A5004315327- Nuclear Physics and Applications
- Nuclear physics research studies
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Radiation Shielding Materials Analysis
- Graphite, nuclear technology, radiation studies
- Particle physics theoretical and experimental studies
- Radiation Therapy and Dosimetry
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Astronomical and nuclear sciences
- Particle Detector Development and Performance
- Astro and Planetary Science
- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Materials and Properties
- Radioactivity and Radon Measurements
- Advanced Chemical Physics Studies
- Nuclear and radioactivity studies
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Radioactive contamination and transfer
- Muon and positron interactions and applications
- Advanced NMR Techniques and Applications
- Crystallography and Radiation Phenomena
GSI Helmholtz Centre for Heavy Ion Research
2017-2025
Goethe University Frankfurt
2015-2024
Lund University
2024
University of Warsaw
2024
National Centre for Nuclear Research
2024
TU Wien
2016-2023
Facility for Antiproton and Ion Research
2023
University of Edinburgh
2023
European Organization for Nuclear Research
2017-2021
Kurchatov Institute
2021
The neutron time-of-flight facility n_TOF features a white source produced by spallation through 20GeV/c protons impinging on lead target. facility, aiming primarily at the measurement of neutron-induced reaction cross sections, was operating CERN between 2001 and 2004, then underwent major upgrade in 2008. This paper presents detail all characteristics new beam currently available configurations, which correspond to two different collimation systems choices moderator. discussed include...
We present a search for the e+e− decay of hypothetical dark photon, also named U vector boson, in inclusive dielectron spectra measured by HADES p(3.5 GeV) + p, Nb reactions, as well Ar (1.756 GeV/u) KCl reaction. An upper limit on kinetic mixing parameter squared ϵ2 at 90% CL has been obtained mass range MU=0.02–0.55 GeV/c2 and is compared with world data set. For masses 0.03–0.1 GeV/c2, lowered respect to previous results, allowing now exclude large part region favored muon g−2 anomaly....
The energy-dependent cross section of the ^{7}Be(n,α)^{4}He reaction, interest for so-called cosmological lithium problem in big bang nucleosynthesis, has been measured first time from 10 meV to keV neutron energy. challenges posed by short half-life ^{7}Be and low reaction have overcome at n_TOF thanks an unprecedented combination extremely high luminosity good resolution beam new experimental area (EAR2) facility CERN, availability a sufficient amount chemically pure ^{7}Be, specifically...
At the neutron time-of-flight facility n_TOF at CERN a new vertical beam line was constructed in 2014, order to extend experimental possibilities this an even wider range of challenging cross-section measurements interest astrophysics, nuclear technology and medical physics. The design hall based on FLUKA Monte Carlo simulations, aiming maximizing flux, reducing halo minimizing background from neutrons interacting with collimator or back-scattered dump. present paper gives overview relevant...
Employing the Bonn–Gatchina partial wave analysis framework (PWA), we have analyzed HADES data of reaction p(3.5GeV)+p→pK+Λ. This might contain information about kaonic cluster "ppK−" (with quantum numbers JP=0− and total isospin I=1/2) via its decay into pΛ. Due to interference effects in our coherent description data, a hypothetical K‾NN (or, specifically "ppK−") signal need not necessarily show up as pronounced feature (e.g. peak) an invariant mass spectrum like Our PWA includes variety...
We report the application of new elimination Rutherford elastic scattering technique for measurement proton-induced reaction cross sections utilizing stored ions decelerated to astrophysical energies. This approach results in a background reduction factor about 1 order magnitude, enabling first (p, n) section storage ring. Here, channels ^{124}Xe(p,n) and ^{124}Xe(p,γ) have been studied just above neutron threshold energy. The data provide valuable constraints Hauser-Feshbach theory...
We report measurements of electron pair production in elementary p+p and d+p reactions at 1.25 GeV/u with the HADES spectrometer. For first time, pairs were reconstructed for n+p by detecting proton spectator from deuteron breakup. find that yield invariant mass Me+e- > 0.15 GeV/c2 is about an order magnitude larger as compared to p+p. A comparison model calculations demonstrates mechanism not sufficiently described yet. The spectra measured C+C are compatible a superposition collisions,...
Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure stable and exotic oxygen isotopes at ${\mathrm{R}}^{3}\mathrm{B}/\mathrm{LAND}$ setup with incident beam energies range $300--450\text{ }\mathrm{MeV}/\mathrm{u}$. The isotopic chain offers large variation separation that allows quantitative understanding single-particle strength changing isospin asymmetry. provide complementary approach to intermediate-energy one-nucleon...
