CNRS Laboratory of Subatomic Physics and Associated Technologies

Nantes, France

CNRS Laboratory of Subatomic Physics and Associated Technologies

Nantes, France
SEARCH FILTERS
Time filter
Source Type

Hartnack C.,CNRS Laboratory of Subatomic Physics and Associated Technologies | Oeschler H.,TU Darmstadt | Leifels Y.,Helmholtz Center for Heavy Ion Research | Bratkovskaya E.L.,Frankfurt University | Aichelin J.,CNRS Laboratory of Subatomic Physics and Associated Technologies
Physics Reports | Year: 2012

We discuss strangeness production close to the threshold in p+A and A+A collision. Comparing the body of available K+, K 0, K-, and Λ data with the IQMD transport code and for some key observables as well with the HSD transport code, we find good agreement for the large majority of the observables. The investigation of the reaction with the help of these codes reveals the complicated interaction of the strange particles with hadronic matter which makes strangeness production in heavy-ion collisions very different from that in elementary interactions. We show how different strange particle observables can be used to study the different facets of this interaction (production, rescattering and potential interaction) which finally merge into a comprehensive understanding of these interactions. We identify those observables which allow for studying (almost) exclusively one of these processes to show how the future high precision experiments can improve our quantitative understanding. Finally, we discuss how the K+ multiplicity can be used to study the hadronic equation of state. © 2011 Elsevier B.V.


Morreale A.,CNRS Laboratory of Subatomic Physics and Associated Technologies
Nuclear Physics A | Year: 2016

One of the key signatures of the Quark-Gluon Plasma (QGP), is the modification of hadron transverse momentum differential cross-sections in heavy-ion collisions (HIC) as compared to proton-proton (pp) collisions. Suppression of hadron production at high transverse momenta (pT) in HIC has been explained by the energy loss of the partons produced in the hard scattering processes which traverse the deconfined quantum chromodynamic (QCD) matter. The dependence of the observed suppression on the pT of the measured hadron towards higher pT is an important input for the theoretical understanding of jet quenching effects in the QGP and the nature of the energy loss. The ALICE experiment at the Large Hadron Collider (LHC) performs measurements of neutral meson inclusive spectra at mid-rapidity in a wide pT range in pp, p-Pb and Pb-Pb collisions. Neutral mesons (π0,η,ω) are reconstructed via complementary methods, using the ALICE electromagnetic calorimeters, PHOS and EMCal, and by the central tracking system, identifying photons converted into e+e− pairs in the material of the inner barrel detectors (TPC and ITS). © 2016 Elsevier B.V.


Arleo F.,University of Savoy | Arleo F.,CERN | Peigne S.,CNRS Laboratory of Subatomic Physics and Associated Technologies
Physical Review Letters | Year: 2012

The effects of energy loss in cold nuclear matter on J/ψ suppression in p-A collisions are studied. A simple model based on first principles and depending on a single free parameter is able to reproduce J/ψ suppression data at large x F and at various center-of-mass energies. These results strongly support energy loss as a dominant effect in quarkonium suppression. They also give some hint on its hadroproduction mechanism suggesting color neutralization to happen on long time scales. Predictions for J/ψ and Υ suppression in p-Pb collisions at the LHC are made. © 2012 American Physical Society.


Arleo F.,French National Center for Scientific Research | Peigne S.,CNRS Laboratory of Subatomic Physics and Associated Technologies
Journal of High Energy Physics | Year: 2013

The effects of parton energy loss in cold nuclear matter on heavy-quarkonium suppression in p-A collisions are studied. It is shown from first principles that at large quarkonium energy E and small production angle in the nucleus rest frame, the medium-induced energy loss scales as E. Using this result, a phenomenological model depending on a single free parameter is able to reproduce J/ψ and Υ suppression data in a broad x F -range and at various center-of-mass energies. These results strongly support energy loss as the dominant effect in heavy-quarkonium suppression in p-A collisions. Predictions for J/ψ and Υ suppression in p-Pb collisions at the LHC are made. It is argued that parton energy loss scaling as E should generally apply to hadron production in p-A collisions, such as light hadron or open charm production. © 2013 SISSA.


