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Lebois M.,Institute Of Physique Nucleaire Dorsay | Bricault P.,TRIUMF Laboratory Particle and Nuclear Physics
Journal of Physics: Conference Series | Year: 2011

In the next years, TRIUMF activity will be focused on building a new facility to produce very intense neutron rich radioactive ion beams. Unlike others ISOL facilities, the e-linac primary beam, that will induce the fission, is an intense electron beam (50 MeV energy and 10 mA intensity). This challenging choice, which make this installation unique, despite the ALTO facility, makes an average fission rate of 10 13-14fissions/s in the target.This beam is sent on an uranium carbide target (UC x), but due to its power, it is essential to insert a "converter" on the beam path to avoid a target overheating. The purpose of this converter is to convert electrons into Bremsstralhung radiation. The γ rays produce excite the dipole resonance of 238 92U (15 MeV) inducing fission. Energy deposition, fission rate and thermal behavior were simulated using Monte Carlo techniques are presented in this paper.


Niccolai S.,Institute Of Physique Nucleaire Dorsay
EPJ Web of Conferences | Year: 2014

Recent promising results, obtained at Jefferson Lab, on cross sections and asymmetries for DVCS and their link to the Generalized Parton Distributions are the focus of this paper. The extensive experimental program to measure DVCS with the 12-GeV-upgraded CEBAF in three experimental Halls (A, B, C) of Jefferson Lab, will also be presented. © Owned by the authors, published by EDP Sciences, 2014.


Guidal M.,Institute Of Physique Nucleaire Dorsay
EPJ Web of Conferences | Year: 2014

We briefly review some recent developments in the field of Generalized Parton Distributions (GPDs) and Deeply virtual Compton scattering in the valence region. First steps in the direction of nucleon imaging are presented. © Owned by the authors, published by EDP Sciences, 2014.


Das I.,Institute Of Physique Nucleaire Dorsay
EPJ Web of Conferences | Year: 2014

Heavy-quark resonances, produced in high-energy heavy-ion collisions, are important observables for the study of quantum chromodynamics at extreme energy densities. In this paper, the nuclear modification factor and elliptic flow of J/ψ measured in the rapidity range (2.5 < y < 4) of ALICE have been presented for Pb-Pb collisions at √ sNN = 2.76 TeV. The recent ALICE results on the J/ψ nuclear modification factor in p-Pb collisions at √ sNN = 5.02 TeV have also been discussed. © Owned by the authors, published by EDP Sciences, 2014.


Das I.,Institute Of Physique Nucleaire Dorsay
EPJ Web of Conferences | Year: 2014

The hadroproduction of heavy quarkonium states plays a key role to understand the properties of matter created in high energy nucleus-nucleus collisions. In this paper, the nuclear modification factors for J/?,? (2S) and ? (1S) measured with ALICE at LHC energies are discussed. © Owned by the authors, published by EDP Sciences, 2014.


Niccolai S.,Institute Of Physique Nucleaire Dorsay
Nuclear Physics B - Proceedings Supplements | Year: 2011

The experimental program to study nucleon structure at the 12-GeV upgraded JLab using the CLAS12 detector is presented here. The focus of this paper is on deeply virtual exclusive processes, giving access to the Generalized Parton Distributions, and semi-inclusive processes that allow extraction of Transverse Momentum Dependent distribution functions. With its wide acceptance, high luminosity, good resolution and particle identification capabilities, large Q2 and xB coverage (1


Guidal M.,Institute Of Physique Nucleaire Dorsay
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2010

We have analyzed the beam spin asymmetry and the longitudinally polarized target spin asymmetry of the Deep Virtual Compton Scattering process, recently measured by the Jefferson Lab CLAS collaboration. Our aim is to extract information about the Generalized Parton Distributions of the proton. By fitting these data, in a largely model-independent procedure, we are able to extract numerical values for the two Compton Form Factors H Im and over(H, ̃) Im with uncertainties, in average, of the order of 30%. © 2010 Elsevier B.V. All rights reserved.


Niccolai S.,Institute Of Physique Nucleaire Dorsay
Progress in Particle and Nuclear Physics | Year: 2012

Recent promising results obtained with the Jefferson Lab CLAS detector on deeply virtual exclusive processes and their link to the generalized parton distributions, along with the experimental program for studying GPDs at the 12 GeV upgraded JLab using the CLAS12 detector, are discussed here. With its wide acceptance, high luminosity, good resolution and particle identification capabilities, as well as large Q 2 and x B coverage (1GeV< Q 2<10GeV 2, 0.1< x B<0.8), CLAS12 will be the ideal facility to pursue the research on the three-dimensional structure of the nucleon in the valence region. © 2012 Elsevier B.V. All rights reserved.


Jo H.-S.,Institute Of Physique Nucleaire Dorsay
AIP Conference Proceedings | Year: 2013

Generalized parton distributions (GPDs) are nowadays the object of an intense effort of research. Among other aspects, they allow to unravel the correlation between the longitudinal momentum fraction and the transverse spatial distributions of quarks and gluons inside the nucleon, with the prospect of accessing the angular momentum contribution of the partons to the nucleon's spin. The CLAS collaboration at JLab plays a key role in the extraction of GPDs from deep exclusive processes, in particular from deeply virtual Compton scattering (DVCS). This topic is at the heart of the physics program for the upcoming JLab machine upgrade to 12 GeV. In this report, we present the future CLAS12 detector and the simulations that have been carried out for the DVCS process. We show how the various combinations of beam and target polarization observables will constrain the GPDs or Compton Form Factors extractions. © 2013 AIP Publishing LLC.


Niccolai S.,Institute Of Physique Nucleaire Dorsay
International Journal of Modern Physics A | Year: 2015

Generalized Parton Distributions (GPDs) are nowadays the object of an intense effort of research, in the perspective of understanding nucleon structure. They describe the correlations between the longitudinal momentum and the transverse spatial position of the partons inside the nucleon and they can give access to the contribution of the orbital momentum of the quarks to the nucleon spin. Deeply Virtual Compton scattering (DVCS), the electroproduction on the nucleon, at the quark level, of a real photon, is the process more directly interpretable in terms of GPDs of the nucleon. Depending on the target nucleon (proton or neutron) and on the DVCS observable extracted (cross-sections, target- or beam-spin asymmetries, etc.), different sensitivity to the various GPDs for each quark flavor can be exploited. This article is focused on recent promising results, obtained at Jefferson Lab, on cross-sections and asymmetries for DVCS, and their link to GPDs. These data open the way to a "tomographic" representation of the structure of the nucleon, allowing the extraction of transverse-space densities of the quarks at fixed longitudinal momentum. The extensive experimental program to measure GPDs at Jefferson Lab with the 12 GeV-upgraded electron accelerator and the complementary detectors that will be housed in three experimental Halls (A, B and C), will also be presented. © 2015 World Scientific Publishing Company.

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