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Competing Shapes in Neutron Rich Krypton Isotopes

An international team led by scientists from IPN Orsay (CNRS/Université Paris-Sud), CEA, and RIKEN (Japan) has performed the first spectroscopy of the extremely neutron-rich isotopes 98,100Kr. This experiment showed that there are two coexisting, competing quantum shapes at low energy in 98Kr, never before seen on this side of the isotopic chain. Furthermore, the team showed that these isotopes experience a gentle onset of deformation with added neutrons, in sharp contrast with their (...)

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An innovative technique to measure the isotope distributions from fission of 238U

J.N. Wilson, M. Lebois, L. Qi, et al.

Measurements of the mass and charge distributions of isotopes, produced when a heavy nucleus fissions into two lighter fragments, are important for several reasons. These include understanding the complex phenomenon of fission itself, the functioning of nuclear reactors, and the study of very neutron-rich nuclei, the precursors of the stable nuclei here on earth. In our recent article we report an (...)

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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 (...)

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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 (...)

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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 (...)

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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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