Quenching of Spectroscopic Factors: Short- and long-range correlations effects in a phenomenological model.
Abstract
The independent-particle model of the nucleus has provided a solid framework to explain many nuclear properties. Residual interactions between nucleons, both short- and long-range, modify the mean-field approximation and the pure independent-particle picture in the form of quasi-particles. Notably, these correlations are thought to be the reason for the quenching of spectroscopic factors observed in (e,e'p), (p,2p) and transfer reactions. Inspired by the results of Ref., we proposed a phenomenological model to examine the role of short- and long-range correlations and their evolution in asymmetric systems. Our approach correlates the observed increase of the high-momentum component of the proton momentum density in a neutron-rich nucleus with the reduced proton occupancies for states below or near the Fermi level as a function of (N-Z)/A. In this contribution we extend the model to capture effects of weak binding that may play a role in reactions with exotic beams. Furthermore, we discuss the implications of our SRC results on the symmetry energy and potential changes in charge radii.
UK STFC ST/M006433/1 and the Royal Society under contract UF150476, and the U.S. Dept of Energy DE-AC02-05CH11231.- Publication:
-
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..DNP.KE007P