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 512 (...)
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 (CNRSIN2P3 IPN Orsay) and François Gélis (CEA IphT) have just been named winners of the (...)
Elias Khan, Professor at the Université ParisSud, 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 (...)
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 neutronrich 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
We evaluate the secondorder (beyondmeanfield) 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 zerorange 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 beyondmeanfield corrections with the (...)
C. J. Yang, M. Grasso, X. RocaMaza, G. Colò, and K. Moghrabi
Due to the large value of the scattering length in nuclear systems, standard densityfunctional theories based on effective interactions usually fail to reproduce the nuclear Fermiliquid 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
Relativistic selfconsistent meanfield (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 spinorbit potential. Recent experimental studies aim to explore the isospin properties of the effective spinorbit 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
Elastic pionnucleon scattering is analyzed in the framework of chiral perturbation theory up to fourth order within the heavybaryon expansion and a covariant approach based on an extended onmassshell renormalization scheme. We discuss in detail the renormalization of the various lowenergy constants and provide explicit expressions for the relevant β functions and the finite subtractions of the powercounting breaking terms within the covariant (...)
D. Siemens, V. Bernard, E. Epelbaum, A. Gasparyan, H. Krebs, and UlfG. Meißner
The neutron decay of the resonant states of light neutronrich 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 twoneutron transfer reaction C13(O18,O16n) at 84MeV 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
We discuss the effect of a neutronproton pair in the T=0,S=1 channel in the lowlying states of the Sb102=Sn100+p+n nucleus. To this end, we construct a core+p+n threebody model with a model space based on Skyrme and relativistic meanfield 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
We have performed the Zn70(d,He3)Cu69 proton pickup reaction in direct kinematics using a deuteron beam at 27 MeV. The outgoing He3 particles were detected at the focalplane detection system of an Enge splitpole spectrometer. The excitationenergy spectrum was reconstructed up to 7 MeV and spectroscopic factors were obtained after analysis of the angular distributions in the finiterange distortedwave 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
Benjamin Bally
CEA/IRFU/SPHN
le 26/10/2016 à 11:30
IPN, Batiment 100A, Salle E
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