A5089332420- Nuclear physics research studies
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Nuclear Materials and Properties
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Astrophysics and Cosmic Phenomena
- Protein Structure and Dynamics
- Particle accelerators and beam dynamics
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Advanced MEMS and NEMS Technologies
- Spectroscopy and Quantum Chemical Studies
- Radiation Detection and Scintillator Technologies
- Magnetic confinement fusion research
- Engineering Applied Research
- Computational Physics and Python Applications
- Nuclear and radioactivity studies
- Boron Compounds in Chemistry
- Lipid Membrane Structure and Behavior
- DNA and Nucleic Acid Chemistry
- Quantum chaos and dynamical systems
University of North Carolina at Chapel Hill
2024-2025
GSI Helmholtz Centre for Heavy Ion Research
2008-2021
Research Association for Combustion Engines
2002-2010
National Agency for New Technologies, Energy and Sustainable Economic Development
1999
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
1997
With a new detector setup and the high-resolution performance of fragment separator FRS at GSI we discovered 57 isotopes in atomic number range 60$\leq Z \leq 78$: \nuc{159-161}{Nb}, \nuc{160-163}{Pm}, \nuc{163-166}Sm, \nuc{167-168}{Eu}, \nuc{167-171}{Gd}, \nuc{169-171}{Tb}, \nuc{171-174}{Dy}, \nuc{173-176}{Ho}, \nuc{176-178}{Er}, \nuc{178-181}{Tm}, \nuc{183-185}{Yb}, \nuc{187-188}{Lu}, \nuc{191}{Hf}, \nuc{193-194}{Ta}, \nuc{196-197}{W}, \nuc{199-200}{Re}, \nuc{201-203}{Os},...
The very neutron-rich oxygen isotopes ${}^{25}$O and ${}^{26}$O are investigated experimentally theoretically. unbound states populated in an experiment performed at the R3B-LAND setup GSI via proton-knockout reactions from ${}^{26}$F ${}^{27}$F relativistic energies around 442 414 MeV/nucleon, respectively. From kinematically complete measurement of decay into ${}^{24}$O plus one or two neutrons, ground-state energy width determined, upper limits for lifetime extracted. In addition, results...
Spallation residues and fission fragments from 1A GeV 238U projectiles irradiating a liquid hydrogen target were investigated by using the fragment separator at GSI for magnetic selection of reaction products including ray-tracing, energy-loss time-of-flight techniques. The longitudinal-momentum spectra identified analyzed, evaporation could be separated. For 1385 nuclides, production cross sections down to values 10 microb with mean accuracy 15%, velocities in uranium rest frame kinetic...
The spallation residues produced in the bombardment of 56}Fe at 1.5, 1.0, 0.75, 0.5 and 0.3 A GeV on a liquid-hydrogen target have been measured using reverse kinematics technique Fragment Separator GSI (Darmstadt). This has permitted full identification charge mass all isotopes with cross-sections larger than 10^{-2} mb down to Z=8. Their individual production recoil velocities five energies are presented. Production compared previously existing data empirical parametric formulas, often...
We present an extensive overview of production cross sections and kinetic energies for the complete set nuclides formed in spallation 136Xe by protons at incident energy 1 GeV per nucleon. The measurement was performed inverse kinematics GSI fragment separator. Slightly below Businaro-Gallone point, is stable nuclide with largest neutron excess. kinematic data collected this work full are a general benchmark modeling process neutron-rich nuclear system, where fission characterized...
Although it is well understood that the graph of free energy unfolding (Δ
The production of light and intermediate-mass nuclides formed in the reaction 1H+238U at 1 GeV was measured Fragment Separator (FRS) GSI, Darmstadt. experiment performed inverse kinematics, shooting a A 238U beam on thin liquid-hydrogen target. 254 isotopes all elements range from Z=7 to Z=37 were unambiguously identified, velocity distributions produced determined with high precision. results show that are very asymmetric binary decay heavy nuclei originating spallation uranium. All...
