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Publications récentes

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

M. Mazouz, L. Ghedira, E. Voutier

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 (...)

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Gogny interactions with tensor terms

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

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 (...)

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Experimental overview of Deeply Virtual Compton Scattering

N. D’Hose, S. Niccolai, A. Rostomyan

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.

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Production of highly polarized positrons using polarized electrons at MeV energies

D. Abbott, et al. (PEPPo collaboration)

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 (...)

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From effective field theories to effective density functionals in and beyond the mean field

M. Grasso, D. Lacroix, U. van Kolck

Since the 1975 Nobel Prize in Physics, nuclear theory has evolved along two main directions. On the one hand, the energy–density functional (EDF) theory was established, which presently encompasses (by enlarging the EDF framework) all the mean-field and beyond-mean-field theories based on energy functionals produced by effective phenomenological interactions. Highly sophisticated structure and reaction models are currently available for the treatment of (...)

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