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News & Highlighted Publications

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LINO at ALTO passed the test run successfully

The spectrum shows the atomic hyperfine structure of the only naturally occurring isotope of sodium composed of 11 protons and 12 neutrons. The spacing between the resonances is determined by the magnetic moment of this nucleus, which is thus measured. The hyperfine splitting caused by the nuclear electromagnetism is extremely small, about a millionth of the transition energy. To achieve such precision, narrow-band lasers are used, and the atom-laser interaction is performed on a fast beam (...)

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Journées européennes du Patrimoine 2019

Journées européennes du Patrimoine : Dimanche 22 septembre après-midi, malgré la pluie, une quarantaine de personnes sont venues visiter le Linac. Cette impressionnante structure de cuivre, qui avait été la 1ere classée monument historique dans la catégorie instrument scientifique, est exposée sous vitrine extérieure en libre accès près du bâtiment 100 de l’IPN d’Orsay. Les visiteurs ont bénéficié des explications personnalisées de Denis Jouan, chercheur CNRS et chargé de mission Patrimoine à l’IPN. Ce (...)

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Probing dense baryon-rich matter with virtual photons

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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

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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

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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

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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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Publications

Design and characterization of a single photoelectron calibration system for the NectarCAM camera of the medium-sized telescopes of the Cherenkov Telescope Array

Abstract In this work, we describe the optical properties of the single photoelectron (SPE) calibration system designed for NectarCAM, a camera proposed for the Medium Sized Telescopes (MST) of the Cherenkov Telescope Array (CTA). One of the goals of the SPE system, as integral part of the NectarCAM camera, consists in measuring with high accuracy the gain of its photo-detection chain. The SPE system is based on a white painted screen where light pulses are injected through a (...)

Barbara Biasuzzi, Kevin Pressard, Jonathan Biteau, Brice Geoffroy, Carlos Domingues Goncalves, Giulia Hull, Miktat Imre, Michaël Josselin, Alain Maroni, Bernard Mathon, Lucien Seminor, Tiina Suomijarvi, Thi Nguyen Trung, Laurent Vatrinet

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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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IPN

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

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