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News & Highlighted Publications

Probing dense baryon-rich matter with virtual photons

About 10 μs after the Big Bang, the universe was filled—in addition to photons and leptons—with strong-interaction matter consisting of quarks and gluons, which transitioned to hadrons at temperatures close to kT = 150 MeV and densities several times higher than those found in nuclei. This quantum (...)

A. Belounnas, T. Hennino, B. Ramstein, F. Scozzi

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ALICE Upgrade: jouvence des chambre à fils construites à l’IPN Orsay

ALICE detector is going through a major upgrade phase to enhance its readout speed at a level where ALICE will be capable to record all lead lead collisions produced at the LHC from 2021. A gain of a factor of 100 with respect to the current electronic is needed for the readout of the Muon (...)

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First Lights detected by NectarCam

The NectarCam mini-camera (CANEVAS project supported by LabEx P2IO) has been installed to the Medium Size Telescope (MST) prototype of the Cherenkov Telescope Array (CTA) at Adlershof, Berlin. During the night of May 22 to 23, NectarCam has detected the (...)

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Effective density functionals beyond mean field

This is a review on non relativistic effective energy–density functionals (EDFs). An introductory part is dedicated to traditional phenomenological functionals employed for mean-field-type applications and to several extensions and implementations that have been suggested over the years to (...)

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La transition de phase liquide-gaz des noyaux, comprise jusque dans ses détails

Mettre en évidence une transition de phase liquide-gaz dans les noyaux atomiques relevait du défi. En effet si cette transition était prédite pour la matière nucléaire en raison de la similarité de l’interaction nucléaire avec l’interaction van der Waals entre molécules d’un fluide, la taille finie des noyaux compliquait singulièrement la tâche. C’est pourquoi une vingtaine d’années d’efforts s’est avérée nécessaire pour aboutir à une compréhension approfondie. Elles ont mobilisé expérimentateurs et (...)

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L’IPN d’Orsay participe aux Masterclasses 2019

L’IPN d’Orsay a accueilli jeudi 28 mars une vingtaine d’élèves du lycée ECST d’Ozoir-la-Ferrière dans le cadre des Masterclasses CNRS-IN2P3 2019. Rappelons que ces journées sont réservées aux lycéens de classe terminale (voir 1ere) de la filière scientifique. Mises en place depuis 2005 et organisées dans plus de 40 pays, ces "Masterclasses" sont organisées par le CERN et le réseau IPOOG ; le programme éducatif pour la France est réalisé par le CNRS-IN2P3. Encadrés par l’équipe pédagogique du groupe (...)

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Publications

Soft breathing modes in neutron-rich nuclei with the subtracted second random-phase approximation

We analyze the isoscalar response related to breathing modes with particular attention being paid to low-lying excitations in neutron-rich nuclei. We use the subtracted second random-phase approximation (SSRPA) to describe microscopically the response. By increasing the neutron excess, we study the evolution of the response in Ca isotopes going from 40Ca to 48Ca and to 60Ca as well as in N=20 isotones going from 40Ca to 36S (...)

D. Gambacurta, M. Grasso, and O. Sorlin

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Nuclear jets in heavy-ion collisions

Head-on collisions between nuclei of different size at Fermi energies may give rise to extremely deformed dynamical regimes and patterns. Those latter, may suddenly turn into a stream of nuclear clusters, resembling collimated jets. This mechanism, which could be easily addressed in experiments, is simulated in the framework of stochastic one-body approaches. We employ the Boltzmann-Langevin equation to specifically address out-of-equilibrium conditions and handle dynamical fluctuations. (...)

P.Napolitani, M.Colonna

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Detection properties and internal activity of newly developed La-containing scintillator crystals

In this work we will present the characterization, in terms of gamma response and internal activity of newly developed crystals that contains Lanthanum in their chemical formula. In particular we tested two LaBr3:Ce,Sr, one CLLBC and two CLLB crystals with different volumes. These crystals just overcome the prototype stage and, even if the production in still not standardized at least for large optics, they have been very recently commercialized in sizes interesting for high-energy (...)

Giulia Hull, Michaël Josselin

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Study of light yield for different configurations of plastic scintillators and wavelength shifting fibers

Abstract In the effort of the AugerPrime scintillator surface detector R&D activity, we investigated the performances of different extruded and cast plastic scintillators that were read out with wavelength-shifting (WLS) optical fibers and then coupled to a PMT. In particular we compared the light yield of eighteen scintillator/fiber configurations, obtained combining eight different scintillator bars with six fiber types, in order to investigate which was satisfying the AugerPrime (...)

