Title: Evolution of shell structure in neutron-rich isotopes
- Morten Hjorth-Jensen, NSCL, University of Oslo
Thursday, March 15, 11:00 AM - Research Discussion
NSCL Lecture Hall
To understand why matter is stable, and thereby shed light on the limits of
nuclear stability, is one of the
overarching aims and intellectual challenges
of basic research in nuclear physics. To relate the stability of matter
to the underlying fundamental forces and particles of nature as manifested in nuclear matter, is central
to present and planned rare isotope facilities.
Important properties of nuclear systems which
can reveal information about these topics
are for example masses, and thereby binding energies,
and density distributions of nuclei.
These are quantities which convey important information on
the shell structure of nuclei, with their
pertinent magic numbers and shell closures or the eventual disappearance of the latter
away from the valley of stability.
Neutron-rich nuclei are particularly interesting for the above endeavor.
As a particular chain
of isotopes becomes more and more neutron rich, one reaches finally the limit of stability, the so-called
dripline, where one additional neutron makes the next isotopes unstable with respect
to the previous ones. The appearance or not of magic numbers and shell structures,
the formation of neutron skins and halos
can thence be probed
via investigations of quantities like the binding energy
or the charge radii and neutron rms radii of neutron-rich nuclei.
In this talk I will present some recent calculations on
properties of oxygen and calcium isotopes towards
their corresponding driplines and point to new experiments.
In particular I will focus on ground state properties
and excited states, with an
emphasis on the role
of two- and three-body forces using first principles methods
like coupled-cluster theory. I will also try to outline present and future
challenges to nuclear many-body theory and how to understand the above properties in terms of the underlying forces.