A5018978783- Nuclear physics research studies
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced NMR Techniques and Applications
- Particle accelerators and beam dynamics
- Astro and Planetary Science
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- Quantum, superfluid, helium dynamics
- Radiopharmaceutical Chemistry and Applications
- Electron and X-Ray Spectroscopy Techniques
- Mass Spectrometry Techniques and Applications
- Nuclear Materials and Properties
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- High-pressure geophysics and materials
- Gamma-ray bursts and supernovae
- Scientific Research and Discoveries
- Ion-surface interactions and analysis
National Centre of Scientific Research "Demokritos"
2015-2024
Institute of Nuclear and Particle Physics
2015-2024
Université Libre de Bruxelles
2020
University of Stuttgart
2020
Institute of Nuclear Physics
2020
University of Jyväskylä
2008-2011
Laboratoire National Henri Becquerel
2011
Institut National de Physique Nucléaire et de Physique des Particules
2011
Centre National de la Recherche Scientifique
2011
GANIL
2011
A new astrophysical reaction rate of 12C(α, γ)16O has been calculated based on our recent determination the E1- and E2-capture cross sections. The R-matrix method applied to describe SE1- SE2-factor functions as well data elastic α scattering β-delayed decay 16N from other experiments. resulting for stellar temperatures T9 = 0.04-10 is presented in both tabular form an analytic expression. temperature dependence was obtained when compared with reported evaluations. associated uncertainties...
The pygmy dipole resonance has been studied in the proton-magic nucleus 124Sn with (α, α'γ) coincidence method at Eα=136 MeV. comparison results of photon-scattering experiments reveals a splitting into two components different structure: one group states which is excited as well (γ, γ') reactions and higher energies only reactions. Calculations self-consistent relativistic quasiparticle time-blocking approximation phonon model are qualitative agreement experimental predict low-lying...
The angular distributions of $\ensuremath{\gamma}$ rays from the ${}^{12}\mathrm{C}(\ensuremath{\alpha},\ensuremath{\gamma}{)}^{16}\mathrm{O}$ reaction have been measured at 20 energy points in range ${E}_{\mathrm{cm}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.95$ to 2.8 MeV. sensitivity present experiment compared previous direct investigations was raised by 1--2 orders magnitude, using an array highly efficient ( $100%$) Ge detectors shielded actively with BGOs, as well high beam...
The absolute cross section of the $^{13}$C($α$,n)$^{16}$O reaction has been measured at E$_α$ = 0.8 to 8.0 MeV with an overall accuracy 4%. precision is needed subtract reliably a background in observation geo-neutrinos, e.g. KamLAND detector.
A new experiment to determine the thermonuclear cross section of 12C(α,γ)16O reaction has been performed in regular kinematics using an intense α-particle beam up 340 μA from Stuttgart DYNAMITRON. For first time, a 4π-germanium-detector setup used measure angular distribution γ rays at all angles simultaneously. It consisted array nine EUROGAM high-purity Ge detectors close geometry, actively shielded individually with bismuth germanate crystals. The 12C targets were isotopically enriched by...
Background: In atomic nuclei, a concentration of electric dipole strength around the particle threshold, commonly denoted as pygmy resonance, may have significant impact on nuclear structure properties and astrophysical scenarios. A clear identification these states this resonance is still under discussion.Purpose: We present an experimental theoretical study isospin character investigation splitting previously observed in experiments $N=82$ nuclei.Method: The has been studied semi-magic...
One of the challenges nuclear astrophysics is understanding observed abundances p-process nuclei. Nucleosynthesis calculations typically employ an extended reaction network involving tens thousands reactions and isotopes. As it impossible to experimentally investigate such a vast number reactions, these rely heavily on cross sections derived from Hauser-Feshbach (HF) theory. To improve predictive power HF theory, important provide updated parameterization incorporated models, validated...
The level densities and $\gamma$-ray strength functions of $^{105,106,111,112}$Cd have been extracted from particle-$\gamma$ coincidence data using the Oslo method. are in very good agreement with known levels at low excitation energy. display no strong enhancement for $\gamma$ energies. However, more low-energy is apparent $^{105,106}$Cd than $^{111,112}$Cd. For energies above $\approx$ 4 MeV, there evidence some extra strength, similar to what has previously observed Sn isotopes. origin...
A new method employing a 12 inch \ifmmode\times\else\texttimes\fi{} \ensuremath{\gamma}-summing single NaI crystal was developed for cross-section measurements of astrophysically relevant capture reactions on medium-mass nuclei. The response function such $4\ensuremath{\pi}$ detector enables the summing all events. As result, peak, so-called sum arises in spectra. Its intensity can be used to obtain cross sections with unknown multiplicities. first determine these multiplicities, which are...
