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Publications récentes

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Elastic pion-nucleon scattering in chiral perturbation theory : A fresh look

D. Siemens, V. Bernard, E. Epelbaum, A. Gasparyan, H. Krebs, and Ulf-G. Meißner

Elastic pion-nucleon scattering is analyzed in the framework of chiral perturbation theory up to fourth order within the heavy-baryon expansion and a covariant approach based on an extended on-mass-shell renormalization scheme. We discuss in detail the renormalization of the various low-energy constants and provide explicit expressions for the relevant β functions and the finite subtractions of the power-counting breaking terms within the covariant (...)

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Neutron decay of C15 resonances by measurements of neutron time-of-flight

M. Cavallaro, C. Agodi, M. Assié, F. Azaiez, F. Cappuzzello, D. Carbone, N. de Séréville, A. Foti, L. Pandola, J. A. Scarpaci, O. Sgouros, V. Soukeras, and S. Tropea

The neutron decay of the resonant states of light neutron-rich nuclei is an important and poorly explored property, useful to extract valuable nuclear structure information. In the present paper the neutron decay of the C15 resonances populated via the two-neutron transfer reaction C13(O18,O16n) at 84-MeV incident energy is reported for the first time using an innovative technique which couples the MAGNEX magnetic spectrometer and the EDEN neutron (...)

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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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