C. Delafosse
A5084781803- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Nuclear reactor physics and engineering
- Neutrino Physics Research
- Advanced Chemical Physics Studies
- Radiation Detection and Scintillator Technologies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Astro and Planetary Science
- Particle accelerators and beam dynamics
- Astrophysical Phenomena and Observations
- Advanced NMR Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Mass Spectrometry Techniques and Applications
- Particle physics theoretical and experimental studies
- Radioactivity and Radon Measurements
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Enzyme Structure and Function
- Geomagnetism and Paleomagnetism Studies
- DNA and Nucleic Acid Chemistry
University of Jyväskylä
2019-2025
Université Paris-Saclay
2016-2025
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2020-2025
Institut de Physique
2015-2024
Institut National de Physique Nucléaire et de Physique des Particules
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Laboratoire de Physique des deux infinis Bordeaux
2024
Université Paris-Sud
2015-2019
Université Paris Cité
2018-2019
École Centrale Paris
2000
Precision mass measurements of neutron-rich rhodium isotopes have been performed at the JYFLTRAP Penning trap spectrometer Ion Guide Isotope Separator On-Line (IGISOL) facility. We report results on ground- and isomeric-state masses in $^{110,112,114,116,118}\mathrm{Rh}$ very first measurement $^{120}\mathrm{Rh}$. The isomeric states were separated measured for time using phase-imaging ion-cyclotron-resonance (PI-ICR) technique. For $^{112}\mathrm{Rh}$, we also new half-lives both ground...
The N=48 Ge80 nucleus is studied by means of β-delayed electron-conversion spectroscopy at ALTO. radioactive Ga80 beam produced through the isotope separation on line photofission technique and collected a movable tape for measurement γ e− emission following β decay. An electric monopole E0 transition, which points to 639(1) keV intruder 02+ state, observed first time. This new state lower than 21+ level in Ge80, provides evidence shape coexistence close one most neutron-rich doubly magic...
High-precision mass measurements of exotic ^{95-97}Ag isotopes close to the N=Z line have been conducted with JYFLTRAP double Penning trap spectrometer, silver ions produced using recently commissioned inductively heated hot cavity catcher laser ion source at Ion Guide Isotope Separator On-Line facility. The atomic ^{95}Ag was directly determined for first time. In addition, masses β-decaying 2^{+} and 8^{+} states in ^{96}Ag identified measured time, precision ^{97}Ag has improved. newly...
Abstract Understanding the evolution of nuclear charge radius is one long-standing challenges for theory. Recently, density functional theory calculations utilizing Fayans functionals have successfully reproduced radii a variety exotic isotopes. However, difficulties in isotope production hindered testing these models immediate region chart below heaviest self-conjugate doubly-magic nucleus 100 Sn, where near-equal number protons ( Z ) and neutrons N lead to enhanced neutron-proton pairing....
The multinucleon transfer (MNT) reaction approach was successfully employed for the first time to measure isomeric ratios (IRs) of 211Po isomer (25/2+) and its ground state (9/2+) at IGISOL facility using a 945 MeV 136Xe beam impinged on 209Bi natPb targets. dominant production isomers compared corresponding states consistently revealed in α-decay spectra. Deduced IR populated through 136Xe+natPb found have an enhancement ≈1.8-times than that observed 136Xe+209Bi. State-of-the-art...
We report on the masses and hyperfine structure of ground isomeric states in 114,116,118,120Ag isotopes, measured with phase-imaging ion-cyclotron-resonance technique (PI-ICR) JYFLTRAP mass spectrometer collinear laser spectroscopy beamline at Ion Guide Isotope Separator On-Line facility, Jyväskylä, Finland. excitation energies, electromagnetic moments, charge radii, firmly established nuclear spins long-lived states. A new isomer was discovered 118Ag half-lives were reevaluated....
The <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>β</a:mi></a:math>-delayed neutron emission in the <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:mmultiscripts><b:mi>As</b:mi><b:mprescripts/><b:none/><b:mrow><b:mn>85</b:mn><b:mo>,</b:mo><b:mn>86</b:mn></b:mrow></b:mmultiscripts><b:mspace width="4pt"/><b:mi>β</b:mi></b:mrow></b:math> decays has been measured at Ion Guide Isotope Separator On Line facility of Accelerator Laboratory University Jyväskylä. complete...
Prompt γ-ray spectroscopy of the neutron-rich ^{96}Kr, produced in transfer- and fusion-induced fission reactions, has been performed using combination Advanced Gamma Tracking Array VAMOS++ spectrometer. A second excited state, assigned to J^{π}=4^{+}, is observed for first time, a previously reported level energy 2^{+} state confirmed. The measured ratio R_{4/2}=E(4^{+})/E(2^{+})=2.12(1) indicates that this nucleus does not show well-developed collectivity contrary seen heavier N=60...
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})...
The ground-state-to-ground-state β−-decay 131I (7/2+) → 131Xe (3/2+) Q value was determined with high precision utilizing the double Penning trap mass spectrometer JYFLTRAP at IGISOL facility. of this found to be = 972.25(19) keV through a cyclotron frequency ratio measurement relative 1.6 × 10−9. This realized using phase-imaging ion-cyclotron-resonance technique. new is more than 3 times precise and 2.3σ higher (1.45 keV) extracted from Atomic Mass Evaluation 2020. Our confirms that 9/2+...
