Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Struktur und Dynamik von Kernen

HK 25.7: Talk

Tuesday, March 18, 2014, 18:30–18:45, HZ 5

Ab Initio Study of Neutron Drops with Chiral NN+3N Interactions — •Sebastian Fischer, Robert Roth, Angelo Calci, and Joachim Langhammer — Institut für Kernphysik, Technische Universität Darmstadt

Neutron drops provide a simple test system of neutron-rich matter. Hence, ab initio calculations of these pure neutron systems may be used to constrain the large isospin properties of energy-density functionals and equations of state that are used for the description of very neutron-rich systems as they occur in astrophysical environments, e.g., neutron stars.

For the first time, we calculate properties of neutron drops interacting via realistic two- and three-nucleon forces derived from chiral effective field theory using the ab initio importance-truncated no-core shell model (IT-NCSM). In contrast to nuclei, systems consisting of only neutrons are not self-bound and, therefore, need to be confined in an external potential well. Variations of the external potential, typically a harmonic oscillator potential, can be used to explore different density regimes.

With this input, we compute a range of different properties of neutron drops, such as ground-state energies, radial densities and excitation energies, and compare our IT-NCSM results to previous calculations performed by using phenomenological interactions.

* Supported by DFG (SFB 634), HIC for FAIR and BMBF (06DA7047I)