Top

News & Highlighted Publications

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 (...)

Read more



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 (...)

Read more



Ab initio predictions for polarized deuterium-tritium thermonuclear fusion

Vignette une

In an ab initio study based on the fundamental interaction between neutrons and protons, a team involving IPNO was able to test the validity of a 50-year-old working hypothesis that opens the way to enhanced yield for thermonuclear reactors of the future. At the ITER facility in France, a (...)

Read more



A record production of ultra-pure radioactive beams by laser ion source is obtained at ALTO

Vignette une

To push the studies of the structure of exotic nuclei further and further from stability, it is necessary to have recourse to more and more elaborate purification techniques. For these studies, the very short-lived nuclei are actually produced from very minority channel reactions. It is (...)

Read more



Vignette une

Traitement thermique des cavités ESS : un nouveau procédé testé et réussi à l’IPN

La division accélérateur a développé dans le cadre d’ESS un four dédié au traitement thermique à haute température (jusqu’à 1400°C) sous vide (10-6 mbar) des cavités radiofréquence supraconductrices en niobium. Ce four, qualifié avec succès en Mai 2016, permet grâce à ce recuit, de diminuer sensiblement le taux d’hydrogène interstitiel dans le niobium. Fig. 1 Insertion des cavités dans le four : a) cavité spoke ESS, b) cavité haut beta ESS Tous les traitements thermiques effectués à ce jour (plus de 15), à (...)

Read more



New methods to identify low energy 3He with Silicon-based detectors

Vignette une

The identification of low energy mass-3 nuclei is crucial for the study of nuclear structure via transfer reactions. For example, one nucleon transfer like (d,3He) and (d,t) give detailed information on the proton and neutron orbitals respectively. The paper gives a review of the present (...)

Read more



Publications

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

Read more



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

Read more



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

Read more



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

Read more



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

Read more



Meson-catalyzed fusion in ultradense plasmas

Abstract : "Negative muons in the MeV energy range can be fully stopped in warm dense matter. Mesonic catalysis of Deuterium-Tritium fusion reaction is shown to be possible in short-lived plasma targets, with rates that are orders of magnitude above cold deuterium reactions."

C. Deutsch, J. P. Didelez, A. Bendib, and K. Bendib-Kalache

Read more



Systematic study of giant quadrupole resonances with the subtracted second random-phase approximation: Beyond-mean-field centroids and fragmentation

Abstract: A systematic analysis of giant quadrupole resonances is performed for several nuclei, from 30Si to 208Pb, within the subtracted second random-phase-approximation (SSRPA) model in the framework of the energy-density-functional theory. Centroid energies and widths of the isoscalar giant quadrupole resonances are compared with the corresponding random-phase-approximation (RPA) values. We find lower SSRPA centroid energies compared to (...)

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

Read more



<:80 ans du CNRS:>

To be noted

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 (...)


Seminars

Leading logarithms in massless effective field theories in D = 2 and elliptic functions

Kirill Semenov-Tianski

St. Petersburg, INP & Ioffe Phys. Tech. Institute

le 25/04/2019 à 11:00

Ecole Polytechnique, CPhT, Salle des conférences, bât.6

Application of an ab-initio S-matrix to 2n transfer data populating bound states of 10Be and the continuum of 11Be

Angela Bonaccorso

INFN Pisa

le 10/05/2019 à 11:00

IPN Orsay, salle A018, bâtiment 100

Cosmic inflation after Planck

Jérôme Martin

Institut d'Astrophysique de Paris

le 14/05/2019 à 11:00

IPhT, CEA Saclay, amphi Claude Bloch, bât.772


Job offers


Works & Phd

There are 22 offers



 

IPN

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

Ce site est optimisé pour les navigateurs suivants Firefox, Chrome, Internet explore 9