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Accueil > Recherche & Enseignement

M. Grégory Lehaut

Chercheur CNRS

Groupe : Aval du Cycle électronucléaire

lehaut lpccaen.in2p3.fr

Tel : +33 2 31 45 29 85




PUBLICATIONS

[in2p3-01274914] Monte Carlo MSM correction factors for control rod worth estimates in subcritical and near-critical fast neutron reactors

16 février 2016

The GUINEVERE project was launched in 2006, within the 6th Euratom Framework Program IP-EUROTRANS, in order to study the feasibility of transmutation in Accelerator Driven subcritical Systems (ADS). This zero-power facility hosted at the SCK·CEN site in Mol (Belgium) couples the fast subcritical (...)

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[in2p3-01235346] Monte Carlo MSM correction factors for control rod worth estimates in subcritical and near-critical fast neutron reactors

3 décembre 2015

The GUINEVERE project was launched in 2006, within the 6th Euratom Framework Program IP-EUROTRANS, in order to study the feasibility of transmutation in Accelerator Driven subcritical Systems (ADS). This zero-power facility hosted at the SCK·CEN site in Mol (Belgium) couples the fast subcritical (...)

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[in2p3-01177675] Estimate of the reactivity of the VENUS-F subcritical configuration using a Monte Carlo MSM method

20 juillet 2015

The GUINEVERE project was launched in 2006 in order to study the feasibility of transmutation in Accelerator Driven subcritical Systems (ADS). This facility, hosted at the Belgian Nuclear Research Center SCK·CEN, couples the fast subcritical lead reactor VENUS-F with an external neutron source (...)

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[in2p3-01170130] Scintillation properties of N2 and CF4 and performances of a scintillating ionization chamber

18 juillet 2015

In this work, we studied the emission yields, decay times and coincidence resolving times (CRT) of two gases, nitrogen (N2) and tetrafluoromethane (CF4), used for particle detection in the context of fission products measurement. The setup was made of an ionization chamber and two (...)

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[in2p3-01066044] In-medium effects for nuclear matter in the Fermi energy domain

3 juillet 2015

We study nuclear stopping in central collisions for heavy-ion induced reactions in the Fermi energy domain, between $15$ and $100$ A\,\textrmMeV. Using the large dataset of exclusive measurements provided by the $4\pi$ array \emphINDRA, we determine the relative degree of stopping as a function (...)

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Isospin effects and symmetry energy studies with INDRA

27 mars 2014

The equation of state of asymmetric nuclear matter is still controversial, as predictions at subsaturation as well as above normal density widely diverge. We discuss several experimental results measured in heavy-ion collisions with the INDRA array in the incident energy range 5-80AMeV. In (...)

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FALSTAFF: A new tool for fission studies

16 décembre 2013

The future NFS installation will produce high intensity neutron beams from hundreds of keV up to 40MeV. Taking advantage of this facility, data of particular interest for the nuclear community in view of the development of the fast reactor technology will be measured. The development of an (...)

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[in2p3-00875063] Isospin effects and symmetry energy studies with INDRA

21 octobre 2013

The equation of state of asymmetric nuclear matter is still controversial, as predictions at subsaturation as well as above normal density widely diverge. We discuss several experimental results measured in heavy-ion collisions with the INDRA array in the incident energy range 5-80 MeV/nucleon. (...)

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Spectroscopy of 135La

8 octobre 2013

The 135La nucleus has been studied using the fusion-evaporation reaction 124Sn(17N,6n) induced by the 17N radioactive beam. The level scheme has been constructed from the γ-γ coincidence measurement with an array of 12 HPGe detectors, and the lifetimes of two previously known isomeric states has (...)

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Nuclear stopping for heavy-ion induced reactions in the Fermi Energy range : from 1-Body to 2-Body dissipation

5 septembre 2013

We address the stopping in heavy-ion induced reactions around the Fermi energy using central collisions recorded with \emphINDRA $4\pi$ array. The stopping is minimal around the Fermi energy and corresponds to the disappearance of the Mean-Field effects and the appearance of nucleon-nucleon (...)