Production cross sections of medium-mass neutron-rich nuclei obtained in the fragmentation $^{136}\mathrm{Xe}$ projectiles at 1 $A$ GeV have been measured with FRagment Separator (FRS) GSI. The are compared to $^{238}\mathrm{U}$ fission yields and model calculations determine optimum reaction mechanism extend limits chart nuclides around r-process waiting point $N=82$.
The nuclide cross sections and longitudinal velocity distributions of residues produced in the reactions $^{136}\mathrm{Xe}$ $^{124}\mathrm{Xe}$ at $1A$ GeV a lead target were measured high-resolution magnetic spectrometer, fragment separator (FRS) GSI. data cover broad range isotopes elements between $Z=3$ $Z=56$ for $Z=5$ $Z=55$ $^{124}\mathrm{Xe}$, reaching down to few microbarns. exhibit Gaussian shape masses above $A=20$, while more complex behavior is observed lighter masses. isotopic...
Residual fragment production in reactions induced by Xe136 projectiles impinging on a liquid deuterium target at 500A MeV has been measured GSI. Projectile residues were unambiguously identified atomic and mass numbers using the Fragment Separator as high-resolution zero-degree spectrometer. The isotopic yields of these residuals used to benchmark reference model calculations describing spallation reactions. In particular energy dissipated was assessed comparing this work with ones obtained...
Impeded by the complexity of proteinaceous structure and very weak nature noncovalent interactions involved, detailed mechanisms which anions induce salting-in Hofmeister effects in proteins peptides remain unclear. Here, using β-hairpin as models, we examine two approaches to qualify (map) anion binding: 1H NMR chemical shifts hydronium-catalyzed hydrogen–deuterium exchange (HDX) rate changes. We demonstrate that each salt investigated─despite an affinity too quantify accurately, caused...
Spallation reactions on fissile nuclei represent an appropriate tool to investigate dissipative effects in nuclear fission. In this work, we have studied transient and proton- deuteron-induced fission $^{208}\mathrm{Pb}$ at $500A$ MeV. A dedicated experimental setup optimized for inverse kinematics measurements made it possible identify atomic number both fragments with high resolution, reconstruct the charge of fissioning system. We could then determine width distribution as well partial...
The large body of experimental data on nuclear fission is analyzed with a semi-empirical ordering scheme based the macro-microscopic approach and separability compound-nucleus fragment properties path. We apply statistical model to non-equilibrium descent from saddle scission, taking influence dynamics into account by an early freeze-out. present reveals portion common features behind variety complex observations made for different systems.
Strong odd-even staggering (OES) of the yields fragments, produced by fragmenting $^{78}\mathrm{Kr}$ projectiles, has been measured employing combination an in-flight fragment separator and a storage ring. It is shown that OES ${T}_{z}=\ensuremath{-}1/2$ ${T}_{z}=1/2$ mirror nuclei critically depends on both pairing shell structure, especially at closed shells $Z=20$ 28. A comparison relative particle-emission threshold energies reveals unambiguously origin mainly determined energies, which...
Production cross-sections and longitudinal velocity distributions of the projectile-like residues produced in reactions 112Sn + 124Sn both at an incident beam energy 1 AGeV were measured with high-resolution magnetic spectrometer, Fragment Separator (FRS) GSI. For characteristics nuclide production cross sections determined for atomic number Z $\geq$ 10. A comparison results two is presented.
Total cross sections for proton- and deuteron-induced-fission of ${}^{208}$Pb ${}^{238}$U have been determined in the energy range between 500 MeV 1 GeV. The experiment has performed inverse kinematics at GSI Darmstadt, facilitating counting projectiles identification reaction products. High precision 5$%$ 7$%$ achieved by individually beam particles registering both fission fragments coincidence with high efficiency full $Z$ resolution. Fission was clearly distinguished from other channels....
Background: Fragment yields exhibit a strong odd-even staggering (OES). This OES has been experimentally observed in different fragmentation reactions with projectile-target combinations. However, the experimental data are still scarce for fragments close to drip lines and origin of this is not well understood. Purpose: More needed explore fragment validate reaction models, especially nuclei lines. To study pronounced near proton line, we measured Tz=−1 Tz=−3/2 over wide range mass number....