L. Olivier
A5035847356- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Nuclear reactor physics and engineering
- Astronomical and nuclear sciences
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Chemical Physics Studies
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Rare-earth and actinide compounds
- Particle physics theoretical and experimental studies
- Crystal Structures and Properties
- Advanced Data Storage Technologies
- High-pressure geophysics and materials
- Astro and Planetary Science
- Advanced NMR Techniques and Applications
- Neutrino Physics Research
- Advanced Condensed Matter Physics
- Distributed and Parallel Computing Systems
- Nuclear Materials and Properties
- Magnetic and transport properties of perovskites and related materials
- Luminescence Properties of Advanced Materials
- Chemical Thermodynamics and Molecular Structure
- Medical Imaging Techniques and Applications
Universidade Federal do Ceará
2024
Institut de Physique
1995-2022
Institut National de Physique Nucléaire et de Physique des Particules
1995-2022
Centre National de la Recherche Scientifique
1996-2022
Université Paris-Saclay
2017-2022
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2021
Laboratoire de Physique Corpusculaire de Caen
2020
École Nationale Supérieure d'Ingénieurs de Caen
2020
Université Paris-Sud
2017-2019
Université Paris Cité
2018-2019
We report on the measurement of first 2(+) and 4(+) states (66)Cr (70,72)Fe via in-beam γ-ray spectroscopy. The nuclei interest were produced by (p,2p) reactions at incident energies 260 MeV/nucleon. experiment was performed Radioactive Isotope Beam Factory, RIKEN, using DALI 2γ-ray detector array novel MINOS device, a thick liquid hydrogen target combined with vertex tracker. A low-energy plateau 2(1)(+) 4(1)(+) as function neutron number observed for N≥38 N≥40 even-even Cr Fe isotopes,...
In-beam γ-ray spectroscopy of ^{79}Cu is performed at the Radioactive Isotope Beam Factory RIKEN. The nucleus interest produced through proton knockout from a ^{80}Zn beam 270 MeV/nucleon. level scheme up to 4.6 MeV established for first time and results are compared Monte Carlo shell-model calculations. We do not observe significant feeding excited states below 2.2 MeV, which indicates that Z=28 gap N=50 remains large. show can be described in terms valence outside ^{78}Ni core, implying...
The first measurement of the low-lying states neutron-rich ^{110}Zr and ^{112}Mo was performed via in-beam γ-ray spectroscopy after one proton removal on hydrogen at ∼200 MeV/nucleon. 2_{1}^{+} excitation energies were found 185(11) keV in ^{110}Zr, 235(7) ^{112}Mo, while R_{42}=E(4_{1}^{+})/E(2_{1}^{+}) ratios are 3.1(2), close to rigid rotor value, 2.7(1), respectively. These results compared modern energy density functional based configuration mixing models using Gogny Skyrme effective...
We report on the first γ-ray spectroscopy of low-lying states in neutron-rich 98,100Kr isotopes obtained from 99,101Rb(p,2p) reactions at ∼220 MeV/nucleon. A reduction 2+1 state energies beyond N=60 demonstrates a significant increase deformation, shifted neutron number compared to sharper transition observed strontium and zirconium isotopes. State-of-the-art beyond-mean-field calculations using Gogny D1S interaction predict level good agreement with experimental results. The identification...
$\ensuremath{\gamma}$-ray transitions between low-spin states of the neutron-rich $^{84,86,88}\mathrm{Ge}$ were measured by means in-flight spectroscopy at 270 MeV/u. Excited ${6}_{1}^{+},\phantom{\rule{0.16em}{0ex}}{4}_{1,2}^{+}$, and ${2}_{1,2}^{+}$ $^{84,86}\mathrm{Ge}$ ${4}_{1}^{+}$ $^{88}\mathrm{Ge}$ observed. Furthermore, a candidate for ${3}_{1}^{+}$ state $^{86}\mathrm{Ge}$ was identified. This plays key role in discussion ground-state triaxiality $^{86}\mathrm{Ge}$, along with other...
Neutron-rich Se88,90,92,94 isotopes were studied via in-beam γ-ray spectroscopy after nucleon removal reactions at intermediate energies the Radioactive Isotope Beam Factory. Based on γ−γ coincidence analysis, low-lying excitation level schemes are proposed for these nuclei, including 21+, 41+ states and 22+ remarkably low energies. The states, along with other features, indicate triaxiality in nuclei. experimental results good overall agreement self-consistent beyond-mean-field calculations...
We report on the measurement of new low-lying states in neutron-rich 81,82,83,84Zn nuclei via in-beam γ-ray spectroscopy. These include 41+→21+ transition 82Zn, 21+→0g.s.+ and transitions 84Zn, 81,83Zn were observed for first time. The reduced E(21+) energies increased E(41+)/E(2+1) ratios at N=52, 54 compared to those 80Zn attest that magicity is confined neutron number N=50 only. deduced level schemes are three state-of-the-art shell model calculations a good agreement with all...