Cutler C.S.,University of Missouri | Hennkens H.M.,University of Missouri | Sisay N.,University of Missouri | Huclier-Markai S.,CNRS Laboratory of Subatomic Physics and Associated Technologies | Jurisson S.S.,University of Missouri
Chemical Reviews | Year: 2013

A study was conducted to demonstrate the use of radiometals for combined imaging and therapy. The study presented radiometals that had the nuclear properties required for use in theranostic applications for imaging and therapy. Their chemistry and production methods were discussed, along with examples of preclinical and clinical uses. A number of radiometals had been evaluated for positron emission tomography (PET) due to their favorable nuclear properties. The choice of type and energy of the particle emission was determined by the size of the lesion or tumor being treated, site of delivery, whether the tumor was homogeneous, and whether the dose was delivered uniformly to each cell. A major advantage of using such nanosized radioactive particles was their potential to contain numerous radioactive atoms within a single nanoparticle.


Gossiaux P.B.,CNRS Laboratory of Subatomic Physics and Associated Technologies
Nuclear Physics A | Year: 2013

We present a model for radiative energy loss of heavy quarks in quark gluon plasma which incorporates coherence effects. We then study its consequences on the radiation spectra as well as on the nuclear modification factor of open heavy mesons produced in ultrarelativistic heavy ion collisions. © 2013 Elsevier B.V.


Sood A.D.,CNRS Laboratory of Subatomic Physics and Associated Technologies
Physical Review C - Nuclear Physics | Year: 2011

We study the N/Z and N/A dependence of balance energy (Ebal) for isotopic series of Ca having N/Z (N/A) varying from 1.0 to 2.0 (0.5 to 0.67). We show that the N/Z (N/A) dependence of Ebal is sensitive to symmetry energy and its density dependence at densities higher than saturation density and is insensitive toward the isospin dependence of nucleon-nucleon (nn) cross section and Coulomb repulsion. We also study the effect of momentum-dependent interactions (MDI) on the N/Z (N/A) dependence of E bal. We find that although MDI influences the Ebal drastically, the N/Z (N/A) dependence of Ebal remains unchanged on inclusion of MDI. ©2011 American Physical Society.


Grambow B.,CNRS Laboratory of Subatomic Physics and Associated Technologies
Elements | Year: 2016

Keeping future generations safe from today's nuclear waste relies on this waste being effectively isolated for all time. Clay rocks, or rocks with a high clay content, offer promising isolation properties over time periods that are as long as the age of their host geological formations. Constructing a repository in such material does not significantly change the clay's isolation properties, which is a great advantage. Isolation is a function of the interplay between the slow release of radionuclides from the waste, the diffusion-controlled radionuclide migration, the establishment of a reducing geochemical environment, and the weak solubility and strong retention of the most toxic radionuclides on clay minerals and on additional engineered barrier materials. © 2016 by the Mineralogical Society of America.


Gautam S.,Panjab University | Sood A.D.,CNRS Laboratory of Subatomic Physics and Associated Technologies
Physical Review C - Nuclear Physics | Year: 2010

We study the effect of isospin degree of freedom on balance energy throughout the mass range between 50 and 350 for two sets of isotopic systems with N/A= 0.54 and 0.57 as well as isobaric systems with N/A= 0.5 and 0.58. Our findings indicate that different values of balance energy for two isobaric systems may be mainly due to the Coulomb repulsion. We also demonstrate clearly the dominance of Coulomb repulsion over symmetry energy. © 2010 The American Physical Society.


Manuel C.,Autonomous University of Barcelona | Torres-Rincon J.M.,CNRS Laboratory of Subatomic Physics and Associated Technologies
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

We derive the relativistic chiral transport equation for massless fermions and antifermions by performing a semiclassical Foldy-Wouthuysen diagonalization of the quantum Dirac Hamiltonian. The Berry connection naturally emerges in the diagonalization process to modify the classical equations of motion of a fermion in an electromagnetic field. We also see that the fermion and antifermion dispersion relations are corrected at first order in the Planck constant by the Berry curvature, as previously derived by Son and Yamamoto for the particular case of vanishing temperature. Our approach does not require knowledge of the state of the system, and thus it can also be applied at high temperature. We provide support for our result by an alternative computation using an effective field theory for fermions and antifermions: the on-shell effective field theory. In this formalism, the off-shell fermionic modes are integrated out to generate an effective Lagrangian for the quasi-on-shell fermions/antifermions. The dispersion relation at leading order exactly matches the result from the semiclassical diagonalization. From the transport equation, we explicitly show how the axial and gauge anomalies are not modified at finite temperature and density despite the incorporation of the new dispersion relation into the distribution function. © 2014 American Physical Society.

Loading CNRS Laboratory of Subatomic Physics and Associated Technologies collaborators
Loading CNRS Laboratory of Subatomic Physics and Associated Technologies collaborators