M. Hartmann
A5050598427- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Neutrino Physics Research
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Psychoanalysis and Psychopathology Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Atomic and Molecular Physics
- Seismic Imaging and Inversion Techniques
- Underwater Acoustics Research
- Advanced Data Storage Technologies
- Radiation Detection and Scintillator Technologies
- Stochastic processes and statistical mechanics
- Particle accelerators and beam dynamics
- French Literature and Criticism
- Quantum, superfluid, helium dynamics
Université Paris-Saclay
2023-2025
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2022-2025
Institut National de Physique Nucléaire et de Physique des Particules
2023-2025
Centre National de la Recherche Scientifique
2023-2025
Lettres, arts du spectacle, langues romanes
2009-2024
École Polytechnique Fédérale de Lausanne
2023
Paul Scherrer Institute
2023
Saarland University
2022
Forschungszentrum Jülich
2008-2020
Institute for Theoretical and Experimental Physics
2010
The production of phi mesons in the collisions 2.83 GeV protons with C, Cu, Ag, and Au at forward angles has been measured via -> K+K- decay using COSY-ANKE magnetic spectrometer. meson cross section follows a target mass dependence A^0.56+/-0.02 momentum region 0.6-1.6 GeV/c. comparison data model calculations suggests that in-medium width is about an order magnitude larger than its free value.
The pp->pp phi reaction has been studied at the Cooler Synchrotron COSY-Juelich, using internal beam and ANKE facility. Total cross sections have determined three excess energies epsilon near production threshold. differential section closest to threshold epsilon=18.5 MeV exhibits a clear S-wave dominance as well noticeable effect due proton-proton final state interaction. Taken together with data for pp omega-production, significant enhancement of phi/omega ratio factor 8 is found compared...
The differential and total cross sections for kaon pair production in the pp->ppK+K- reaction have been measured at three beam energies of 2.65, 2.70, 2.83 GeV using ANKE magnetic spectrometer COSY-Juelich accelerator. These near-threshold data are separated into pairs arising from decay phi-meson remainder. For non-phi selection, ratio terms K-p K+p invariant masses is strongly peaked towards low masses. This effect can be described quantitatively by a simple ansatz final state...
The production of $\ensuremath{\varphi}$ mesons in proton collisions with C, Cu, Ag, and Au targets has been studied via the $\ensuremath{\varphi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ decay at an incident beam energy 2.83 GeV using ANKE detector system COSY. For first time, momentum dependence nuclear transparency ratio, in-medium width, differential cross section for $\ensuremath{\varphi}$-meson forward angles have determined these over range 0.6--1.6 GeV/$c$. There are...
The quasifree $pn\ensuremath{\rightarrow}d\ensuremath{\phi}$ reaction has been studied at the Cooler Synchrotron COSY---J\"ulich, using internal proton beam incident on a deuterium cluster-jet target and detecting fast deuteron in coincidence with ${K}^{+}{K}^{\ensuremath{-}}$ decay of $\ensuremath{\phi}$ meson. energy dependence total differential cross sections are extracted for excess energies up to 80 MeV by determining Fermi momentum neutron an event-by-event basis. Though these...
Differential and total cross sections for the pp -> ppK+K- reaction have been measured at a proton beam energy of 2.83 GeV using COSY-ANKE magnetic spectrometer. Detailed model descriptions fitted to variety one-dimensional distributions permit separation phi section from that non-phi production. The differential spectra show higher partial waves represent majority an excess 76 MeV, whose dependence would then seem require some s-wave phi-p enhancement near threshold. data can be described...
The pp -> ppK+K- reaction was measured below the phi threshold at a beam energy of 2.568 GeV using COSY-ANKE magnetic spectrometer. By assuming that four-body phase space is distorted only by product two-body final state interactions, fits to variety one-dimensional distributions permit evaluation differential and total cross sections. shapes in Kp Kpp invariant masses are reproduced if K-p interaction even stronger than found higher energy. cusp effect K+K- distribution K0K0bar much more...
The vector and tensor polarizations of a deuteron beam have been measured using elastic deuteron-carbon scattering at 75.6 MeV deuteron-proton 270 MeV. After acceleration to 1170 inside the COSY ring, deuterons were checked by studying variety nuclear reactions cluster target ANKE magnet spectrometer placed an internal position storage ring. All these measurements consistent with absence depolarization during provide number secondary standards that can be used in subsequent experiments facility.