We report on a set of high-precision measurements nuclear binding and excitation energies, as well spins, magnetic dipole electric quadrupole moments neutron-rich silver isotopes, 113−123Ag. The were performed using the JYFLTRAP mass spectrometer collinear laser spectroscopy beamline at Ion Guide Isotope Separator On-Line (IGISOL) facility. For first time, we can firmly establish ordering long-lived Iπ=1/2−,7/2+ states in these pin down inversion two levels either A=121(N=74) or A=123(N=76)....
We report on precision mass measurements of $^{113,115,117}\mathrm{Ru}$ performed with the JYFLTRAP double Penning trap spectrometer at Accelerator Laboratory University Jyv\"askyl\"a. The phase-imaging ion-cyclotron-resonance technique was used to resolve ground and isomeric states in $^{113,115}\mathrm{Ru}$ enabled for first time a measurement isomer excitation energies, ${E}_{x}(^{113}\mathrm{Ru}^{\mathrm{m}})=100.5(8)$ keV ${E}_{x}(^{115}\mathrm{Ru}^{\mathrm{m}})=129(5)$ keV. state...
The $\ensuremath{\beta}$ decay of $^{82}\mathrm{Ge}$ was re-investigated using the newly commissioned tape station BEDO at electron-driven ISOL (isotope separation on line) facility ALTO operated by Institut de Physique Nucl\'eaire, Orsay. original motivation this work focused sudden occurrence in light $N=49$ odd-odd isotonic chain a large number $J\ensuremath{\le}1$ states (positive or negative parity) $^{80}\mathrm{Ga}$ providing reliable intermediate example, viz., $^{82}\mathrm{As}$....
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...
The masses of $^{84}$Br, $^{105}$Mo, $^{115,119,121}$Pd, $^{122}$Ag, $^{127,129}$In, $^{132}$Sb and their respective isomeric states have been measured with the JYFLTRAP Penning trap mass spectrometer using phase-imaging ion-cyclotron-resonance technique. excitation energies in $^{119}$Pd were experimentally determined for first time, while $^{115}$Pd precision values was substantially improved. In $^{105}$Mo $^{121}$Pd there no signs a long-lived state. ground-state measurements $^{122}$Ag...
We report on spectroscopic information and lifetime measurements of even-even neutron-rich Te isotopes. Excited states were populated in fast-neutron induced fission $^{238}\mathrm{U}$ at the ALTO facility IJCLab with LICORNE neutron source detected using hybrid $\ensuremath{\nu}$-ball spectrometer. provide first results lifetimes ${6}_{1}^{+}$ state $^{136}\mathrm{Te}$ (${6}_{1}^{+}$), (${4}_{1}^{+}$), (${2}_{1}^{+}$) $^{138}\mathrm{Te}$ discuss context large-scale shell-model calculations....
The first direct determination of the ground-state--to--ground-state $Q$ values ${\ensuremath{\beta}}^{\ensuremath{-}}$ decay $^{76}\mathrm{As}\phantom{\rule{4pt}{0ex}}\ensuremath{\rightarrow}\phantom{\rule{4pt}{0ex}}^{76}\mathrm{Se}$ and electron-capture $^{155}\mathrm{Tb}\phantom{\rule{4pt}{0ex}}\ensuremath{\rightarrow}\phantom{\rule{4pt}{0ex}}^{155}\mathrm{Gd}$ was performed utilizing double Penning trap mass spectrometer JYFLTRAP. By measuring atomic difference pairs via phase-imaging...
The population of isomeric states in the prompt decay fission fragments---so-called yield ratios (IYRs)---is known to be sensitive angular momentum $J$ that fragment emerged with, and may therefore contain valuable information on mechanism behind process. In this work, we investigate how changes fissioning system impact measured IYRs fragments learn more about what parameters affect generation. To enable this, a new technique for measuring is first demonstrated. It based time arrival...
On
The high-spin states of the neutron-rich $^{81}\mathrm{Ga}$, with three valence protons outside a $^{78}\mathrm{Ni}$ core, were measured. measurement involved prompt $\ensuremath{\gamma}$-ray spectroscopy fission fragments isotopically identified using combination variable mode spectrometer ($\mathrm{VAMOS}++$) and advanced gamma tracking array (AGATA). new transitions, observed in coincidence $^{81}\mathrm{Ga}$ ions, corresponding level scheme do not confirm levels reported earlier. newly...
The structure of $^{83}\mathrm{As}$, $^{85}\mathrm{As}$, and $^{87}\mathrm{As}$ have been studied in fusion-fission reaction $^{238}\mathrm{U}+^{9}\mathrm{Be}$. Fission fragments were identified mass atomic number using the VAMOS$++$ spectrometer coincident $\ensuremath{\gamma}$ rays detected $\ensuremath{\gamma}$-ray tracking array AGATA. New transitions $^{83}\mathrm{As}$ $^{85}\mathrm{As}$ are reported placed level schemes. A scheme excited states is proposed for first time. data...