M. Vandebrouck
A5029370742- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Advanced NMR Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Chemical Physics Studies
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Astro and Planetary Science
- Mass Spectrometry Techniques and Applications
- Nuclear reactor physics and engineering
- Solid-state spectroscopy and crystallography
- Boron Compounds in Chemistry
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Rare-earth and actinide compounds
- Radiation Therapy and Dosimetry
- Optical Imaging and Spectroscopy Techniques
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Thermodynamic and Structural Properties of Metals and Alloys
- Advanced Materials Characterization Techniques
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
Université Paris-Saclay
2015-2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2019-2024
CEA Paris-Saclay
2017-2024
Centre National de la Recherche Scientifique
2013-2023
Institut National de Physique Nucléaire et de Physique des Particules
2013-2023
GANIL
2015-2023
Universidade de Santiago de Compostela
2020-2023
Laboratoire National Henri Becquerel
2018-2023
Laboratoire d’Imagerie Biomédicale
2023
The unbound nucleus O26 has been investigated using invariant-mass spectroscopy following one-proton removal reaction from a F27 beam at 201 MeV/nucleon. decay products, O24 and two neutrons, were detected in coincidence the newly commissioned SAMURAI spectrometer RIKEN Radioactive Isotope Beam Factory. ground-state resonance was found to lie only 18±3(stat)±4(syst) keV above threshold. In addition, higher lying level, which is most likely first 2+ state, observed for time 1.28−0.08+0.11 MeV...
The interaction cross sections (σI) of the very neutron-rich carbon isotopes 19C, 20C and 22C have been measured on a target at 307, 280, 235 MeV/nucleon, respectively. A σI 1.280±0.023 b was obtained for 22C, significantly larger than 19,20C, supporting halo character 22C. root-mean-squared matter radius 3.44±0.08 fm deduced using four-body Glauber reaction model. This value is smaller an earlier estimate (of 5.4±0.9 fm) derived from measurement hydrogen 40 MeV/nucleon. These new,...
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...
The heaviest bound isotope of boron ^{19}B has been investigated using exclusive measurements its Coulomb dissociation, into ^{17}B and two neutrons, in collisions with Pb at 220 MeV/nucleon. Enhanced electric dipole (E1) strength is observed just above the two-neutron decay threshold an integrated E1 B(E1)=1.64±0.06(stat)±0.12(sys) e^{2} fm^{2} for relative energies below 6 MeV. This feature, known as a soft excitation, provides first firm evidence that prominent halo. Three-body...
The isoscalar monopole response has been measured in the unstable nucleus (68)Ni using inelastic alpha scattering at 50A MeV inverse kinematics with active target MAYA GANIL. giant resonance (ISGMR) centroid was determined to be 21.1 ± 1.9 and indications for a soft mode are provided first time 12.9 1.0 MeV. Analysis of corresponding angular distributions distorted-wave-born approximation random-phase transition densities indicates that L = 0 multipolarity dominates cross section ISGMR...
The observed primordial 7Li abundance in metal-poor halo stars is found to be lower than its Big-Bang nucleosynthesis (BBN) calculated value by a factor of approximately three. Some recent works suggested the possibility that this discrepancy originates from missing resonant reactions which would destroy 7Be, parent 7Li. most promising candidate resonances were include possibly missed 1- or 2- narrow state around 15 MeV compound nucleus 10C formed 7Be+3He and close 7.8 11C 7Be+4He. In work,...
The most neutron-rich boron isotopes $^{20}\mathrm{B}$ and $^{21}\mathrm{B}$ have been observed for the first time following proton removal from $^{22}\mathrm{N}$ $^{22}\mathrm{C}$ at energies around $230\text{ }\text{ }\mathrm{MeV}/\mathrm{nucleon}$. Both nuclei were found to exist as resonances which detected through their decay into $^{19}\mathrm{B}$ one or two neutrons. Two-proton populated a prominent resonancelike structure in 2.5 MeV above one-neutron threshold, is interpreted arising...
A novel system has been developed to detect simultaneous double-alpha emission from purified and weightless sources. The includes the collection of 224Ra low-energy recoils in helium buffer gas decay 228Th. recoil products are thermalized collected a cryogenic cell extracted into an RF-ion guide for mass selection. mass-separated ions implanted at low kinetic energy thin carbon foil placed between two large-area double-sided silicon strip detectors observe correlated alpha-particle emission....
Isoscalar giant resonances have been measured in the unstable Ni68 nucleus using inelastic alpha and deuteron scattering at 50A MeV inverse kinematics with active target MAYA GANIL. Using scattering, extracted isoscalar monopole resonance (ISGMR) centroid was determined to be 21.1±1.9 quadrupole (ISGQR) 15.9±1.3 MeV. Indications for soft dipole modes are provided. Results obtained both (α,α′) (d,d′) probes compatible. The evolution of along Ni isotopic chain from Ni56 is discussed.6...
The quasi-free scattering reactions 11C(p,2p) and 10,11,12C(p,pn) have been studied in inverse kinematics at beam energies of 300–400 MeV/u the R3B-LAND setup. outgoing proton-proton proton-neutron pairs were detected coincidence with reaction fragments kinematically complete measurements. efficiency to detect these has obtained from GEANT4 simulations which tested using 12C(p,2p) 12C(p,pn) reactions. Experimental cross sections momentum distributions compared DWIA calculations based on...