Measurements of the $\mathit{pd}\ensuremath{\rightarrow}{p}_{\text{sp}}{\mathit{dK}}^{+}{K}^{\ensuremath{-}}$ reaction, where ${p}_{\text{sp}}$ is a spectator proton, have been undertaken at Cooler Synchrotron COSY-J\"ulich by detecting fast deuteron in coincidence with ${K}^{+}{K}^{\ensuremath{-}}$ pair ANKE facility. Although proton beam energy was fixed, moving target neutron allowed values nonresonant quasifree $\mathit{pn}\ensuremath{\rightarrow}{\mathit{dK}}^{+}{K}^{\ensuremath{-}}$...
The production of the Sigma+ hyperon through pp->K+nSigma+ reaction has been investigated at four energies close to threshold, 1.826, 1.920, 1.958, and 2.020 GeV. At low energies, correlated K+pi+ pairs can only originate from so that their measurement allows total cross section for be determined. results obtained are completely consistent with values extracted study K+-proton correlation spectra in same experiment. These spectra, as well inclusive K+ momentum distributions, also provide...
The unpolarised differential cross section and the two deuteron tensor analysing powers A xx yy of $$\vec dp \to \{ pp\} _s n$$ charge-exchange reaction have been measured with ANKE spectrometer at COSY storage ring. Using beams energies 1.2, 1.6, 1.8, 2.27GeV, data were obtained for small momentum transfers to a {pp} s system low excitation energy. results three lower are consistent impulse approximation predictions based upon current knowledge neutron-proton amplitudes. However, where...
A study of the deuteron breakup reaction $pd \to (pp)n$ with forward emission a fast proton pair small excitation energy $E_{pp}<$ 3 MeV has been performed at ANKE spectrometer COSY--J\"ulich. An exclusive measurement was carried out six proton--beam energies $T_p=$~0.6,~0.7,~0.8,~0.95,~1.35, and 1.9 GeV by reconstructing momenta two protons. The differential cross section reaction, averaged up to $8^{\circ}$ over cm polar angle total momentum $pp$ pairs, obtained. Since kinematics this...
The reaction $pp\ensuremath{\rightarrow}d{K}^{+}{\overline{K}}^{0}$ has been investigated at an excess energy of $Q=46\text{ }\mathrm{M}\mathrm{e}\mathrm{V}$ above the ${K}^{+}{\overline{K}}^{0}$ threshold with ANKE cooler synchrotron COSY-J\"ulich. From detected coincident $d{K}^{+}$ pairs, about 1000 events a missing ${\overline{K}}^{0}$ were identified, corresponding to total cross section...
The cross sections for the pp→ppK+K− reaction were measured at three beam energies 2.65, 2.70, and 2.83 GeV COSY-ANKE facility. shape of K+K− spectrum low invariant masses largely reflects importance KK¯ final state interactions. It is shown that these data can be understood in terms an elastic rescattering plus a contribution coming from production K0K¯0 pair followed by charge-exchange rescattering. Though are not yet sufficient to establish size cusp threshold, mass behaviour suggests...
The effective removal of surface multiples is critical for imaging subsalt structures in the deepwater Gulf Mexico. widely used 2D surface‐related multiple elimination (SRME) inadequate rugose reflectors. We extend SRME methodology to three dimensions through construction high density and wide azimuth data. demonstrate success our method with results from a case study.
In order to establish links between p-wave pion production in nucleon-nucleon collisions and low energy three-nucleon scattering, an extensive programme of experiments on is currently underway at COSY-ANKE. The final proton pair detected very excitation energy, leading S-wave diproton, denoted here as {pp}_s. We now report measurements the differential cross section analysing power pol{p}p->{pp}_s pi^0$ reaction 353 MeV. Both observables can be described terms s- d-wave and, by using phase...
A value for the mass of eta meson has been determined at COSY-ANKE facility through measurement a set deuteron laboratory beam momenta and associated 3He center-of-mass in d+p -> 3He+X reaction. The was then identified by missing-mass peak production threshold determined. individual were fixed with relative precision 3 x 10^-5 values around GeV/c using polarized inducing an artificial depolarizing spin resonance, which occurs well-defined frequency. final-state two-body 3He+eta reaction...