New developments using Green s function methods linking nuclear structure and reactions on the way to the drip lines

When?

Friday 20 May 2011, 13:30

Where?

30 BB 03 Physics Seminar Room

Open to:

Staff, Students

Speaker:

Willem Dickhoff, Washington University

The present understanding of proton properties near the Fermi energy for stable closed-shell nuclei has relied on data from the (e,e'p) reaction. Hadronic tools to extract such spectroscopic information have been 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 and may be used to overcome this important problem. Its efficacy is illustrated by a recent extension of the method to groups of isotopes or isotones establishing the nucleon asymmetry dependence of the DOM potentials. Based on the extracted asymmetry dependence, it is possible to predict the nucleon properties in more exotic nuclei.

Several investigations related to and extensions of the DOM are reported:

- the role of nonlocality in describing data below the Fermi energy

- properties of valence protons in exotic Sn nuclei

- insights that are provided by ab initio calculations of the nucleon self-energy emphasizing the coupling to low-lying         collective excitations

- insights into the quality of ab initio optical potentials at positive energy calculated for finite nuclei

Willem Dickhoff Presentation (5003.38KB - Requires Adobe Reader)