ensuremath{\gamma}$ have been studied compared partial-wave analysis hadronic $pp{\ensuremath{\pi}}^{0}$ channel. They allow to access both...
We present high-statistic data on charged pion emission from Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 2.4 GeV (corresponding to $E_{beam}$ 1.23 A GeV) in four centrality classes the range 0 - 40$\%$ of most central collisions. The are analyzed as a function transverse momentum, mass, rapidity, and polar angle. Pion multiplicity per participating nucleon decreases moderately with increasing centrality. angular distributions found be non-isotropic even for event class. Our results fit well...
High-statistics $\pi^-\pi^-$ and $\pi^+\pi^+$ femtoscopy data are presented for Au+Au collisions at $\sqrt{s_\mathrm{NN}}=2.4$ GeV, measured with HADES SIS18/GSI. The experimental correlation functions allow the determination of space-time extent corresponding emission sources via a comparison to models. source, parametrized as three-dimensional Gaussian distribution, is studied in dependence on pair transverse momentum, azimuthal angle respect reaction plane, collision centrality beam...
We investigate identical pion HBT intensity interferometry in central Au + collisions at 1.23A GeV. High-statistics π−π− and π+π+ data are measured with HADES SIS18/GSI. The radius parameters, derived from the correlation function depending on relative momenta longitudinally comoving system parametrized as three-dimensional Gaussian distribution, studied of transverse momentum. A substantial charge-sign difference source radii is found, particularly pronounced low extracted parameters agree...
Pion-induced reactions provide unique opportunities for an unambiguous description of baryonic resonances and their coupling channels by means a partial-wave analysis. Using the secondary pion beam at SIS18, two-pion production in second resonance region has been investigated to unravel role $N(1520){\frac{3}{2}}^{\ensuremath{-}}$resonance intermediate $\ensuremath{\rho}$-meson production. Results on exclusive with one (${\ensuremath{\pi}}^{\ensuremath{-}}p$) two pions...
Abstract Hadron production ( $$\pi ^\pm $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> , proton, $$\Lambda <mml:mi>Λ</mml:mi> $$K_S^0$$ <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> $$K^\pm ) in ^- + \textrm{C}$$ <mml:mrow> <mml:mo>-</mml:mo> <mml:mo>+</mml:mo> <mml:mtext>C</mml:mtext> </mml:mrow> and \textrm{W}$$ <mml:mtext>W</mml:mtext> collisions is investigated...
We report on the investigation of dielectron production in tagged quasi-free neutron-proton collisions by using a deuteron beam kinetic energy 1.25GeV/u impinging liquid hydrogen target. Our measurements with HADES confirm significant excess $e^{+}e^{-}$ pairs above $\pi^{0}$ mass exclusive channel $dp \rightarrow npe^{+}e^{-}(p_{spect})$ as compared to $ ppe^{+}e^{-}$ measured proton-proton at same energy. That points different bremsstrahlung mechanisms. Two models were evaluated for role...
The HADES collaboration uses the e + − production as a probe of resonance matter produced in collisions at incident energies 1-3.5 GeV/nucleon GSI. Elementary reactions provide useful references for these studies and give information on Dalitz decays (R→Ne ). Such processes are sensitive to structure time-like electromagnetic baryon transitions kinematic range where (off-shell) vector mesons play crucial role. Results obtained proton-proton commissioning pion-beam experiment reported...
In this letter we report the first multi-differential measurement of correlated pion-proton pairs from 2 billion Au+Au collisions at sNN=2.42 GeV collected with HADES. energy regime population Δ(1232) resonances plays an important role in way is distributed between intrinsic excitation and kinetic hadrons fireball. The triple differential d3N/dMπ±pdpTdy distributions π±p have been determined by subtracting πp combinatorial background using iterative method. invariant-mass mass region show...
The HADES spectrometer currently operating on the beam of SIS18 accelerator in GSI will be moved to a new position CBM cave future FAIR complex. Electromagnetic calorimeter (ECAL) enable HADES@FAIR experiment measure data neutral meson production heavy ion collisions at energy range 2-10 A GeVon SIS100. Calorimeter based 978 massive lead glass modules read out by photomultipliers and novel front-end electronics. Secondary gamma with energies ranging from 81 MeV up 1399 MAMI-C Mainz facility...
Electromagnetic calorimeter (ECAL) is being developed to complement dilepton spectrometer HADES. ECAL will enable the HADES@FAIR experiment measure data on neutral meson production in heavy ion collisions at energy range of 2-10 AGeV beam future accelerator SIS100@FAIR. We report results last test with quasi-monoenergetic photons carried out MAMI facility Johannes Gutenberg Universität Mainz.
First information on the timelike electromagnetic structure of baryons in second resonance region has been obtained from measurements invariant mass and angular distributions quasi-free reaction $\pi^- p \to nee$ at $\sqrt{s_{\pi^- p}}$ = 1.49 GeV with High Acceptance Di-Electron Spectrometer (HADES) detector GSI using pion beam impinging a CH$_2$ target. We find total cross section $\sigma (\pi^- nee) 2.97 \pm 0.07^{data} 0.21^{acc} 0.31^{\rm{Z}_{\rm{eff}}} \mu$b. Combined Partial Wave...
Hadron production ($\pi^\pm$, proton, $\Lambda$, $K_S^0$, $K^\pm$) in $\pi^- + \mathrm{C}$ and \mathrm{W}$ collisions is investigated at an incident pion beam momentum of $1.7~\mathrm{GeV}/c$. This comprehensive set data measured with HADES SIS18/GSI significantly extends the existing world on hadron induced reactions provides a new reference for models that are commonly used interpretation heavy-ion collisions. The inclusive differential cross-sections compared state-of-the-art transport...