Joint Seminar in Nuclear Physics

Hayk Hakobyan, Universidad Federico Santa Maria, Valparaiso, Chile

Shalom Shlomo, Cyclotron Institute, Texas A&M University, Texas, USA

29 December 2014, 14:45 
Schreiber Building, Room 006 
Joint Seminar in Nuclear Physics



14:45 - 15:00  



15:00 - 16:00  

"Medium hadronization studies with CLAS/CLAS12 and more"

Hayk Hakobyan, Universidad Federico Santa Maria, Valparaiso, Chile



I will give a brief introduction to different experimental physics activities carried out at Centro Científico Tecnológico de Valparaiso (CCTVAL) at the Universidad Técnica Federico Santa María, Valparaiso Chile which includes collaborative research activities carried out in different international labs as well as detector and detector component design and fabrication. 


After that, I will go to the main subject of the presentation and will talk about the medium induced hadronization studies with the CLAS/CLAS12 detector at Jefferson Lab, Newport News, VA. Atomic nuclei can be used as spatial analyzers of the hadronization process in semi-inclusive deep inelastic scattering. The results of analysis for the Eg2 experimental data where electrons and positive pions were measured from a 5 GeV electron beam incident on targets of liquid deuterium, C, Fe, and Pb using CLAS in Hall B will be described. The broadening of the transverse momentum and the hadronic multiplicity ratio of positive pions has been studied in detail as a function of multiple kinematic variables. Some interpretation in terms ofthe transport of the struck quark through the nuclear systems will be discussed as well. At the end I will mention some future experiments with polarized targets.


16:00 - 16:30  

Coffee break


16:30 - 17:30  

"Sensitivities of energies of giant resonances to properties of the energy density functional"

Shalom Shlomo, Cyclotron Institute, Texas A&M University, Texas, USA



We will first describe a method for determining a modern energy density functional (EDF), based on the effective nucleon-nucleon Skyrme type interaction, with an enhanced predictive power for properties of nuclei and the equation of state (EOS) of nuclear matter (NM), the needed ingredient in the study of nuclei and the structure and evolution of compact astrophysical objects. The parameters and some properties of the new and improved EDF (named KDE0 and KDE0v1) will be presented.


Next the results of HF-based RPA calculations of properties of neutron-rich nuclei and of multipole isoscalar and isovector giant resonances (strength distribution and centroid energies) will be presented and their sensitivity to NM properties, such as the incompressibility coefficient, the symmetry energy density and the effective mass, that are needed to determine the next generation EDF, will be discussed.


For more details, please consult the joint seminar home page.


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