[Jlab-seminars] Physics Seminar

[Luci Collins]

*Physics Seminar
Fri. June 14th
11:00AM
CEBAF Center AUD.**
Coffee & Cookies 10:45AM

**Willem Dickhoff
Washington Univ.

"INTERSECTION OF SOFT (LONG-RANGE) AND HARD (SHORT-RANGE) PROCESSES IN 
NUCLEI" *

The present understanding of the role of short- and long-range physics 
in determining proton properties near the Fermi energy for stable 
closed-shell nuclei has relied on data from the (e,e'p) reaction but is 
also supported by other experimental observations. Hadronic tools to 
extract such spectroscopic information are hampered by the lack of a 
consistent reaction description that provides unambiguous and undisputed 
results. The dispersive optical model (DOM), originally conceived by 
Claude Mahaux, provides a unified description of both elastic nucleon 
scattering and structure information related to single-particle 
properties below the Fermi energy. The DOM provides a framework in which 
nuclear reactions and structure data can be analyzed consistently to 
provide unambiguous spectroscopic information including its nucleon 
asymmetry dependence. An extension of the method to describe nuclear 
charge densities requires the introduction of non-local absorptive 
potentials which sheds new light on the treatment of nucleon distorted 
waves. The properties on ab initio non-local potentials provide further 
insight. The current DOM implementation can adequately describe the 
high-momentum spectral function extracted from JLab experiments. The 
implication for the importance of three-body nuclear forces is clarified.
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