Lifetime measurements of excited states the light N=52 isotones ^{88}Kr, ^{86}Se, and ^{84}Ge have been performed, using recoil distance Doppler shift method VAMOS AGATA spectrometers for particle identification gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B(E2;2^{+}→0^{+}) B(E2;4^{+}→2^{+}) were obtained first time hard-to-reach ^{84}Ge. While values ^{86}Se saturate maximum collectivity offered by natural valence (3s, 2d, 1g_{7/2}, 1h_{11/2})...
Proton inelastic scattering of $^{72,74}\mathrm{Ni}$ and $^{76,80}\mathrm{Zn}$ ions at energies around 235 MeV/nucleon was performed the Radioactive Isotope Beam Factory studied using $\ensuremath{\gamma}$-ray spectroscopy. Angular integrated cross sections for direct to ${2}_{1}^{+}$ ${4}_{1}^{+}$ states were measured. The Jeukenne-Lejeune-Mahaux folding model, extended beyond 200 MeV, used together with neutron proton densities stemming from quasiparticle random-phase approximation (QRPA)...
The N=52 Ga83 β decay was studied at ALTO. radioactive 83Ga beam produced through the ISOL photofission technique and collected on a movable tape for measurement of γ-ray emission following decay. While β-delayed neutron has been measured to be 56–85% path, in this experiment an unexpected high-energy 5–9 MeV yield 16(4)% observed, coming from states several MeVs above separation threshold. This result is compared with cutting-edge QRPA calculations, which show that when neutrons deeply...
Sodium-cerium molybdate, NaCe(MoO4)2, belongs to the family of double alkaline rare-earth and it holds significant importance across various technological domains, such as environmental remediation energy conversion. Despite its importance, behavior NaCe(MoO4)2 under high-pressure conditions remains unexplored. This study uses synchrotron x-ray diffraction Raman spectroscopy investigate NaCe(MoO4)2in situ conditions. We observed a pressure-induced phase transition from scheelite...
Cross sections and corresponding momentum distributions have been measured for the first time at zero degrees exotic nuclei obtained from a beam of 18O 8.5 MeV/A impinging on 1 mg/cm2 238U target. Sizable cross were found production species arising neutron transfer proton removal projectile. Comparisons experimental results with calculations based deep-inelastic reaction models, taking into account particle evaporation process, indicate that degree is scattering angle which differential...
The structures of the neutron-rich $^{69,71,73}\mathrm{Co}$ isotopes were investigated via $(p,2p)$ knockout reactions at Radioactive Isotope Beam Factory, RIKEN. Isotopes interest studied using DALI2 $\ensuremath{\gamma}$-ray detector array combined with MINOS target and tracker system. Level schemes reconstructed $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidence technique, tentative spin-parity assignments based on measured inclusive exclusive cross sections....
The nuclear structure of the $^{76}\mathrm{Ni}$ nucleus was investigated by ($p,2p$) reaction using a NaI(Tl) array to detect deexciting prompt $\ensuremath{\gamma}$ rays. A new transition with an energy 2227 keV identified $\ensuremath{\gamma}\ensuremath{\gamma}$ and $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\gamma}$ coincidences. According these coincidence spectra observed connects state at 4147 previously known ${4}_{1}^{+}$ 1920 keV. Two weaker transitions were also obtained...
Here we present new information on the shape evolution of very neutron-rich ^{92,94}Se nuclei from an isomer-decay spectroscopy experiment at Radioactive Isotope Beam Factory RIKEN. High-resolution germanium detectors were used to identify delayed γ rays emitted following decay their isomers. New transitions are reported extending previously known level schemes. The isomeric levels interpreted as originating high-K quasineutron states with oblate deformation β∼0.25, state in ^{94}Se being...
Twenty-one two-proton knockout (p,3p) cross sections were measured from neutron-rich nuclei at ∼250 MeV/nucleon in inverse kinematics. The angular distribution of the three emitted protons was determined for first time, demonstrating that kinematics are consistent with two sequential proton-proton collisions within projectile nucleus. Ratios over (p,2p) inclusive follow trend other many-nucleon removal reactions, further reinforcing nature nuclei.
We report on $\ensuremath{\gamma}$-ray spectroscopy of low-lying excited states in the neutron-rich $^{94,95,96}\mathrm{Kr}$ isotopes measured as part ``Shell Evolution And Search for Two-plus energies At RIBF'' (SEASTAR) campaign at RIKEN Radioactive Isotope Beam Factory. Excited yrast and non-yrast were observed, half-lives extracted via geant4 simulations. In $^{94,96}\mathrm{Kr}$ candidates ${3}_{1}^{\ensuremath{-}}$ state identified. For $^{95}\mathrm{Kr}$, prompt SEASTAR data combined...
Excited states in 63,65,67Mn were studied via in-beam γ-ray spectroscopy following knockout reactions from 68Fe. Similar level schemes, consisting of the 11/2−, 9/2−, 7/2− and 5/2g.s.− sequence, connected by I→I−1 transitions, established, first time for 65,67Mn. Their structures show features consistent with strongly-coupled rotational bands K=5/2. State-of-the-art shell-model calculations modified LNPS effective interaction reproduce observed levels remarkably well suggest dominance...