F. Negoiţă
A5077317908- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Laser-Plasma Interactions and Diagnostics
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Nuclear reactor physics and engineering
- High-pressure geophysics and materials
- Laser-induced spectroscopy and plasma
- Particle accelerators and beam dynamics
- Laser Design and Applications
- Advanced NMR Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Subatomic Physics Research
- Rare-earth and actinide compounds
- Radiation Therapy and Dosimetry
- Particle physics theoretical and experimental studies
- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Radiation Detection and Scintillator Technologies
- Laser-Matter Interactions and Applications
- Neutrino Physics Research
- Radiopharmaceutical Chemistry and Applications
- Semiconductor materials and devices
Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering
2014-2025
Extreme Light Infrastructure - Nuclear Physics
2014-2025
Institutul de Fizică Atomică
2001-2024
University of Surrey
2018
Centre National de la Recherche Scientifique
1997-2016
Campus France
2007-2016
Université Paris-Sud
2007-2016
GANIL
1997-2015
Czech Academy of Sciences, Institute of Physics
2004-2015
Institut National de Physique Nucléaire et de Physique des Particules
1997-2014
The European Strategy Forum on Research Infrastructures (ESFRI) has selected in 2006 a proposal based ultra-intense laser fields with intensities reaching up to 1022-1023 W cm-2 called 'ELI' for Extreme Light Infrastructure. construction of large-scale laser-centred, distributed pan-European research infrastructure, involving beyond the state-of-the-art ultra-short and technologies, received approval funding 2011-2012. three pillars ELI facility are being built Czech Republic, Hungary...
The energies of the excited states in very neutron-rich (42)Si and (41,43)P have been measured using in-beam gamma-ray spectroscopy from fragmentation secondary beams (42,44)S at 39A MeV. low 2(+) energy (42)Si, 770(19) keV, together with level schemes (41,43)P, provides evidence for disappearance Z=14 N=28 spherical shell closures, which is ascribed mainly to action proton-neutron tensor forces. New model calculations indicate that best described as a well-deformed oblate rotor.
In-beam γ-ray spectroscopy using fragmentation reactions of both stable and radioactive beams has been performed in order to study the structure excited states neutron-rich oxygen isotopes with masses ranging from A=20 24. For produced fragments, energies, intensities, γ−γ coincidences have measured. Based on this information new level schemes are proposed for O21,22 up neutron separation energy. The nonobservation any γ-decay branch O23 O24 suggests that their lie above decay thresholds....
A new isomeric 0(+) state was identified as the first excited in self-conjugate (N=Z) nucleus 72Kr. By combining for time conversion-electron and gamma-ray spectroscopy with production of metastable states high-energy fragmentation, electric-monopole decay isomer to ground established. The is understood band head known prolate rotational structure, which strongly supports interpretation that 72Kr one rare nuclei having an oblate-deformed state. This observation gives fact evidence a shape...
The structure of $^{44}$S has been studied using delayed $\gamma$ and electron spectroscopy at \textsc{ganil}. decay rates the 0$^+_2$ isomeric state to 2$^+_1$ 0$^+_1$ states have measured for first time, leading a reduced transition probability B(E2~:~2$^{+}_1$$\rightarrow$0$^{+}_2)$= 8.4(26)~e$^2$fm$^4$ monopole strength $\rho^2$(E0~:~0$^{+}_2$$\rightarrow$0$^{+}_1)$ =~8.7(7)$\times$10$^{-3}$. Comparisons shell model calculations point towards prolate-spherical shape coexistence...
We present the results of first commissioning phase short-focal-length area Apollon laser facility (located in Saclay, France), which was performed with available beam (F2), scaled to a nominal power 1 PW. Under conditions that were tested, this delivered on-target pulses 10 J average energy and 24 fs duration. Several diagnostics fielded assess performance facility. The focal spot its spatial stability, temporal intensity profile prior main pulse, resulting density gradient formed at...
High power lasers have proven being capable to produce high energy gamma rays, charged particles and neutrons induce all kinds of nuclear reactions. At ELI, the studies with will enter for first time into new domains intensities.
Measurements of the beta-decay half-lives neutron-rich nuclei (MgAr) in vicinity N=28 shell closure are reported. Some 22 have been determined, 12 which for first time. Particular emphasis is placed on results Si isotopes, extended from N=25 to 28. Comparison with QRPA calculations suggests that 42Si strongly deformed. This discussed light a possible weakening spin–orbit potential.
The structure of 617−20C nuclei was investigated by means the in-beam γ-ray spectroscopy technique using fragmentation reactions radioactive beams. Based on particle-γ and particle-γγ coincidence data, level schemes are constructed for neutron-rich C17−20 nuclei. systematics first excited 2+ states in carbon isotopes is extended time to A=20 showing that contrast case oxygen isotopes, N=14 subshell closure disappears. Experimental results compared with shell-model calculations. Agreement...
