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News & Highlighted Publications

Precision Measurement of the First Ionization Potential of Nobelium

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 lead to unique chemical properties. Applying the sensitive Radiation Detected Resonance Ionization Spectroscopy (RADRIS) technique at the SHIP velocity filter at GSI, allowed probing the optical (...)

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Probing Sizes and Shapes of Nobelium Isotopes by Laser Spectroscopy

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 effects and highly correlated systems. These studies are hampered by low production rates and the fact that atomic information is only available from theoretical predictions. Only recently, optical (...)

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A new leading contribution to neutrinoless double-beta decay

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. However, the origin of neutrino masses remains a mystery. They can arise from an interaction with the Higgs field that violates lepton number, makes neutrinos Majorana particles, and potentially (...)

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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IPN Orsay collaborates on first MRTOF-MS experiments at RIKEN-RIBF

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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IPN Orsay delivered the klystrons for the FAIR project at GSI

As part of the FAIR project, a proton linac (pLinac) is planned to accelerate protons up to 70 MeV. The duration of the pulse beam is 70 μs and the current during the pulse is 70 mA. The linac will consist of an RFQ and 6 cavities Crossed-bar-H (CH) accelerating the beam to its final energy. The (...)

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

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 accessible via the study of generalized parton distributions (GPDs), which we probe with hard exclusive scattering reactions. Deeply-virtual Compton scattering (DVCS) reaction is the preferred probe of GPDs (...)

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

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Publications

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 are included, leading to a fully self-consistent scheme. Results are illustrated with two Skyrme parametrizations, SGII and SLy4. Those obtained with the SGII interaction are particularly (...)

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 14,16,18O as a well-delimited subject for a study of the sensitivity of such analyses to different choices of distorting potentials and overlap functions with particular reference to a previous (...)

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 in particle accelerators at around 30 to 50 MeV per nucleon : in this conditions, after the initial collision shock, the nucleus expands and then clusterizes into several smaller nuclear fragments. (...)

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 has been measured to be 56–85% of the decay path, in this experiment an unexpected high-energy 5–9 MeV γ -ray yield of 16(4)% was observed, coming from states several MeVs above the (...)

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 poles exist, have a width of order O(1/N_c^2), so they are parametrically narrower compared to the ordinary mesons, which have a width of order O(1/N_c). Moreover, for flavor-exotic states, the (...)

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 to access both Δ+→pπ0(e+e−γ) and Δ+→pe+e− Dalitz decay channels. The perfect reconstruction of the well-known π0 Dalitz decay serves as a proof of the consistency of the analysis. The Δ Dalitz decay is (...)

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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 for neutron matter from extremely low densities up to densities close to the equilibrium point, and (ii) a good-quality equation of state for symmetric matter at density scales around (...)

M. Grasso, D. Lacroix, and C. J. Yang

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60 ans IPN Orsay/LAL

To be noted

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 (...)

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 (...)


Seminars

The structure of Xi hypernuclei

Emiko Hiyama

RIKEN

le 16/07/2018 à 11:30

IPN Orsay, salle A015, bâtiment 100

Hadron interactions from lattice QCD - application to hadron resonances

Yoichi Ikeda

RCNP, Osaka University

le 16/07/2018 à 14:30

IPN Orsay, salle A015, bâtiment 100

New results from a number operator interpretation of the compositeness of bound and resonant states

José A. Oller

Universidad de Murcia

le 17/07/2018 à 14:30

IPN Orsay, salle A015, bâtiment 100

Nuclear structure and reactions using lattice effective field theory

Gautam Rupak

Department of Physics and Astronomy, Mississippi State University

le 18/07/2018 à 11:30

IPN Orsay, salle A015, bâtiment 100


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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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