News & Highlighted Publications

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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

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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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IPN Orsay delivered the klystrons for the FAIR project at GSI

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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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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

Discours d’Emmanuel Macron lors de sa visite au campus Paris-Saclay

Le Président de la République, Emmanuel Macron, s’est rendu le 25 octobre dernier sur le campus (...)

Forum CNRS

25 et 26 novembre

Le Forum du CNRS est l’occasion de réunir une centaine de chercheurs afin de partager leurs (...)

150e anniversaire naissance de Marie Curie


A l’occasion du 150e anniversaire de la naissance de Marie Curie, divers événements ont marqué (...)

Jana Crkovska, doctorante IPN, talent P2IO

Jana Crkovska est doctorante à l’IPN au sein du groupe PHEN. Elle étudie la production du charme (...)

Workshop on ALTO prospects

February 5-7, 2018

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ALTO 2.0 is the project of reliability and sustainability & physics program of ALTO within (...)

ALTO Program Advisory Committee

12 th March, 2018 - IPN Orsay/Auditorium Irène Joliot-Curie


Séminaire doctorants (2e année) de l’IPN

Jeudi 22 mars, 10h00 - Auditorium Irène Joliot-Curie, bât.100

Nouveau ! L’IPN propose à ses doctorants (de seconde année) de présenter au cours de 3 (...)

Séminaire doctorants (2e année) de l’IPN

Jeudi 5 avril, 10h00 - Auditorium Irène Joliot-Curie, bât.100

Les doctorants (seconde année) de l’IPN présentent le sujet de leur thèse, ses spécificités et les (...)

26e colloque jeunes chercheurs Alain Bouyssy

Prix du meilleur poster à R. Lasseri, doctorant IPN Orsay

La 26e édition du colloque Jeunes Chercheurs Alain Bouyssy, organisé par le Département de (...)

Séminaire doctorants 2e année de l’IPN

Jeudi 19 avril, 10h00 - Auditorium Irène Joliot-Curie, bât.100

Les doctorants (seconde année) de l’IPN présentent le sujet de leur thèse, ses spécificités et les (...)

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

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

La 8e édition des Rencontres de Physique de l’Infiniment grand à l’infiniment petit (...)

Réunion du Consortium CTA (Cherenkov Telescope Array)

14-18 mai 2018

L’IPN d’Orsay, en partenariat avec le CEA-IRFU et le LLR Palaiseau, organise la réunion (...)

PHENIICS Fest - Edition 2018

May 28-29, 2018 – LAL, bât.200

PHENIICS Fest is a two day event organized by the students, for students of the Ecole (...)

Workshop Perspectives 4e édition

Paris, 22-23 juin 2018, campus Jussieu UPMC

L’association D2I2, Doctorants et Docteurs des Deux Infinis, qui vise à mettre en relation les (...)

Ecole Joliot-Curie 2018 (EJC2018)

October 7-12, La Grande Motte

The 37th edition of the Joliot-Curie International School, entitled "Correlataions between (...)

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 (...)


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Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
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