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Bridging scales in nuclear physics

Daniel Sääf (Institutionen för fysik (Chalmers))
Göteborg : Chalmers University of Technology, 2016. ISBN: 978-91-7597-408-8.
[Doktorsavhandling]

In this thesis we present the ab initio no-core shell model (NCSM) and use this framework to study light atomic nuclei with realistic nucleon-nucleon interactions. In particular, we present results for radii and ground-state energies of systems with up to twelve nucleons. Since the NCSM uses a finite harmonic oscillator basis, we need to apply corrections to compute basis-independent results. The derivation, application, and analysis of such corrections constitute important results that are presented in this thesis. Furthermore, we compute three-body overlap functions from microscopic wave functions obtained in the NCSM in order to study the onset of clusterization in many-body systems. In particular, we study the Borromean two-neutron halo state in 6He by computing the overlap function < 6He(0+)|4He(0+) + n + n >. We can thereby demonstrate that the clusterization is driven by the Pauli principle. Finally, we develop state-of-the-art computational tools to efficiently extract one- and two-body transition densities from microscopic wave functions. These quantities are important properties of many-body systems and are keys to compute structural observables. In this work we study the core-swelling effect in 6He by computing the average distance between nucleons.



Denna post skapades 2016-05-12. Senast ändrad 2016-05-19.
CPL Pubid: 236353

 

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Institutioner (Chalmers)

Institutionen för fysik (Chalmers)

Ämnesområden

Fysik
Kärnfysik
Lågenergifysik

Chalmers infrastruktur

C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)

Relaterade publikationer

Inkluderade delarbeten:


Microscopic description of translationally invariant core+N+N overlap functions


Infrared length scale and extrapolations for the no-core shell model


Examination

Datum: 2016-06-09
Tid: 13:15
Lokal: PJ-salen, Origo, Fysikgården 2B Chalmers
Opponent: Prof. Calvin W. Johnson

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