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IPN Orsay involved in the first Spectroscopy of 79Cu held with success at Riken

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The 78Ni nucleus, with 28 protons and 50 neutrons, is a cornerstone for nuclear structure as it is one of the most exotic nuclei with two magic numbers. The study of its proton-neighbour 79Cu allows to understand the movement of a single proton around 78Ni and it is therefore a powerful tool (...)

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Le Central Neutron Detector (CND) a été installé en septembre dans le Hall-B du Jefferson Laboratory (USA).

Ce détecteur a été conçu pour aider les physiciens dans la compréhension de la structure du neutron en termes de quarks. Conçu et construit entièrement à l’IPN sur plusieurs années, il a été financé par l’IN2P3 et des fonds européens. Au cours d’une semaine de travail très intense et efficace à JLab, une équipe de l’IPN composée de cinq collègues techniciens et ingénieurs, d’un doctorant et d’une chercheuse du groupe PHEN, a mené l’installation du CND en mettant notamment en place la mécanique et (...)

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Scientific news

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Comment l’état de Hoyle décroît

Dans le cadre d’une collaboration entre l’IPNO, l’Université de Naples et l’INFN, les réactions 14N(d, alpha)12C à 10.5 MeV ont été étudiées au Tandem du LNS de Catane pour analyser la décroissance de l’état de Hoyle dans le Carbone-12. La réaction est montrée schématiquement dans la figure annexe : elle induit le transfert d’une paire neutron-proton vers le faisceau, produisant comme ça une particule alpha et un noyau de Carbone-12 excité. La particule alpha émise, observée à une énergie cinétique donnée, a (...)

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Competing Shapes in Neutron Rich Krypton Isotopes

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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, (...)

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Publications

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

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. (...)

P. Napolitani and M. Colonna

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Unexpected high-energy γ emission from decaying exotic nuclei

The N = 52 83Ga β decay was studied at ALTO. The radioactive 83Ga beam was produced through the ISOL photofission technique and collected on a movable tape for the measurement of γ -ray emission following β decay. While β-delayed neutron emission has been measured to be 56–85% of the decay path, in this experiment an unexpected high-energy 5–9 MeV γ -ray yield of 16(4)% was observed, coming from states several MeVs above the (...)

A. Gottardo, D. Verney, I. Deloncle, S. Péru, C. Delafosse, S. Roccia, I. Matea, C. Sotty, C. Andreoiu, C. Costache, M.-C. Delattre, A. Etilé, S. Franchoo, C. Gaulard, J. Guillot, F. Ibrahim, M. Lebois, M. MacCormick, N. Marginean, R. Marginean, M. Martini, C. Mihai, I. Mitu, L. Olivier, C. Portail, L. Qi, B. Roussière, L. Stan, D. Testov, J. Wilson, D.T. Yordanov

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Narrow exotic tetraquark mesons in large-N_c QCD

Discussing four-point Green functions of bilinear quark currents in large-N_c QCD, we formulate rigorous criteria for selecting diagrams appropriate for the analysis of potential tetraquark poles. We find that both flavor-exotic and cryptoexotic (i.e., flavor-nonexotic) tetraquarks, if such poles exist, have a width of order O(1/N_c^2), so they are parametrically narrower compared to the ordinary mesons, which have a width of order O(1/N_c). Moreover, for flavor-exotic states, the (...)

Hagop Sazdjian

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Delta(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI

We report on the investigation of Δ(1232) production and decay in proton-proton collisions at a kinetic energy of 1.25 GeV measured with HADES. Exclusive dilepton decay channels ppe+e− and ppe+e−γ have been studied and compared with the partial-wave analysis of the hadronic ppπ0 channel. They allow to access both Δ+→pπ0(e+e−γ) and Δ+→pe+e− Dalitz decay channels. The perfect reconstruction of the well-known π0 Dalitz decay serves as a proof of the consistency of the analysis. The Δ Dalitz decay is (...)

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Lee-Yang–inspired functional with a density-dependent neutron-neutron scattering length

Inspired by the low-density Lee-Yang expansion for the energy of a dilute Fermi gas of density ρ and momentum kF, we introduce here a Skyrme-type functional that contains only s-wave terms and provides, at the mean-field level, (i) a satisfactory equation of state for neutron matter from extremely low densities up to densities close to the equilibrium point, and (ii) a good-quality equation of state for symmetric matter at density scales around (...)

M. Grasso, D. Lacroix, and C. J. Yang

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Renormalizability of the nuclear many-body problem with the Skyrme interaction beyond mean field

Phenomenological effective interactions like Skyrme forces are currently used in mean-field calculations in nuclear physics. Mean-field models have strong analogies with the first order of the perturbative many-body problem and the currently used effective interactions are adjusted at the mean-field level. In this work, we analyze the renormalizability of the nuclear many-body problem in the case where the effective Skyrme interaction is employed in (...)

C. J. Yang, M. Grasso, K. Moghrabi, and U. van Kolck

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Power counting in peripheral partial waves: The singlet channels

We analyze the power counting of the peripheral singlet partial waves in nucleon-nucleon scattering. In agreement with conventional wisdom, we find that pion exchanges are perturbative in the peripheral singlets. We quantify from the effective field theory perspective the well-known suppression induced by the centrifugal barrier in the pion-exchange interactions. By exploring perturbation theory up to fourth order, we find that the one-pion-exchange (...)

M. Pavón Valderrama, M. Sánchez Sánchez, C.-J. Yang, Bingwei Long, J. Carbonell, and U. van Kolck

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60 ans IPN Orsay/LAL

To be noted

The 3 days-Workshop "Nucleon and Resonance Structure with Hard Exclusive Processes"

29-31 May 2017, IPN Orsay

The 3-day workshop will focus on new approaches to exploring the short-range structure of (...)

Workshop "AUGER Analysis Meeting"

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June 6-10, 2017 - IHP, Paris

During this meeting, the results of the first prototypes of the observatory (...)

R-matrix training school

September 13-15, 2017

R-matrix training school entitled "R-matrix calculations for nuclear astrophysics" will be held (...)

International Workshop on Hadron Polarimetry in the GeV region

September 18-20, 2017 - IPN Orsay, Salle des Conseils

The measurement of the polarization of hadrons in the few GeV energy range constitutes an (...)

Workshop "Bridging nuclear ab-initio and energy-density-functional theories"

October 2-6, IPN Orsay Salle A015

The goal of the workshop is firstly to bring together experts both in ab-initio methods and in (...)

Discours d’Emmanuel Macron lors de sa visite au campus Paris-Saclay

Le Président de la République, Emmanuel Macron, s’est rendu le 25 octobre dernier sur le campus (...)


Seminars

New experimental results on the 8Be anomaly

Attila J. Krasznahorkay

Institute for Nuclear Research, Hungarian Academy of Sciences, MTA Atomki, Debrecen

le 24/11/2017 à 11:00

IPN Orsay, salle des Conseils, bâtiment 100

Wave functions and EM form factors via Bethe-Salpeter-Nakanishi approach

Vladimir A. Karmanov

Lebedev Physical Institute, Moscow

le 29/11/2017 à 11:30

IPN Orsay, salle A015, bâtiment 100

Anisotropies at ultra-­high energies: an indication and a discovery

Jonathan Biteau

IPN Orsay

le 04/12/2017 à 14:00

IPN Orsay, salle des Conseils, bâtiment 100


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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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