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Extensions to the No-Core Shell Model presents three extensions to the No-Core Shell Model (NCSM) that allow for calculations of heavier nuclei, specifically for the p-shell nuclei. The Importance-Truncated NCSM (IT-NCSM) formulated on arguments of multi-configurational perturbation theory selects a small set of basis states from the initially large basis space in which the Hamiltonian is diagonalized. Previous IT-NCSM calculations have proven reliable, however, there has been no thorough investigation of the inherent error in the truncated IT-NCSM calculations. §This thesis provides a detailed study of IT-NCSM calculations and compares them to full NCSM calculations to judge the accuracy of IT-NCSM in heavier nuclei. When IT-NCSM calculations are performed, one often needs to extrapolate the ground-state energy from the finite basis (or model) spaces to the full NCSM model space. In this thesis a careful investigation of the extrapolation procedures was performed. On a related note, extrapolations in the NCSM are commonplace, but up to recently did not have the ultraviolet (UV) or infrared (IR) physics under control. This work additionally presents a method that maps the NCSM parameters into an effective-field theory inspired framework, in which the UV and IR physics are treated appropriately. The NCSM is well-suited to describe bound-state properties of nuclei, but is not well-adapted to describe loosely bound systems, such as the exotic nuclei near the neutron drip line. With the inclusion of the Resonating Group Method (RGM), the NCSM / RGM can provide a first-principles description of exotic nuclei and the first extension of the NCSM.§

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Zařazení knihy Knihy v angličtině Mathematics & science Physics Atomic & molecular physics

• Plný název: Extensions to the No-Core Shell Model
• Podnázev: Importance-Truncation, Regulators and Reactions
• Autor: Michael Karl Gerhard Kruse
• Jazyk: Angličtina
• Vazba: Pevná
• Počet stran: 126
• EAN: 9783319013923
• ISBN: 3319013920
• ID: 01469183
• Nakladatelství: Springer International Publishing AG
• Hmotnost: 3376 g
• Rozměry: 235 × 155 × 11 mm
• Datum vydání: 05. September 2013

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