Giulia Hull, Miktat Imre, Michaël Josselin, Alain Maroni, Tiina Suomijärvi

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Spectroscopy of strongly deformed 32Ne by proton knockout reactions

Low-lying states of neutron-rich 32Ne were populated by means of one- and two-proton knockout reactions at the RIKEN Radioactive Isotope Beam Factory. A new transition is observed at 1410(15) keV and assigned to the 4+1→2+1 decay. With this energy the R4/2 ratio is calculated to be 2.99(6), lying close to the rigid rotor limit and suggests a high degree of collectivity and strongest deformation among neutron-rich neon isotopes. Comparisons of experimental inclusive and exclusive (...)

I. Murray, M. MacCormick

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Development of radioactive beams at ALTO: Part 2. Influence of the UCx target microstructure on the release properties of fission products

Abstract : Producing intense radioactive beams, in particular those consisting of short-lived isotopes requires the control of the release efficiency. The released fractions of 11 elements were measured on 14 samples that were characterized by various physicochemical analyses in a correlated paper (Part 1). A multivariate statistical approach, using the principal component analysis, was performed to highlight the impact of the microstructure on the (...)

Julien Guillot (a*), Brigitte Roussière (a), Sandrine Tusseau-Nenez (b), Denis Grebenkov (b), Nicole Barré-Boscher (a), Elie Borg (a), Julien Martin (a) (a) Institut de Physique Nucléaire d’Orsay CNRS/IN2P3 UMR 8608 - Université Paris Sud - Université Paris Saclay, F-91406 Orsay Cedex (b) Laboratoire de Physique de la Matière Condensée, CNRS, Ecole Polytechnique - Université Paris Saclay, Route de Saclay, F-91128 Palaiseau

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Beyond-mean-field effective masses in the nuclear Fermi liquid from axial breathing modes

Axial breathing modes are studied within the nuclear energy-density-functional theory to discuss the modification of the nucleon effective mass produced beyond the mean-field approximation. This analysis is performed with the subtracted second random-phase approximation (SSRPA) model applied to two nuclei, 48Ca and 90Zr. Analyzing the centroid energies of axial breathing modes obtained with the mean-field-based random-phase approximation and with the beyond-mean-field SSRPA model, we (...)

M. Grasso, D. Gambacurta, and O. Vasseur

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<:80 ans du CNRS:>

To be noted

2e réunion GT4 du GDR Résanet

Mardi 12 juin, IPN Orsay

La deuxième réunion du groupe de travail "astrophysique nucléaire" (GT4) du GDR-RESANET se (...)

Journée rencontres départements PHOM et P2I de l’UPsaclay

Jeudi 20 juin 2019

La journée de rencontres des départements PHOM et P2I de l’Université Paris-Saclay aura lieu jeudi (...)

NUSPIN2019

Réunion annuelle collaboration AGATA - 24 au 28 juin 2019

Le réseau d’instrumentation de spectroscopie nucléaire (NuSpIn), dans le cadre de l’ENSAR2 (...)

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

15-26 juillet 2019, Orsay - Palaiseau - Paris Saclay

La 9e édition des Rencontres de Physique de l’Infiniment grand à l’infiniment petit (...)

Face à l’Univers

14-15 septembre 2019, Campus CNRS de Gif-sur-Yvette

Plongez au coeur de la recherche spatiale ! Exposition d’instruments spatiaux et animations (...)

MDS2, 1ere conférence Mécanique des Détecteurs et Systèmes Similaires

7-8 octobre 2019, IPN Orsay

Les 7 et 8 octobre 2019, l’IPN d’Orsay, associé au réseau CNRS-IN2P3 et CEA des détecteurs gazeux, (...)


Seminars

Double séminaire : Phase diagrams of charged compact boson stars / Towards a quantum theory of gravity

Usha Kulshreshtha & Daya S. Kulshreshtha

University of Delhi

le 24/09/2019 à 11:00

IPN Orsay, salle A015, bâtiment 100

Quenching of the giant dipole resonance strength at high excitation energy

Domenico Santonocito

INFN-LNS

le 27/09/2019 à 11:00

IPN Orsay, salle A018, 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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