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News & Highlighted Publications

Ab initio predictions for polarized deuterium-tritium thermonuclear fusion

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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 (...)

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

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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 (...)

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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 (...)

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

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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 (...)

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IPNO at RADECS2018 conference: a way of promoting ALTO facility

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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 (...)

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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 (...)

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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

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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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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

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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

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IPN

Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
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