Beyond iron, a small fraction of the total abundances in Solar System is made proton-rich isotopes, [Formula: see text]-nuclei. The clear understanding their production fundamental challenge for nuclear astrophysics. text]-nuclei constrain nucleosynthesis core-collapse and thermonuclear supernovae. text]-process most established scenario text]-nuclei, which are produced via different photodisintegration paths starting on heavier nuclei. A large effort from physics needed to access relevant...
We report on the measurement of ^{7}Be(n,p)^{7}Li cross section from thermal to approximately 325 keV neutron energy, performed in high-flux experimental area (EAR2) n_TOF facility at CERN. This reaction plays a key role lithium yield big bang nucleosynthesis (BBN) for standard cosmology. The only two previous time-of-flight measurements this did not cover energy window interest BBN, and they showed large discrepancy between each other. was with Si telescope high-purity sample produced by...
We report the first measurement of low-energy proton-capture cross sections $^{124}\mathrm{Xe}$ in a heavy-ion storage ring. ${^{124}\mathrm{Xe}}^{54+}$ ions five different beam energies between 5.5 and 8 AMeV were stored to collide with windowless hydrogen target. The $^{125}\mathrm{Cs}$ reaction products directly detected. interaction are located on high energy tail Gamow window for hot, explosive scenarios such as supernovae x-ray binaries. results serve an important test predicted...
NeuLAND (New Large-Area Neutron Detector) is the next-generation neutron detector for R3B (Reactions with Relativistic Radioactive Beams) experiment at FAIR (Facility Antiproton and Ion Research). detects neutrons energies from 100 to 1000 MeV, featuring a high detection efficiency, spatial time resolution, large multi-neutron reconstruction efficiency. This achieved by highly granular design of organic scintillators: 3000 individual submodules size 5 × 250 cm3 are arranged in 30 double...
We present the first nuclear cross-section measurements of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo stretchy="false">(</a:mo><a:mi mathvariant="normal">p</a:mi><a:mo>,</a:mo><a:mi>γ</a:mi><a:mo stretchy="false">)</a:mo></a:mrow></a:math> and (p,n) reactions on <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"...
We present data on dielectron emission in proton induced reactions a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed GSI. The represent the first high statistics measurement of proton-induced radiation from cold nuclear matter kinematic regime, where strong medium effects are expected. Combined good mass resolution 2%, it is sensitive to changes spectral functions vector mesons, as predicted by models for hadrons rest or small relative momenta. Comparing e+e invariant...
We report on baryon resonance production and decay in proton-proton collisions at a kinetic energy of 3.5 GeV based data measured with HADES. The exclusive channels $ pp \rightarrow np\pi^{+}$ pp\rightarrow pp\pi^{0}$ as well ppe^{+}e^{-}$ are studied simultaneously for the first time. invariant masses angular distributions pion-nucleon systems were compared to simulations model ansatz assuming saturation pion by an incoherent sum baryonic resonances (R < 2 GeV/c2. A very good description...
We discuss the possibility to build a neutron target for nuclear reaction studies in inverse kinematics utilizing storage ring and radioactive ion beams. The proposed is specially designed spallation surrounded by large moderator of heavy water (${\mathrm{D}}_{2}\mathrm{O}$). present resulting spectra their properties as target. possible realizations at different experimental facilities.
Nuclear data in general, and neutron-induced reaction cross sections particular, are important for a wide variety of research fields. They play key role the safety criticality assessment nuclear technology, not only existing power reactors but also radiation dosimetry, medical applications, transmutation waste, accelerator-driven systems, fuel cycle investigations future reactor systems as Generation IV. Applications related to fields study level densities stellar nucleosynthesis....
^{140}Ce(n,γ) is a key reaction for slow neutron-capture (s-process) nucleosynthesis due to being bottleneck in the flow. For this reason, it was measured with high accuracy (uncertainty ≈5%) at n_TOF facility, an unprecedented combination of purity sample and low neutron-sensitivity detectors. The Maxwellian averaged cross section up 40% higher than previously accepted values. Stellar model calculations indicate reduction around 20% s-process contribution Galactic cerium abundance smaller...
We present the analysis of inclusive ${K}^{0}$ production in $p+p$ and $p+\mathrm{Nb}$ collisions measured with HADES detector (GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt) at a beam kinetic energy 3.5 GeV. Data are compared to Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) transport model. The data suggest presence repulsive momentum-dependent kaon potential as predicted by chiral perturbation theory (ChPT). For rest normal nuclear density, ChPT amounts $\ensuremath{\approx}35$ MeV....