Bira van Kolck, laureate of the Langevin Prize 2015 of the SFP

The prestigious Langevin Prize of the French Physical Society rewards the work of a distinguished theorist ; this prize had not been assigned for several years. Bira van Kolck (CNRS-IN2P3 IPN Orsay) and François Gélis (CEA IphT) have just been named winners of the (...)

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Elias Khan, Laureate of the CNRS Silver Medal 2016

Elias Khan, Professor at the Université Paris-Sud, is a nuclear physicist of wide international reputation. He is outstanding for his rare approach to research from multiple angles : experiment, theory, and applications. As an experimentalist, he was able to tackle original (...)

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IPN Orsay and the ESS French Partner days

On February 4th, the laboratory visit part of the ESS French Partner event exhibited the impressive facilities at Institut de Physique Nucléaire d’Orsay (IPNO), Laboratoire Léon Brillouin (LLB) and IRFU Saclay the many participants from French institutes and industry. The tour of the laboratories (...)

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Scientific news

ALTO reveals shape coexistence close to 78Ni

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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Second RPA calculations with the Skyrme and Gogny interactions

The Second Random Phase Approximation (SRPA) is a natural extension of RPA where more general excitation operators are introduced. These operators contain, in addition to the one particle-one hole configurations already considered in RPA, also two particle-two hole excitations. Only in the last years, large-scale SRPA calculations have been performed, showing the merits and limits of this approach. In the first part of this paper, we present an (...)

Danilo Gambacurta and Marcella Grasso

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Determination of shower central position in laterally segmented lead-fluoride electromagnetic calorimeters

The spatial resolution of laterally segmented electromagnetic calorimeters, built of lead fluoride material, is studied on the basis of Monte-Carlo simulations. Parametrization of the relative resolution on the shower position is proposed and optimized in terms of the energy of incoming particles and the elementary size of the calorimeter blocks. A new fit algorithm method is proposed that improves spatial resolution at high energies (> 5 GeV), and provides guidance for the design (...)

M. Mazouz, L. Ghedira, E. Voutier

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Gogny interactions with tensor terms

We present a perturbative approach to include tensor terms in the Gogny interaction. We do not change the values of the usual parameterisations, with the only exception of the spin-orbit term, and we add tensor terms whose only free parameters are the strengths of the interactions. We identify observables sensitive to the presence of the tensor force in Hartree-Fock, Hartree-Fock-Bogoliubov and random phase approximation calculations. We show the need of (...)

M. Anguiano, A. M. Lallena, G. Co’, V. De Donno, M. Grasso and R. N. Bernard

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Experimental overview of Deeply Virtual Compton Scattering

Deeply Virtual Compton Scattering (DVCS) is a key reaction to gain information on Generalized Parton Distributions. In this paper the existing measurements of DVCS on the nucleon, as well as those planned for the near future, are presented and discussed.

N. D’Hose, S. Niccolai, A. Rostomyan

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Production of highly polarized positrons using polarized electrons at MeV energies

The Polarized Electrons for Polarized Positrons experiment at the injector of the Continuous Electron Beam Accelerator Facility has demonstrated for the first time the efficient transfer of polarization from electrons to positrons produced by the polarized bremsstrahlung radiation induced by a polarized electron beam in a high-Z target. Positron polarization up to 82% have been measured for an initial electron beam momentum of 8.19 MeV/c, limited only by the electron beam polarization. This (...)

D. Abbott, et al. (PEPPo collaboration)

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