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Reactivity monitoring using the area method for the subcritical VENUS-F core within the framework of the FREYA Project

3 juin 2013

Accelerator-Driven Systems (ADS) could be employed to incinerate minor actinides and so partly contribute to answer the problem of nuclear waste management. An ADS consists of the coupling of a subcritical fast reactor to a particle accelerator via a heavy material spallation target. The (...)

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Towards the Determination of Superdeformation in 42Ca

22 mai 2013

The Coulomb excitation experiment to study electromagnetic structure of low-lying states in Ca-42 with a focus on a possible superdeformation in this nucleus was performed at the Laboratori Nazionali di Legnaro in Italy. Preliminary values of the determined quadrupole deformation parameters for (...)

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Fission Fragment characterization with FALSTAFF at NFS

30 avril 2013

The Neutrons for Science (NFS) facility will be one of the first installations of the SPIRAL2 facility. NFS will be composed of a time-of-flight baseline and irradiation stations and will allow studying neutron-induced reactions for energies going from some hundreds of keV up to 40 MeV. (...)

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FALSTAFF : a New Tool for Fission Fragment Characterization

8 mars 2013

The Neutrons for Science (NFS) facility will be one of the SPIRAL2 installations. The NFS time-offlight hall will allow studying neutron-induced reactions for energies going from some hundreds of kev up to 40 MeV. Taking advantage of this new installation, the development of an experimental (...)

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Discovery of a new isomeric state in $^{68}$Ni: Evidence for a highly-deformed proton intruder state.

27 février 2012

We report on the observation of a new isomeric state in $^68$Ni. We suggest that the newly observed state at 168(1) keV above the first 2$^+$ state is a $\pi(2p-2h)$ 0$^+$ state across the major Z=28 shell gap. Comparison with theoretical calculations indicates a pure proton intruder (...)

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Recent results from INDRA

27 octobre 2011

We present an overview of recent results & advances within the INDRA collaboration

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Refinement of the 42Ca Level Scheme. Preliminary Results from the First AGATA Demonstrator Experiment

21 avril 2011

The Coulomb excitation experiment to study electromagnetic properties of low-lying states in 42Ca with a focus on a presumably superdeformed band was performed at the Laboratori Nazionali di Legnaro in Italy using the \gamma -ray spectrometer AGATA Demonstrator coupled to the DANTE charged (...)

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Refinement of the 42Ca Level Scheme. Preliminary Results from the First AGATA Demonstrator Experiment

21 avril 2011

The Coulomb excitation experiment to study electromagnetic properties of low-lying states in 42Ca with a focus on a presumably superdeformed band was performed at the Laboratori Nazionali di Legnaro in Italy using the \gamma -ray spectrometer AGATA Demonstrator coupled to the DANTE charged (...)

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Spectroscopic information about a hypothetical tetrahedral configuration in 156Gd

22 février 2011

A detailed γ -ray spectroscopy of the lowest two negative-parity bands in 156Gd has been performed in the framework of the TetraNuc collaboration. Relative γ -ray intensities of all transitions connecting these bands as well as the ones to the ground-state band are presented. Angular distribution (...)

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Spectroscopic information about a hypothetical tetrahedral configuration in 156Gd

22 février 2011

A detailed γ -ray spectroscopy of the lowest two negative-parity bands in 156Gd has been performed in the framework of the TetraNuc collaboration. Relative γ -ray intensities of all transitions connecting these bands as well as the ones to the ground-state band are presented. Angular distribution (...)

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Study of Nuclear Stopping in Central Collisions at Intermediate Energies

22 juin 2010

Nuclear stopping has been investigated in central nuclear collisions at intermediate energies by analyzing kinematically complete events recorded with the help of the 4π multidetector INDRA for a large variety of symmetric systems. It is found that the mean isotropy ratio defined as the ratio of (...)

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[in2p3-00494230] Study of Nuclear Stopping in Central Collisions at Intermediate Energies

22 juin 2010

Nuclear stopping has been investigated in central nuclear collisions at intermediate energies by analyzing kinematically complete events recorded with the help of the 4π multidetector INDRA for a large variety of symmetric systems. It is found that the mean isotropy ratio defined as the ratio of (...)

