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Actualités et Faits Marquants

Precision Measurement of the First Ionization Potential of Nobelium

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One of the most important atomic properties governing an element’s chemical behavior is the energy required to remove its least-bound electron, referred to as the first ionization potential. For the heaviest elements, this fundamental quantity is strongly influenced by relativistic effects which (...)

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Probing Sizes and Shapes of Nobelium Isotopes by Laser Spectroscopy

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Physical and chemical properties of the transfermium elements (Z > 100) are influenced by relativistic effects altering the configuration of the electron shell. Laser spectroscopy allows probing precisely atomic properties and thus gives access to a better understanding of relativistic (...)

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A new leading contribution to neutrinoless double-beta decay

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V. Cirigliano, W. Dekens, J. de Vries, M.L. Graesser, E. Mereghetti, S. Pastore, and U. van Kolck, Phys. Rev. Lett. 120 (2018) 202001 One of the most important advancements in modern particle physics was the observation of neutrino oscillations and the inference that neutrinos have mass. (...)

V. Cirigliano, W. Dekens, J. de Vries, M.L. Graesser, E. Mereghetti, S. Pastore, and U. van Kolck, Phys. Rev. Lett. 120 (2018) 202001

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Mesures de masse : l’IPN participe à des expériences originales menées à RIKEN-RIBF

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Mass Measurements IPN collaborates on first direct mass measurements around Z=100 with a Multireflection Time of Flight Mass Spectrograph (MRTOF-MS) at RIKEN-RIBF One of the most important features of superheavy nuceli (SHE) is the appearance of an "island of stability" where shape and shell (...)

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L’IPN a livré les klystrons du projet FAIR à GSI

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Dans le cadre du projet FAIR, un linac proton (pLinac) est prévu pour accélérer les protons jusqu’à 70 MeV. La durée du pulse faisceau est de 70 µs et le courant pendant l’impulsion est de 70 mA.. Le linac se composera d’un RFQ et de 6 cavités Crossed-bar-H (CH) accélérant le faisceau jusqu’à son énergie (...)

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First Exclusive Measurement of Deeply Virtual Compton Scattering off 4He : Toward the 3D Tomography of Nuclei

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M. Hattawy et al. (CLAS Collaboration), Phys. Rev. Lett. 119, 202004 (2017) A wealth of information on the structure of matter lies in the correlations between the momentum and spatial distributions of the fundamental constituents of matter : quarks and gluons. These correlations are (...)

Phys. Rev. Lett. 119, 202004 (2017)

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Publications récentes

Electric dipole strength and dipole polarizability in 48Ca within a fully self-consistent second random–phase approximation

The second random–phase–approximation model corrected by a subtraction procedure designed to cure double counting, instabilities, and ultraviolet divergences, is employed for the first time to analyze the dipole strength and polarizability in 48Ca. All the terms of the residual interaction (...)

D. Gambacurta, M. Grasso, O. Vasseur

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Single-particle strength from nucleon transfer in oxygen > isotopes : Sensitivity to model parameters

In the analysis of transfer reaction data to extract nuclear structure information the choice of input parameters to the reaction model such as distorting potentials and overlap functions has a significant impact. In this paper we consider a set of data for the (d,t) and (d,3He) reactions on (...)

F. Flavigny, N. Keeley, A. Gillibert, and A. Obertelli

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Violent fluctuations in fluids of neutrons and protons explain how atomic nuclei disintegrate

Perturbing fluids of neutrons and protons (nuclear matter) may lead, as the most catastrophic effect, to the rearrangement of the fluid into clusters of nucleons. A similar process may occur in a single atomic nucleus undergoing a violent perturbation, like in heavy-ion collisions tracked (...)

P. Napolitani and M. Colonna

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Unexpected high-energy γ emission from decaying exotic nuclei

The N = 52 83Ga β decay was studied at ALTO. The radioactive 83Ga beam was produced through the ISOL photofission technique and collected on a movable tape for the measurement of γ -ray emission following β decay. While β-delayed neutron emission (...)

A. Gottardo, D. Verney, I. Deloncle, S. Péru, C. Delafosse, S. Roccia, I. Matea, C. Sotty, C. Andreoiu, C. Costache, M.-C. Delattre, A. Etilé, S. Franchoo, C. Gaulard, J. Guillot, F. Ibrahim, M. Lebois, M. MacCormick, N. Marginean, R. Marginean, M. Martini, C. Mihai, I. Mitu, L. Olivier, C. Portail, L. Qi, B. Roussière, L. Stan, D. Testov, J. Wilson, D.T. Yordanov

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Narrow exotic tetraquark mesons in large-N_c QCD

Discussing four-point Green functions of bilinear quark currents in large-N_c QCD, we formulate rigorous criteria for selecting diagrams appropriate for the analysis of potential tetraquark poles. We find that both flavor-exotic and cryptoexotic (i.e., flavor-nonexotic) tetraquarks, if such (...)

Hagop Sazdjian

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Delta(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI

We report on the investigation of Δ(1232) production and decay in proton-proton collisions at a kinetic energy of 1.25 GeV measured with HADES. Exclusive dilepton decay channels ppe+e− and ppe+e−γ have been studied and compared with the partial-wave analysis of the hadronic ppπ0 channel. They allow (...)

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Lee-Yang–inspired functional with a density-dependent neutron-neutron scattering length

Inspired by the low-density Lee-Yang expansion for the energy of a dilute Fermi gas of density ρ and momentum kF, we introduce here a Skyrme-type functional that contains only s-wave terms and provides, at the mean-field level, (i) a satisfactory equation of state (...)

M. Grasso, D. Lacroix, and C. J. Yang

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60 ans IPN Orsay/LAL

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Rencontres d’été de physique de l’infiniment grand à l’infiniment petit

16-27 juillet 2018, Orsay - Palaiseau - Paris Saclay

Les rencontres d’été de physique s’adressent à des étudiant(e)s de niveau L3 ou équivalent en physique (à l’université ou en première année d’école (...)

Journées Rencontres Jeunes Chercheurs

14-20 Octobre 2018, Lège Cap-Ferret

Les Journées de Rencontres Jeunes Chercheurs (JRJC) se dérouleront du 14 au 20 Octobre 2018 au village vacances de Lège Cap-Ferret (Gironde). (...)


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IPN

Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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