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Publications récentes

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Neutron-rich nuclei produced at zero degrees in damped collisions induced by a beam of 18O on a 238U target

I. Stefan et al.

Cross sections and corresponding momentum distributions have been measured for the first time at zero degrees for the exotic nuclei obtained from a beam of 18O at 8.5 MeV/A impinging on a 1 mg/cm2238U target. Sizable cross sections were found for the production of exotic species arising from the neutron transfer and proton removal from the projectile. Comparisons of experimental results with calculations based on deep-inelastic reaction models, (...)

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Pinning down the linearly-polarised gluons inside unpolarised protons using quarkonium-pair production at the LHC

Jean-Philippe Lansberg,Cristian Pisano,Florent Scarpa,Marc Schlegel

We show that the production of J/ψ or ϒ pairs in unpolarised pp collisions is currently the best process to measure the momentum distribution of linearly-polarised gluons inside unpolarised protons through the study of azimuthal asymmetries. Not only the short-distance coefficients for such reactions induce the largest possible cos4ϕ modulations, but analysed data are already available. Among the various final states previously studied in unpolarised (...)

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Electric dipole strength and dipole polarizability in 48Ca within a fully self-consistent second random–phase approximation

D. Gambacurta, M. Grasso, O. Vasseur

The second random–phase–approximation model corrected by a subtraction procedure designed to cure double counting, instabilities, and ultraviolet divergences, is employed for the first time to analyze the dipole strength and polarizability in 48Ca. All the terms of the residual interaction are included, leading to a fully self-consistent scheme. Results are illustrated with two Skyrme parametrizations, SGII and SLy4. Those obtained with the SGII interaction are particularly (...)

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Single-particle strength from nucleon transfer in oxygen > isotopes : Sensitivity to model parameters

F. Flavigny, N. Keeley, A. Gillibert, and A. Obertelli

In the analysis of transfer reaction data to extract nuclear structure information the choice of input parameters to the reaction model such as distorting potentials and overlap functions has a significant impact. In this paper we consider a set of data for the (d,t) and (d,3He) reactions on 14,16,18O as a well-delimited subject for a study of the sensitivity of such analyses to different choices of distorting potentials and overlap functions with particular reference to a previous (...)

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Violent fluctuations in fluids of neutrons and protons explain how atomic nuclei disintegrate

P. Napolitani and M. Colonna

Perturbing fluids of neutrons and protons (nuclear matter) may lead, as the most catastrophic effect, to the rearrangement of the fluid into clusters of nucleons. A similar process may occur in a single atomic nucleus undergoing a violent perturbation, like in heavy-ion collisions tracked in particle accelerators at around 30 to 50 MeV per nucleon : in this conditions, after the initial collision shock, the nucleus expands and then clusterizes into several smaller nuclear fragments. (...)

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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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