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Phase diagram of the charged lattice-gas model with two types of particles

17 juin 2010

A lattice-gas model with two types of particles, a particle-dependent short-range coupling and a long-range repulsive Coulombic interaction, is introduced. The phase diagram of an isolated finite system of 129 particles is constructed using the bimodality properties of the observables' (...)

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[in2p3-00492917] Phase diagram of the charged lattice-gas model with two types of particles

17 juin 2010

A lattice-gas model with two types of particles, a particle-dependent short-range coupling and a long-range repulsive Coulombic interaction, is introduced. The phase diagram of an isolated finite system of 129 particles is constructed using the bimodality properties of the observables' (...)

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A study of stopping power in nuclear reactions at intermediate energies

10 mars 2010

We show a systematic experimental study based on INDRA data of the stopping power in central symmetric nuclear reactions. Total mass of the systems goes from 80 to 400 nucleons while the incident energy range is from 12 AMeV to 100 AMeV. The role of isospin diffusion at 32 and 45 MeV/nucleon (...)

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A study of stopping power in nuclear reactions at intermediate energies

10 mars 2010

We show a systematic experimental study based on INDRA data of the stopping power in central symmetric nuclear reactions. Total mass of the systems goes from 80 to 400 nucleons while the incident energy range is from 12 AMeV to 100 AMeV. The role of isospin diffusion at 32 and 45 MeV/nucleon (...)

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From fission to multifragmentation and back

21 janvier 2010

Multifragmentation, defined as the decay of a highly excited nuclear source into more than two fragments, is generally considered in the nuclear physics community as a completely different phenomenon than nuclear fission, and tentatively interpreted as the finite system counterpart of the (...)

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From fission to multifragmentation and back

21 janvier 2010

Multifragmentation, defined as the decay of a highly excited nuclear source into more than two fragments, is generally considered in the nuclear physics community as a completely different phenomenon than nuclear fission, and tentatively interpreted as the finite system counterpart of the (...)

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Isoscaling as a Measure of Symmetry Energy in the Lattice Gas Model

27 novembre 2009

The energetic properties of nuclear clusters inside a low-density, finite-temperature medium are studied with a lattice gas model including isospin dependence and Coulomb forces. Important deviations are observed with respect to the Fisher approximation of an ideal gas of noninteracting (...)

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[in2p3-00378550] Isoscaling as a Measure of Symmetry Energy in the Lattice Gas Model

27 novembre 2009

The energetic properties of nuclear clusters inside a low-density, finite-temperature medium are studied with a lattice gas model including isospin dependence and Coulomb forces. Important deviations are observed with respect to the Fisher approximation of an ideal gas of noninteracting (...)

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Liens entre les propriétés statistiques et dynamiques des fragments produits lors des collisions d'ions lourds autour de l'énergie de Fermi.

28 octobre 2009

Les propriétés des fragments produits lors des collisions d'ions lourds autour de l'énergie de Fermi ont été étudiées à travers le degré de liberté d'isospin. La première partie de cette étude est basée sur une approche de gaz sur réseau, où le système est consti- tué de deux types de particules (neutron, (...)

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Liens entre les propriétés statistiques et dynamiques des fragments produits lors des collisions d'ions lourds autour de l'énergie de Fermi.

28 octobre 2009

Les propriétés des fragments produits lors des collisions d'ions lourds autour de l'énergie de Fermi ont été étudiées à travers le degré de liberté d'isospin. La première partie de cette étude est basée sur une approche de gaz sur réseau, où le système est consti- tué de deux types de particules (neutron, (...)

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Freeze-out properties of multifragmentation events

30 juin 2008

Freeze-out properties of multifragmentation events produced in central 129Xe+natSn collisions at different beam energies (32, 39, 45 and 50 AMeV) were estimated by means of a simulation based on the experimental data collected by the 4π INDRA multidetector. A rapid increase (between 32 and 45 (...)

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[in2p3-00291789] Freeze-out properties of multifragmentation events

30 juin 2008

Freeze-out properties of multifragmentation events produced in central 129Xe+natSn collisions at different beam energies (32, 39, 45 and 50 AMeV) were estimated by means of a simulation based on the experimental data collected by the 4π INDRA multidetector. A rapid increase (between 32 and 45 (...)

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