The nuclear level density and the $\ensuremath{\gamma}$-ray strength function have been extracted for $^{89}\mathrm{Y}$ by using Oslo method on $^{89}\mathrm{Y}(p,{p}^{\ensuremath{'}}\ensuremath{\gamma})^{89}\mathrm{Y}$ coincidence data. displays a low-energy enhancement consistent with previous observations in this mass region $(^{93\text{--}98}\mathrm{Mo})$. Shell-model calculations support conclusion that observed is due to strong, $M1$ transitions at high excitation energies. data were...
The cross sections of the ${}^{89}$Y($p,\ensuremath{\gamma}$)${}^{90}$Zr and ${}^{121,123}$Sb($p,\ensuremath{\gamma}$)${}^{122,124}$Te reactions were determined from $\ensuremath{\gamma}$-angular distribution measurements at beam energies 1.6 to 3.4 MeV. In addition, angle-integrated also measured ${E}_{p}=2$, 3, 4, 4.8 MeV for reaction using 4$\ensuremath{\pi}$ $\ensuremath{\gamma}$-summing method. Astrophysical $S$ factors rates deduced sections. Statistical model calculations performed...
A measurement of 74Ge(p,gamma)75As at low proton energies, inside the astrophysically relevant energy region, is important in several respects. The reaction directly as it a bottleneck flow which produces lightest p nucleus 74Se. It also an addition to data set required test reaction-rate predictions and allow improvement global p+nucleus optical potential such calculations. An in-beam experiment was performed, making possible measure range between 2.1 3.7 MeV, for most part window. Angular...
The cross section of the ${}^{88}\mathrm{Sr}(p,\ensuremath{\gamma}{)}^{89}\mathrm{Y}$ reaction was determined by in-beam measurements at energies ${E}_{p}=1.4--5\mathrm{MeV}$ relevant to nucleosynthetic p process. At ${E}_{p}>~3.5\mathrm{MeV},$ \ensuremath{\gamma} angular distributions were obtained using one HPGe detector 80% relative efficiency, whereas ${E}_{p}<~3.5\mathrm{MeV}$ they measured means an array four detectors all shielded with BGO crystals for Compton background supression....
Dipole transitions linking signature partner superdeformed bands in Hg193 have been observed. Measurements of the photon decay branching ratios, taken together with average quadrupole moment measured neighboring nuclei, enable absolute M1 strengths to be determined. From these data, using strong coupling model, we find (gK-gR)K/Q0=-0.14±0.01 (e b)−1, gK=-0.65±0.14 Ω=2.8±0.8. These data are consistent neutron orbital being [512]5/2− as predicted by cranked Woods-Saxon calculations.Received 28...
We present an extensive experimental study of the recently predicted pygmy quadrupole resonance (PQR) in Sn isotopes, where complementary probes were used. In this study, (α,α′γ) and (γ,γ′) experiments performed on 124Sn. both reactions, Jπ=2+ states below excitation energy 5 MeV populated. The E2 strength integrated over full transition densities could be extracted from experiment, while experiment at chosen kinematics strongly favors surface modes because strong α-particle absorption...
As a continuation of systematic study reactions relevant to the astrophysical $p$ process, cross sections $^{74,76}\mathrm{Se}(p,\ensuremath{\gamma})\phantom{\rule{0.3em}{0ex}}^{75,77}\mathrm{Br}$ and $^{82}\mathrm{Se}(p,n)\phantom{\rule{0.3em}{0ex}}^{82}\mathrm{Br}$ have been measured at energies from 1.3 $3.6\phantom{\rule{0.3em}{0ex}}\text{MeV}$ using an activation technique. The results are compared predictions Hauser-Feshbach statistical model calculations NON-SMOKER MOST codes....
Based on the energy spectra and relative transition probabilities 176,178,180Os turned out to be very promising candidates for testing features of critical point symmetry X(5). In order also test absolute predicted in framework X(5) lifetime measurements were performed at Cologne FN tandem accelerator. The lifetimes first 2+ states measured using electronic timing case 178Os with recoil distance Doppler shift (RDDS) technique an 16O-induced fusion evaporation reaction. addition, a...
The nuclear level density and the gamma-ray strength function have been determined for 43Sc in energy range up to 2 MeV below neutron separation using Oslo method with 46Ti(p,alpha)43Sc reaction. A comparison 45Sc shows that of is smaller by an approximately constant factor two. This behaviour well reproduced a microscopical/combinatorial model calculation. showing increase at low energies, feature which has observed several nuclei but still awaits theoretical explanation.