Festival of Science 2016

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IPN has opened its doors to the general public as usual for the Festival of Science organized with twenty other laboratories on the campus of Orsay. Objective met : more than a hundred visitors including half of children came to IPN to discover the little practical workshops for the 5-12 (...)

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

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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

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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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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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Second-order equation of state with the Skyrme interaction: Cutoff and dimensional regularization with the inclusion of rearrangement terms

We evaluate the second-order (beyond-mean-field) contribution to the equation of state of nuclear matter with the effective Skyrme force and use cutoff and dimensional regularizations to treat the ultraviolet divergence produced by the zero-range character of this interaction. An adjustment of the force parameters is then performed in both cases to remove any double counting generated by the explicit computation of beyond-mean-field corrections with the (...)

C. J. Yang, M. Grasso, X. Roca-Maza, G. Colò, and K. Moghrabi

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From dilute matter to the equilibrium point in the energy-density-functional theory

Due to the large value of the scattering length in nuclear systems, standard density-functional theories based on effective interactions usually fail to reproduce the nuclear Fermi-liquid behavior both at very low densities and close to equilibrium. Guided on one side by the success of the Skyrme density functional and, on the other side, by resummation techniques used in effective field theories for systems with large scattering lengths, a new (...)

C. J. Yang, M. Grasso, and D. Lacroix

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Spin-orbit interaction in relativistic nuclear structure models

Relativistic self-consistent mean-field (SCMF) models naturally account for the coupling of the nucleon spin to its orbital motion, whereas nonrelativistic SCMF methods necessitate a phenomenological ansatz for the effective spin-orbit potential. Recent experimental studies aim to explore the isospin properties of the effective spin-orbit interaction in nuclei. SCMF models are very useful in the interpretation of the corresponding data ; however, standard (...)

J.-P. Ebran, A. Mutschler, E. Khan, and D. Vretenar

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

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 (...)

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

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

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 (...)

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

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

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 (...)

Yusuke Tanimura and Hiroyuki Sagawa

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

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 (...)

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

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