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La spectroscopie laser des éléments les plus lourds dans un jet supersonique : l’IPN d’Orsay participe à une nouvelle technique expérimentale testée avec succès à IKS (Louvain)*

L’ionisation laser résonnante, c’est-à-dire la technique qui consiste à ioniser un atome par faisceau laser, ainsi que la spectroscopie laser, qui permet de déterminer la structure hyperfine des atomes, sont des techniques largement utilisées sur les installations qui produisent des faisceaux d’ions radioactifs. Ces méthodes permettent de produire des noyaux exotiques tout en mesurant leurs forme, taille et spin ainsi que les moments multipolaires électromagnétiques. Cependant, il reste difficile (...)

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IGLEX: end of construction site

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The IGLEX was decided between the two laboratories, IPNO and LAL, within the framework of the valley plan in 2012. The aim was to create a multidisciplinary centre with the two EQUIPEX ANDROMEDE and THOMX teams carried by these two laboratories. This centre is located in building 209 (named (...)

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Scientific news

Microscopic Phase-Space Exploration Modeling of 258Fm Spontaneous Fission

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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 (...)

Y. Tanimura, D. Lacroix and S. Ayik

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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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Pygmy Gamow-Teller resonance in the N=50 region: New evidence from staggering of β-delayed neutron-emission probabilities

Abstract We report on the β-delayed neutron emission probability (P1n) measurements of the 82,83,84Ga (N=51,52,53) precursors performed in one single experiment using the 3He neutron-counter TETRA at the ALTO facility in Orsay. Altogether our results for the three A=82,83, and 84 Ga precursors point towards a sizable P1n staggering in the N=50 region, similar to the one already observed just after the N=28 shell closure in the K isotopes chain, hinting at a similar mechanism. We will (...)

D. Verney, D. Testov, F. Ibrahim, B. Roussière, S. Franchoo, R. Li, I. Matea, I. Stefan, and D. Suzuki

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96Kr–Low-Z Boundary of the Island of Deformation at N=60

Abstract Prompt γ-ray spectroscopy of the neutron-rich 96Kr, produced in transfer- and fusion-induced fission reactions, has been performed using the combination of the Advanced Gamma Tracking Array and the VAMOS++ spectrometer. A second excited state, assigned to Jπ=4+, is observed for the first time, and a previously reported level energy of the first 2+ excited state is confirmed. The measured energy ratio R4/2=E(4+)/E(2+)=2.12(1) indicates that this nucleus does not show a (...)

C. Delafosse, A. Gottardo, D. Verney

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Ultrafast-timing lifetime measurements in 94Ru and 96Pd: Breakdown of the seniority scheme in N=50 isotones

Abstract The advanced time-delayed γγ(t) method has been applied to determine half-lives of low-lying states in the N=50 isotones 94Ru and 96Pd. The inferred experimental E2 strengths for the 4+→2+ transitions in the two nuclei show a dramatic deviation with respect to the shell model predictions in the (f5/2,p,g9/2) proton hole space in 100Sn. The anomalous behavior can be ascribed to a breakdown of the seniority quantum number in the πgn9/2 configuration due to particle-hole excitations (...)

I. Matea, D. Verney

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Time-dependent mean-field determination of the excitation energy in transfer reactions: Application to the reaction 238U on 12C at 6.14 MeV/nucleon

Abstract : The internal excitation of nuclei after multinucleon transfer is estimated by using the time-dependent mean-field theory. Transfer probabilities for each channel as well as the energy loss after reseparation are calculated. By combining these two pieces of information, we show that the excitation energy distribution of the transfer fragments can be obtained separately for the different transfer channels. The method is applied to the (...)

G. Scamps, C. Rodríguez-Tajes, D. Lacroix, and F. Farget

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Non-Markovian dynamics of fully coupled fermionic and bosonic oscillators

Abstract : The non-Markovian Langevin approach is applied to study the dynamics of fermionic (bosonic) oscillator linearly coupled to a fermionic (bosonic) environment. The analytical expressions for occupation numbers in two different types of couplings (rotating-wave approximation and fully coupled) are compared and discussed. The weak-coupling and high- and low-temperature limits are considered as well. The conditions under which the environment (...)

V. V. Sargsyan, D. Lacroix, G. G. Adamian, and N. V. Antonenko

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Spectroscopy of 61Fe via the neutron transfer reaction 2H(60Fe,p)61Fe*

Abstract : The direct component of the 60Fe(n,γ)61Fe cross section was investigated by populating the bound states of the 61Fe nucleus through the (d,pγ) transfer reaction in inverse kinematics using a radioactive beam of 60Fe at 27A MeV. The experiment was performed at GANIL using the MUST2 array and an annular double-sided silicon strip detector for the detection of the light charged particle in coincidence with the photons measured in (...)

S. Giron, F. Hammache, N. de Séréville, P. Roussel, J. Burgender, M. Moukaddam et al.

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Time-of-flight secondary ion mass spectrometry imaging of biological samples with delayed extraction for high mass and high spatial resolutions

Abstract Rationale In Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS), pulsed and focused primary ion beams enable mass spectrometry imaging, a method which is particularly useful to map various small molecules such as lipids at the surface of biological samples. When using TOF-SIMS instruments, the focusing modes of the primary ion beam delivered by liquid metal ion guns can provide either a mass resolution of several thousand or a sub-µm lateral resolution, but the (...)

Quentin P. Vanbellingen, Nicolas Elie, Michael J. Eller, Serge Della-Negra, David Touboul, Alain Brunelle

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60 ans IPN Orsay/LAL

To be noted


The DAMIC experiment: searching for WIMPs and beyond with CCDs

Paolo Privitera

The Enrico Fermi Institute/The Kavli Institute for Cosmological Physics, Univ.of Chicago

le 31/05/2017 à 11:00

IPN Orsay, salle des Conseils, bâtiment 100

Scale Invariance in Heavy Hadron Molecules

Manuel Pavon Valderrama

Beihang University, Beijing

le 01/06/2017 à 11:00

IPN Orsay, salle A201, bâtiment 100

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

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