A5032691533- Nuclear physics research studies
- Astronomical and nuclear sciences
- Quantum chaos and dynamical systems
- Atomic and Molecular Physics
- Nuclear reactor physics and engineering
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Cold Fusion and Nuclear Reactions
- Quantum Chromodynamics and Particle Interactions
- stochastic dynamics and bifurcation
- Radioactive contamination and transfer
- Statistical Mechanics and Entropy
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Thermodynamics and Statistical Mechanics
- Quantum, superfluid, helium dynamics
- Radioactivity and Radon Measurements
- Nuclear and radioactivity studies
- Astro and Planetary Science
- Neutrino Physics Research
- Radioactive Decay and Measurement Techniques
- Particle accelerators and beam dynamics
- Spectroscopy and Quantum Chemical Studies
- Advanced Chemical Physics Studies
- Muon and positron interactions and applications
- Risk Perception and Management
Université de Caen Normandie
2009-2021
Normandie Université
1993-2021
GANIL
2011-2021
Centre National de la Recherche Scientifique
2011-2021
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2011-2021
Institut de Recherche sur les Lois Fondamentales de l'Univers
2021
Institut National de Physique Nucléaire et de Physique des Particules
2010-2021
Osaka University
2009-2020
Société Française d'Allergologie
2018
EDP Sciences
2018
The fusion process of 48 Ca induced reactions is studied with the two-step model. In this model, devided into two stages: first, sticking stage where projectile and target come to touching point over Coulomb barrier from infinite distance, second, formation di-nucleus formed evolve form spherical compound nucleus point. By use statistical evaporation residue cross sections for different neutron channels are analyzed. From results, optimum given synthesize Z=117 element reactions.
Background: Synthesis of superheavy elements is performed by heavy-ion fusion-evaporation reactions. However, fusion known to be hindered with respect what can observed lighter ions. Thus some delicate ambiguities remain on the mechanism that eventually lead severe discrepancies in calculated formation probabilities coming from different models.Purpose: In present work, we propose a general framework based upon uncertainty analysis hope constraining models.Method: To quantify associated...
We report on the first measurement of fission barrier height in a heavy shell-stabilized nucleus. The 254No is measured to be Bf=6.0±0.5 MeV at spin 15ℏ and, by extrapolation, Bf=6.6±0.9 0ℏ. This information deduced from distribution entry points excitation energy versus plane. same performed for 220Th and only lower limit can determined: Bf(I)>8 MeV. Comparisons with theoretical barriers test theories that predict properties superheavy elements.
The diffusion problem over a saddle is studied using multidimensional Langevin equation. An analytical solution derived for quadratic potential and the probability to pass barrier deduced. A very simple given one-dimensional general scheme shown higher dimensions.
Fusion of heavy ions is largely hindered because the appearance an inner barrier between contact point two colliding nuclei and compound nucleus. But there are still quantitative ambiguities on size role dissipation. In this paper we stress importance neck composite system hindrance fusion nuclei. We show that ``denecking'' process very quick compared to other collective degrees freedom as relative distance. This behavior will change potential seen by distance way its effective initial value...
After a large-scale nuclear accident, local populations face high level of complexity, as their day-to-day life is seriously disrupted by the short and long term consequences event. Affected numerous decisions related to daily trade-offs in order cope with whole range unfamiliar issues associated long-lasting radioactive contamination. This includes choice leave, stay or return contaminated zone. Feedback Chernobyl Fukushima post-accident situations Norway Japan based on results PREPARE...
A two-step model is proposed for the fusion mechanism of massive heavy-ion systems which most unknown part in reaction theory synthesis superheavy elements. It consists approaching phase incident ions and dynamical shape evolution amalgamated system toward spherical compound nucleus. Preliminary results are presented.
The over-passing probability across an inverted parabolic potential barrier is investigated according to the classical and quantal generalized Langevin equations. It shown that, in case, asymptotic value of determined by a single dominant root ``characteristic function,'' it given simple expression. expression for quite general, details dissipation mechanism memory effects enter into only through characteristic equation.
The fusion hindrance in heavy ion collisions is studied the framework of two-center liquid drop model. It appears that neck and radial degrees freedom might both be hampered by an inner potential barrier on their path between contact configuration to compound nucleus. Heavy reactions with without two kinds are classified through systematic calculations. found number much smaller than hindrance, for at small mass-asymmetry parameter $\alpha$ large $\alpha$. In formation a given nucleus, if...
The fusion hindrance, which is also denominated by the term extra-push, studied on mass-symmetric systems use of liquid drop model with two-center parameterization. Following idea that hindrance exists only if barrier (saddle point) located at inner side contact point after overcoming outer Coulomb barrier, reactions in two barriers are overlapped each other determined. It shown there many where does not exist for atomic number projectile or target nucleus Z ⩽ 43, while Z> all fusion-hindered.
The present work investigates the uncertainties in a nuclear liquid-drop model. model parameters, their and correlations, are determined through standard regression analysis that includes statistical treatment of errors adjustment is based on experimental binding energies corrected by Thomas-Fermi shell corrections. then propagated onto observables to reveal reliability predictions insight provided guide further research. Standard extended encompass as well correlations. Strong support for...
In the study of odd-$Z$, even-$N$ nuclei $^{243}\mathrm{Es}$ and $^{249}\mathrm{Md}$, performed at University Jyv\"askyl\"a, fusion-evaporation reactions $^{197}\mathrm{Au}(^{48}\mathrm{Ca},2n)\phantom{\rule{0.16em}{0ex}}^{243}\mathrm{Es}$ $^{203}\mathrm{Tl}(^{48}\mathrm{Ca},2n)\phantom{\rule{0.16em}{0ex}}^{249}\mathrm{Md}$ have been used for first time. Fusion-evaporation residues were selected detected using a gas-filled separator coupled with its focal-plane spectrometer. For...