The 02(+) state in 34Si has been populated at the GANIL-LISE3 facility through β decay of a newly discovered 1(+) isomer 34Al 26(1) ms half-life. simultaneous detection e(+)e(-) pairs allowed determination excitation energy E(02(+))=2719(3) keV and half-life T(1/2)=19.4(7) ns, from which an electric monopole strength ρ(2)(E0)=13.0(0.9)×10(-3) was deduced. 2(1)(+) is observed to both 0(1)(+) ground 0(2)(+) [via 607(2) transition] with ratio R(2(1)(+)→0(1)(+)/2(1)(+)→0(2)(+))=1380(717)....
High-power laser systems have opened new frontiers in scientific research and revolutionized various fields, offering unprecedented capabilities for understanding fundamental physics allowing unique applications. This paper details the successful commissioning of 1 PW experimental area at Extreme Light Infrastructure–Nuclear Physics (ELI-NP) facility Romania, using both available arms. The setup featured a short focal parabolic mirror to accelerate protons through target normal sheath...
The reaction cross section for $^{8}\mathrm{B}$ and $^{7}\mathrm{Be}$ the breakup on silicon have been measured incident energies between 10 40 MeV/nucleon with a stack of detectors. Secondary beams were obtained by use LISE spectrometer at GANIL. detectors had multiple purpose slowing down secondary beams, identifying products, measuring their energy. separate contributions diffraction dissociation absorption to determined. parallel momentum distribution resulting from has also data are...
A decay spectroscopic study of the neutron-rich isotopes has been performed using fragmentation a $^{86}\mathrm{Kr}$ primary beam. Fragments from this reaction have selected by LISE2000 spectrometer at Grand Acc\'el\'erateur National d'Ions Lourds (GANIL). Half-lives 29 isotopes, including first ones identified for $^{61}\mathrm{Ti}$ ($15\ifmmode\pm\else\textpm\fi{}4$ ms), $^{64}\mathrm{V}$ ($19\ifmmode\pm\else\textpm\fi{}8$ and $^{71}\mathrm{Fe}$ ($28\ifmmode\pm\else\textpm\fi{}5$...
With the much-anticipated multi-petawatt (PW) laser facilities that are coming online, neutron sources with extreme fluxes could soon be in reach. Such would rely on spallation by protons accelerated high-intensity lasers. These high make possible not only direct measurements of capture and β-decay rates related to r-process nucleosynthesis heavy elements, but also such nuclear a hot plasma environment, which beneficial for s-process investigations astrophysically relevant conditions. This...
Radioactive beams of $^{14}$O and $^{15}$O were used to populate the resonant states 1/2$^+$, 5/2$^+$ $0^-,1^-,2^-$ in unbound $^{15}$F $^{16}$F nuclei respectively by means proton elastic scattering reactions inverse kinematics. Based on their large spectroscopic factor values, can be viewed as a core plus 2s$_{1/2}$ or 1d$_{5/2}$ shell neutron 1p$_{1/2}$. Experimental energies derive strength 2s$_{1/2}$-1p$_{1/2}$ 1d$_{5/2}$-1p$_{1/2}$ proton-neutron interactions. It is found that former...
The development of high power lasers and the combination such novel devices with accelerator technology has enlarged science reach many research fields, in particular particle nuclear physics, astrophysics as well societal applications material science, energy for medicine. European Strategic Forum Research Infrastructures selected a proposal based on these new premises called Extreme Light Infrastructure (ELI). ELI will be built network three complementary pillars at frontier laser...
The production of neutron beams having short temporal duration is studied using ultraintense laser pulses. Laser-accelerated protons are spectrally filtered a laser-triggered microlens to produce pulse via nuclear reactions induced in converter material (LiF). This produces $\ensuremath{\sim}3\text{ }\text{ }\mathrm{ns}$ with ${10}^{4}\text{ }\mathrm{n}/\mathrm{MeV}/\mathrm{sr}/\mathrm{shot}$ at 0.56 m from the laser-irradiated proton source. large spatial separation between and source...
Intense and purified radioactive beam of post-accelerated 14O was used to study the low-lying states in unbound 15F nucleus. Exploiting resonant elastic scattering inverse kinematics with a thick target, second excited state, resonance at ER=4.757(6)(10)MeV width Γ=36(5)(14)keV measured for first time high precision. The structure this narrow above-barrier state nucleus located two neutrons beyond proton drip line investigated using Gamow Shell Model coupled channel representation 12C core...
The yrast ${J}^{\ensuremath{\pi}}={8}^{+}$ states in neutron-rich $^{70,72,74,76}\mathrm{Ni}$ nuclei are predicted to be isomeric. present paper describes two GANIL experiments. In the first of them a search was made for ${8}^{+}$ isomeric $^{72,74}\mathrm{Ni}$ via fragmentation $^{76}\mathrm{Ge}$ using ion $\ensuremath{\gamma}$-decay correlation technique. Although these were not observed, limits their lifetimes determined. second experiment decay spectroscopy $^{70,72}\mathrm{Co}$...