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Publications récentes

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Molecular bremsstrahlung radiation at GHz frequencies in air

O. Deligny

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 (...)

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Strong three-meson couplings of J/psi and eta_c

H. Sazdjian

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 (...)

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

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

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 (...)

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Nuclear excitations as coupled one and two random-phase-approximation modes

M. Grasso

We present an extension of the random-phase approximation (RPA) where the RPA phonons are used as building blocks to construct the excited states. In our model, that we call double RPA (DRPA), we include up to two RPA phonons. This is an approximate and simplified way, with respect to the full second random-phase approximation (SRPA), to extend the RPA by including two-particle–two-hole configurations. Some limitations of the standard SRPA model, related to the violation of the (...)

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Characterization of uranium carbide target materials to produce neutron-rich radioactive beams

S. Tusseau-Nenez, B. Roussière, N. Barré-Boscher, M. Cheikh Mhamed, S. Essabaa, Ch. Lau, M. Raynaud, A. Said

In the framework of a R&D program aiming to develop uranium carbide (UCx) targets for radioactive nuclear beams, the Institut de Physique Nucléaire d’Orsay (IPNO) has developed an experimental setup to characterize the release of various fission fragments from UCx samples at high temperature. The results obtained in a previous study have demonstrated the feasibility of the method and started to correlate the structural properties of the samples and their behavior in terms of (...)

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IPN

Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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