A new record for the spoke superconducting cavities for the European Spallation Source (ESS)

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In the framework of the French contribution to the construction of ESS, the future European neutron spallation source, IPN Orsay is in charge in particular of the design and construction of the intermediate energy section (90 to 220 MeV) of the proton accelerator. This section is based on (...)

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Céromonie de remise de prix SFP

La cérémonie de remise des prix Langevin et Joliot-Curie 2015 de la Société Française de Physique a eu lieu à l’IPN d’Orsay le 19 décembre, en présence de Michel Spiro, Président de la SFP, et de Michel Guidal, prochain directeur de l’IPN qui prendra ses fonctions officiellement le 1er janvier 2017. Cet événement, co-organisé par l’IPN et les divisions de Physique Nucléaire & Champs et Particules de la SFP, a récompensé les lauréats Ubirajara Van Kolck (IPN Orsay), François Gélis (IPhT Saclay) et (...)

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Scientific news

ALTO reveals shape coexistence close to 78Ni

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The observation of a deformed ground state in 32Mg (N = 20) and the existence of shape coexistence in 44S (N = 28), nuclei with magic numbers of neutrons and thus expected spherical, has deeply revolutionized the understanding of the structure of neutron-rich nuclei. It highlights the (...)

A. Gottardo, D. Verney, C. Delafosse, F. Ibrahim, B. Roussière, C. Sotty, S. Roccia, C. Andreoiu, C. Costache, M.-C. Delattre, I. Deloncle, A. Etilé, S. Franchoo, C. Gaulard, J. Guillot, M. Lebois, M. MacCormick, N. Marginean, R. Marginean, I. Matea, C. Mihai, I. Mitu, L. Olivier, C. Portail, L. Qi, L. Stan, D. Testov, J. Wilson, and D. T. Yordanov

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Tomographic image of the proton

We have carried out a phenomenological analysis of the latest deep virtual Compton scattering experimental data based on the generalized parton distribution formalism. This allows us to extract the dependence of the spatial size of the proton on the quark’s longitudinal momentum. This results in the first continuous two-dimensional momentum-space image and tomography of the proton based on experimental (...)

R. Dupré, M. Guidal, and M. Vanderhaeghen

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Chiral potential renormalized in harmonic-oscillator space

We renormalize the chiral effective field theory potential in harmonic-oscillator (HO) model space. The low energy constants (LECs) are utilized to absorb not just the ultraviolet part of the physics due to the cutoff, but also the infrared part due to the truncation of model space. We use the inverse J-matrix method to reproduce the nucleon-nucleon scattering phase shifts in the given model space. We demonstrate that by including the NLO correction, the nucleon-nucleon scattering in (...)

C.-J. Yang

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Rosenbluth Separation of the Pi 0 Electroproduction Cross Section

We present deeply virtual π0 electroproduction cross-section measurements at xB=0.36 and three different Q2 values ranging from 1.5 to 2  GeV2, obtained from Jefferson Lab Hall A experiment E07-007. The Rosenbluth technique is used to separate the longitudinal and transverse responses. Results demonstrate that the cross section is dominated by its transverse component and, thus, is far from the asymptotic limit predicted by perturbative quantum chromodynamics. Nonetheless, an indication (...)

M. Defurne et al. (Jefferson Lab Hall A Collaboration)

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Density-functional theory for resonantly interacting fermions with effective range and neutron matter

A density-functional theory is proposed for strongly interacting fermions with arbitrary large negative scattering length. The functional has only two parameters that are directly fixed to reproduce the universal properties of unitary gas : the so-called Bertsch parameter ξ0 and a parameter ηe related to the possible influence of the effective range re at infinite scattering length a. Using most recent quantum Monte Carlo (QMC) estimates of (...)

Denis Lacroix

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Extraction of pure transfer probabilities from experimental transfer and capture data

A new method is suggested to extract pure transfer probabilities from the experimental data. For the Ca40+Zr96 reaction at sub-barrier energies, the one- and two-neutron transfer probabilities at backward angle are extracted from the experimental capture (fusion) and transfer excitation functions. The pure one- and two-neutron transfer probabilities are shown to be close at the (...)

G. Scamps, V. V. Sargsyan, G. G. Adamian, N. V. Antonenko, and D. Lacroix

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J/ψ suppression at forward rapidity in Pb-Pb collisions at √sNN=5.02 TeV

The inclusive J/ψ production has been studied in Pn-Pb and pp collisions at the centre-of-mass energy per nucleon pair √sNN=5.02 TeV, using the ALICE detector at the CERN LHC. The J/ψ meson is reconstructed, in the centre-of-mass rapidity interval 2.5<y<4 and in the transverse-momentum range pT<12 GeV/c, via its decay to a muon pair. In this Letter, we present results on the inclusive J/ψ cross section in pp collisions at s√=5.02 TeV and on the nuclear modification factor RAA. The (...)

ALICE publications, CERN-EP-2016-162

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Effective field theory for few-boson systems

We study universal bosonic few-body systems within the framework of effective field theory at leading order (LO). We calculate binding energies of systems of up to six particles and the atom-dimer scattering length. Convergence to the limit of zero-range two- and three-body interactions is shown, indicating that no additional few-body interactions need to be introduced at LO. Generalizations of the Tjon line are constructed, showing correlations between few-body binding energies and the (...)

Betzalel Bazak, Moti Eliyahu, and Ubirajara van Kolck

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

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