Tel Aviv University


Tel Aviv University
Physics Colloquium

Academic Year  2009 - 2010


The colloquium is held at Melamed Hall (Room 6) in the Shenkar Physics Building, every Sunday at 16:10. Light refreshments are served outside Melamed Hall at 15:50. 

 

December 27, 2009

"Nucleon Form Factors and their Modification in the Nuclear Medium"

Dr. Guy Ron
Nuclear Science Division, Lawrence Berkeley National Lab


  Electromagnetic form factors of the nucleon are model-independent observables which encode our ignorance of its complex internal structure. In recent years significant attention has been drawn to these observables due to the discovery of unexplained deviations from previously measured results.

Recoil polarization measurements and high precision cross section measurements are allowing the electric to magnetic form factors ratios be determined with unprecedented precision. New results from MIT-BLAST and, more recently, from Hall A at Jefferson Lab indicate that there is an unexpected decrease in the proton form factor ratio at low Q2. Even newer data is expected to come from MAINZ and JLab experiments in the near future.

Nucleon modifications in the nuclear matter have been suggested as possible explanation of different phenomena, such as the EMC effect and quenching of the Coulomb sum rule. Unambiguous evidence of these modifications has yet to be found. A sensitive probe for such modification is the ratio of the electric to magnetic nucleon form factors.

This talk will address the measurement, and interpretation, of the nucleon form factors, present new results of the proton form factors as a probe of the proton peripheral structure, and discuss the probing of the nucleon modification in the medium using measurements of the EM form factors.  

Host: Prof. Nissan Itzhaki, x6490
 
Fall 2009 Schedule

For more information or for directions to Melamed Hall please contact:
Chava Balson  03-6408636

To suggest potential speakers or register feedback contact: Ron Lifshitz  03-6405145, Ehud Nakar  03-6405385, or Nissan Itzhaki  03-6406490.


Sponsored by:   The Raymond and Beverly Sackler School of Physics & Astronomy, The Faculty of Exact Sciences, Tel Aviv University.