Three-Nucleon Forces Through Normal-Ordered Approximations

Examensarbete för masterexamen

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Type: Examensarbete för masterexamen
Master Thesis
Title: Three-Nucleon Forces Through Normal-Ordered Approximations
Authors: Fahlin Strömberg, Dag
Abstract: Three-body forces have long been known to play an important role in nuclear physics. However, fully including such interactions in ab-initio methods is computationally expensive and not feasible for larger nuclei. As an alternative, approximations based on normal-ordering with respect to a Fermi state of the nucleus can be used. In this framework part of the three-body interaction can be expressed as lower order interactions, which can be included without increasing the computational complexity. This thesis provides a full derivation of the normal-ordered two-body (NO2B) approximation for closed-shell nuclei. In addition, a simple implementation of this method is described. This is then used to calculate ground states of helium-4 in small model spaces, which are compared to the corresponding calculations with full three-body forces. The results show a relative error of less than 1.5%, in line with earlier studies.
Keywords: Energi;Grundläggande vetenskaper;Hållbar utveckling;Innovation och entreprenörskap (nyttiggörande);Fysik;Energy;Basic Sciences;Sustainable Development;Innovation & Entrepreneurship;Physical Sciences
Issue Date: 2016
Publisher: Chalmers tekniska högskola / Institutionen för fysik (Chalmers)
Chalmers University of Technology / Department of Physics (Chalmers)
Collection:Examensarbeten för masterexamen // Master Theses

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