Top

Home page > Scientific news

Scientific news

Pages-1-2-3-

Vignette une

Microscopic Phase-Space Exploration Modeling of 258Fm Spontaneous Fission

Y. Tanimura, D. Lacroix and S. Ayik

The microscopic description of fission is one of the most challenging problem of nuclear theory. The complexity stems from the necessity to treat simultaneously the quantum nature of both single-particle and collective degrees of freedom as well as the nuclear superfluidity. A new approach has been proposed recently in IPN Orsay. In this approach, quantum effects in collective space are treated by initial fluctuations in the collective phase-space (...)

Read more


Vignette une

Des poussières interstellaires soumises au rayonnement cosmique : l’IPN participe à une simulation expérimentale de l’éjection de molécules carbonées par les grains interstellaires.

Les poussières interstellaires jouent un rôle essentiel dans l’équilibre radiatif des galaxies et naturellement dans l’apparence du ciel. Résultant de la condensation des gaz expulsés par les étoiles, elles sont de petits grains solides (composés essentiellement de carbone, d’oxygène, de silicium et de fer) dont les dimensions sont inférieures à un millionième de mètre. Une équipe de recherche multidisciplinaire* a caractérisé en laboratoire les effets des rayons cosmiques lourds sur le changement (...)

Read more


Vignette une

ALTO reveals shape coexistence close to 78Ni

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

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 disappearance, in certain neutron-rich nuclei, of magic numbers established for stable isotopes and the emergence of new magic numbers away from the valley of stability. Is such a change in the structure (...)

Read more


Vignette une

Probing clustering in excited alpha-conjugate nuclei

B. Borderie, G. Ademard, M.F. Rivet

The fragmentation of quasi-projectiles from the nuclear reaction 40Ca+12C at 25 MeV per nucleon bombarding energy was used to produce alpha-emission sources. From a careful selection of these sources provided by a complete detection and from comparisons with models of sequential and simultaneous decays, evidence in favor of alpha-particle clustering from excited 16O, 20Ne and 24Mg is (...)

Read more


Vignette une

Proton tomography at Jefferson Lab

The study of the inner structure of the nucleon is one of the main challenges in contemporary hadronic physics. In the last 15 years, the PHEN group at IPN carries out experiments at Jefferson Lab (JLab, USA), in particular to measure Deeply Virtual Compton Scattering (DVCS) (ep→e′p′γ), which gives access to the Generalized Parton Distributions (GPD) of the nucleon. The GPD formalism provides a universal description of the structure of the nucleon in terms of its constituents, the quarks and (...)

Read more



 

IPN

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

Ce site est optimisé pour les navigateurs suivants Firefox, Chrome, Internet explore 9