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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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Publications

Production of highly polarized positrons using polarized electrons at MeV energies

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 (...)

D. Abbott, et al. (PEPPo collaboration)

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

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 (...)

M. Grasso, D. Lacroix, U. van Kolck

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Molecular bremsstrahlung radiation at GHz frequencies in air

A detection technique for ultra-high-energy cosmic rays, complementary to the fluorescence technique, would be the use of the molecular Bremstrahlung radiation emitted by low-energy ionization electrons left after the passage of the showers in the atmosphere. In this article, a detailed estimate of the spectral intensity of photons at ground level originating from this radiation is presented. The spectral intensity expected from the passage of the high-energy electrons of the cascade (...)

O. Deligny

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Strong three-meson couplings of J/psi and eta_c

We discuss the strong couplings g_PPV and g_VVP for vector (V) and pseudoscalar (P) mesons, at least one of which is a charmonium state J/psi or eta_c. The strong couplings are obtained as residues at the poles of suitable form factors, calculated in a broad range of momentum transfers using a dispersion formulation of the relativistic constituent quark model. The form factors obtained in this approach satisfy all constraints known for these quantities in the heavy-quark limit. Our results (...)

H. Sazdjian

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The 3He long-counter TETRA at the ALTO ISOL facility

A new β-decay station (BEDO) has been installed behind the PARRNe mass separator operated on-line at the electron-driven ALTO ISOL facility. The station is equipped with a movable tape collector allowing the creation of the radioactive sources of interest at the very center of a modular detection system. The mechanical structure was designed to host various assemblies of detectors in compact geometry. We report here the first on-line use of this system equipped with the 4π 3He neutron counter (...)

D. Testov, D. Verney, B. Roussière, J. Bettane, S. Franchoo, F. Ibrahim, R. Li, I. Matea, I. Stefan, D. Suzuki, J. Wilson

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