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Publications récentes


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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New findings on structure and production of 10He from 11Li with the (d,3He) reaction

A. Matta, D. Beaumel, M. Assié, N. De Sereville, S. Franchoo, F. Hammache, E. Rindel, Ph Rosier, J.A. Scarpaci, I. Stefan, D. Suzuki

We present the first missing mass spectrum of the unbound nucleus 10He, measured at RIKEN using the11Li(d,3He) reaction at 50A MeV. 10He is believed to be a three-body 8He+n+n resonance beyond the limit of nuclear binding. Our observation of a new decay branch,6He+4n, and of a puzzling reduction of the11Li(d,3He)10He cross section challenges this view. Moreover, our experiment shows a new trend in the evolution of the proton spectroscopic strength in Li isotopes deduced from the (...)

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Evolution of single-particle strength in neutron-rich Cu-71

P. Morfouace, S. Franchoo, I. Matea, M. Niikura, I. Stefan, M. Assié, F. Azaiez, D. Beaumel, N. De Sereville, S. Giron, F. Hammache, A. Matta, J.A. Scarpaci

The strength functions of the pi f(5/2), pi p(3/2) and pi f(7/2) orbitals in neutron-rich Cu-71 were obtained in a Zn-72(d, He-3)Cu-71 proton pick-up reaction in inverse kinematics using a radioactive beam of Zn-72 at 38 MeV/u. A dedicated set-up was developed to overcome the experimental challenges posed by the low cross section of the reaction and the low energy of the outgoing 3He particles. The excitation-energy spectrum was reconstructed and spectroscopic factors were obtained (...)

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