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Publications récentes


Three-body model for an isoscalar spin-triplet neutron-proton pair in Sb102

Yusuke Tanimura and Hiroyuki Sagawa

We discuss the effect of a neutron-proton pair in the T=0,S=1 channel in the low-lying states of the Sb102=Sn100+p+n nucleus. To this end, we construct a core+p+n three-body model with a model space based on Skyrme and relativistic mean-field calculations. The latter model is found to be more realistic for the present case due to the pseudospin symmetry. It turns out that the (L,S,T)=(0,1,0) coupling scheme of valence nucleons is strongly hindered (...)

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Single-particle strength in neutron-rich Cu69 from the Zn70(d,He3)Cu69 proton pick-up reaction

P. Morfouace, S. Franchoo, K. Sieja, I. Stefan, N. de Séréville, F. Hammache, M. Assié, F. Azaiez, C. Borcea, R. Borcea, L. Grassi, J. Guillot, B. Le Crom, L. Lefebvre, I. Matea, D. Mengoni, D. Napoli, C. Petrone, M. Stanoiu, D. Suzuki, and D. Testov

We have performed the Zn70(d,He3)Cu69 proton pick-up reaction in direct kinematics using a deuteron beam at 27 MeV. The outgoing He3 particles were detected at the focal-plane detection system of an Enge split-pole spectrometer. The excitation-energy spectrum was reconstructed up to 7 MeV and spectroscopic factors were obtained after analysis of the angular distributions in the finite-range distorted-wave Born approximation. The results show three new angular (...)

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Second RPA calculations with the Skyrme and Gogny interactions

Danilo Gambacurta and Marcella Grasso

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 (...)

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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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