News & Highlighted Publications

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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Comprendre le processus de quasi-fission : Une étape essentielle pour la synthèse de nouveaux éléments super-lourds

Au cours d’une expérience réalisée auprès de l’accélérateur cryogénique de l’Australian National University (Canberra, Australie), une collaboration franco-australienne1 a pour la première fois identifié simultanément en masse et en numéro atomique Z jusqu’au plutonium, les fragments créés dans des réactions de quasi-fission. La quasi-fission est le mécanisme dominant dans les collisions très dissipatives entre noyaux très lourds. Elle est en compétition avec le mécanisme de fusion utilisé pour synthétiser de (...)

PHYS. REV. LETT. 119, 222502 (2017)

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"One of the most important properties of nuclei is saturation : although nuclear interactions are attractive overall, the growth in binding energy tapers off as the number of nucleons in the nucleus increases. As a consequence, heavy nuclei have some properties of a liquid drop. The simplest nucleus --- the deuteron --- has a small binding energy, which has led to a recent suggestion by Bira van Kolck and collaborators that nuclei can be described in a systematic expansion around the (...)

PHYS. REV. LETT. 119, 223002 (2017)

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IPN Orsay involved in the first Spectroscopy of 79Cu held with success at Riken

The 78Ni nucleus, with 28 protons and 50 neutrons, is a cornerstone for nuclear structure as it is one of the most exotic nuclei with two magic numbers. The study of its proton-neighbour 79Cu allows to understand the movement of a single proton around 78Ni and it is therefore a powerful tool (...)

Phys. Rev. Lett. 119, 192501 (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

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 (...)


Neutrinoless double beta decay in effective field theory

Jordy de Vries

NIKHEF Amsterdam

le 24/05/2018 à 11:00

IPN Orsay, salle A015, bâtiment 100

Compressed Baryonic Matter

Joachim Stroth

Goethe University - GSI Darmstadt

le 24/05/2018 à 14:00

IPN Orsay, salle des Conseils, bâtiment 100

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

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