Decay spectroscopy of ${}^{250}$No, aided by digital pulse-shape analysis, is reported and identifies this nucleus to be one the rare breed very heavy nuclei with an isomeric state living considerably longer than its ground state. This phenomenon has interesting consequences for nuclear structure models aiming determine borders island stability superheavy elements.
The Isoscalar Giant Monopole Resonance (ISGMR) and the Dipole (ISGDR) compression modes have been studied in doubly-magic unstable nucleus 56Ni. They were measured by inelastic α-particle scattering inverse kinematics at 50 MeV/u with MAYA active target GANIL facility. centroid of ISGMR has obtained Ex=19.1±0.5MeV. Evidence for low-lying part ISGDR found Ex=17.4±0.7MeV. strength distribution dipole mode shows similarity prediction from Hartree–Fock (HF) based random-phase approximation (RPA)...
The low-lying unbound level structure of the halo nucleus 19C has been investigated using single-neutron knockout from 20C on a carbon target at 280 MeV/nucleon. invariant mass spectrum, derived momenta forward going beam velocity 18C fragment and neutrons, was found to be dominated by very narrow near threshold (Erel=0.036(1) MeV) peak. Two less strongly populated resonance-like features were also observed Erel=0.84(4) 2.31(3) MeV, both which exhibit characteristics consistent with neutron...
The inelastic ?-scattering experiment on 56Ni in inverse kinematics was performed at an incident energy of 50 MeV/u GANIL. A very high multiplicity for ?-particle emission observed with our phase-space limited experimental set-up. maximum multiplicity, which cannot be explained by means the statistical decay model, amounted to seven. ideal classical gas model kT = 3 MeV fairly well reproduced momentum distribution and alpha particles. This result strongly suggests that alpha-gas state may...
Background: For many years, quasifree scattering reactions in direct kinematics have been extensively used to study the structure of stable nuclei, demonstrating potential this approach. The RB3 collaboration has performed a pilot experiment inverse for C12 beam. results from that constitute first and complete kinematics. This technique lately extended exotic beams investigate evolution shell structure, which attracted much interest due changes if number protons or neutrons is varied....
The structure of $^{35}\mathrm{P}$ was studied with a one-proton knockout reaction at 88 MeV/u from $^{36}\mathrm{S}$ projectile beam NSCL. $\ensuremath{\gamma}$ rays the depopulation excited states in were detected GRETINA, while nuclei identified event-by-event focal plane S800 spectrograph. level scheme deduced up to 7.5 MeV using $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidences. observed levels attributed proton removals $sd$ shell and also deeply bound...
Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function binding energy, ultimately when nuclei become unbound, is poorly known. The $^{26}\mathrm{F}$ nucleus, composed deeply bound $\ensuremath{\pi}0{d}_{5/2}$ proton and an unbound $\ensuremath{\nu}0{d}_{3/2}$ neutron on top $^{24}\mathrm{O}$ core, particularly adapted for this purpose. coupling results in...
The ${}^{26}\mathrm{Al}$ radioisotope is of great importance for understanding the chemical and dynamical evolution our galaxy. Among possible stellar sources, massive stars are believed to be main producer this radioisotope. Understanding nucleosynthesis in requires estimates thermonuclear reaction rates $^{26}\mathrm{Al}$${(n,p)}^{26}$Mg, $^{26}\mathrm{Al}$${(n,\ensuremath{\alpha})}^{23}$Na, $^{23}\mathrm{Na}$${(\ensuremath{\alpha},p)}^{26}$Mg reactions. These depend on spectroscopic...
The first investigation of the single-particle structure bound states 17C, via d(16C, p) transfer reaction, has been undertaken. measured angular distributions confirm spin-parity assignments 1/2+ and 5/2+ for excited located at 217 335 keV, respectively. spectroscopic factors deduced these exhibit a marked character, in agreement with shell model particle-core calculations, combined their near degeneracy energy provide clear evidence absence N = 14 sub-shell closure. very small factor found...
The quantum-mechanical nuclear-shell structure determines the stability and limits of existence heaviest nuclides with large proton numbers Z ≳ 100 (refs.
Volumetric, multimodal imaging with precise spatial and temporal coregistration can provide valuable complementary information for diagnosis monitoring. Considerable research has sought to combine 3-D photoacoustic (PA) ultrasound (US) in clinically translatable configurations; however, technical compromises currently result poor image quality either PA or ultrasonic modes. This work aims translatable, high-quality, simultaneously coregistered dual-mode PA/US tomography. Volumetric based on...
The isovector and isoscalar components of neutron-proton pairing are investigated in the N=Z unstable nuclei \textit{fp}-shell through two-nucleon transfer reaction (p,$^3$He) inverse kinematics. combination particle gamma-ray detection with radioactive beams $^{56}$Ni $^{52}$Fe, produced by fragmentation at GANIL/LISE facility, made it possible to carry out this study for first time a closed an open-shell nucleus \textit{fp}-shell. cross-sections ground-state (J=0$^+$,T=1) (J=1$^+$,T=0)...