Top

News & Highlighted Publications

Vignette une

Un record de production de faisceaux radioactifs ultra-purs par source d’ions laser est obtenu à ALTO

Pour pousser les études de structure des noyaux exotiques de plus en plus loin de la stabilité, il est nécessaire de recourir à des techniques de purification de plus en plus élaborées. Pour ces études, les noyaux de très faibles de durées de vie d’intérêt sont en effet issus de voies de réactions nucléaires très minoritaires. Il est nécessaire de les isoler des autres noyaux produits afin d’atteindre un rapport signal sur fond permettant leur identification sans ambiguïté et d’obtenir les signaux de (...)

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



IPNO at RADECS2018 conference: a way of promoting ALTO facility

Vignette une

In order to open the ALTO platform to external services, our laboratory participated in the most important conference on RADiation Effects on Components and Systems (RADECS). The conference was held from 16 to 21 September in Gothenburg, where more than 500 participants, including major players (...)

Read more



Peter Schuck, lauréat du Prix Lise Meitner 2018 de l’EPS

Peter Schuck, chercheur auprès du groupe de Physique Théorique de l’IPN d’Orsay, a reçu conjointement avec Peter Ring de TU Münich, le Prix Lise Meitner 2018 attribué tous les deux ans par la Division de Physique Nucléaire de l’EPS (European Physical Society). Ce prix, qui lui a été remis au cours de la conférence EUNPC en septembre dernier, récompense ses travaux sur les systèmes à N-corps en physique nucléaire, notamment les nouvelles approches qu’il a introduites en connexion avec la superfluidité (...)

Read more



Gluon Shadowing in Heavy-Flavor Production at the LHC

Vignette une

We study the relevance of experimental data on heavy-flavor [D0, J/ψ, B→J/ψ and Υ(1S) mesons] production in proton-lead collisions at the LHC to improve our knowledge of the gluon-momentum distribution inside heavy nuclei. We observe that the nuclear effects encoded in both most recent global (...)

Read more



Publications

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



The central neutron detector for CLAS12

Abstract The Central Neutron Detector, a recently constructed scintillator barrel which is used in CLAS12 at Jefferson Lab to detect 0.2–1 GeV neutrons at backwards angles, is here described. The motivations and R&D tests leading to its final design, based on three radial layers of coupled paddles with one-side light readout by photomultipliers plus “U-turn” lightguides on the other side, are outlined. The performance of the detector, evaluated from cosmic-ray tests and (...)

S. Niccolai, G. Hull, J. Bettane, P. Chatagnon, B. Garillon, B. Genolini, B. Guegan, M. Guidal, M. Imre, M. Josselin, D. Marchand, A. Maroni, B. Mathon, G. Murdoch, T. Nguyen Trung, J. Peyré, J. Pouthas, P. Rosier, D. Sokhan, C. Theneau, R.Wang

Read more



Phase transition dynamics for hot nuclei: a definitive answer

An abnormal production of events with almost equal-sized fragments was theoretically proposed as a signature of spinodal instabilities responsible for nuclear multifragmentation in the Fermi energy domain. On the other hand finite size effects are predicted to strongly reduce this abnormal production. High statistics quasifusion hot nuclei produced in central collisions between Xe and Sn isotopes at 32 and 45 AMeV incident energies have been used to definitively establish, through the (...)

B. Borderie, N. Le Neindre, E. Galichet , P. Napolitani et al

Read more



Mapping the demise of collective motion in nuclei at high excitation energy

Abstract High energy gamma-rays from the 116Sn + 24Mg reaction at 23A MeV were measured using the MEDEA detector at LNS – INFN Catania. Combining this new data with previous measurements yields a detailed view of the quenching of the Giant Dipole Resonance as a function of excitation energy in nuclei of mass A in the range 120&#xF7 ;132" role="presentation"> The transition towards the disappearance of the dipole strength, which occurs around 230 MeV excitation energy, appears to (...)

D. Santonocito, Y. Blumenfeld, …, C. Monrozeau et al

Read more



60 ans IPN Orsay/LAL

To be noted

Congrès général 2019 de la SFP

8-12 juillet 2019, Cité des congrès de Nantes

Vignette une

Organisé tous les deux ans, le Congrès Général de la Société Française de Physique offre un panorama (...)


Seminars

Physics Opportunities with the S3 Low-Energy Branch

Piet Van Duppen

KU Leuven

le 14/12/2018 à 11:00

IPN Orsay, salle des Conseils, bâtiment 100

Quasi-particle properties of Fermi gases close to unitarity

Antoine Boulet

IPN Orsay

le 19/12/2018 à 11:30

IPN Orsay, salle A015, bâtiment 100

Cluster radioactivity of super-heavy nuclei

Anna Zdeb

CEA Saclay

le 16/01/2019 à 11:30

IPN Orsay, salle A015, bâtiment 100


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