TY - BOOK ID - 7988735 TI - Extensions to the No-Core Shell Model : Importance-Truncation, Regulators and Reactions PY - 2013 SN - 3319013920 3319013939 PB - Cham : Springer International Publishing : Imprint: Springer, DB - UniCat KW - Laser pulses, Ultrashort. KW - Physics KW - Physical Sciences & Mathematics KW - Nuclear Physics KW - Atomic Physics KW - Nuclear shell theory. KW - Nuclear models. KW - Models, Nuclear KW - Nuclear shell models KW - Nuclear shell structure KW - Shell models (Nuclear physics) KW - Physics. KW - Quantum field theory. KW - String theory. KW - Nuclear physics. KW - Heavy ions. KW - Hadrons. KW - Elementary particles (Physics). KW - Elementary Particles, Quantum Field Theory. KW - Nuclear Physics, Heavy Ions, Hadrons. KW - Quantum Field Theories, String Theory. KW - Nuclear physics KW - Nuclear models KW - Quantum theory. KW - Atomic nuclei KW - Atoms, Nuclei of KW - Nucleus of the atom KW - Quantum dynamics KW - Quantum mechanics KW - Quantum physics KW - Mechanics KW - Thermodynamics KW - Models, String KW - String theory KW - Nuclear reactions KW - Ions KW - Relativistic quantum field theory KW - Field theory (Physics) KW - Quantum theory KW - Relativity (Physics) KW - Elementary particles (Physics) KW - High energy physics KW - Nuclear particles KW - Nucleons UR - https://www.unicat.be/uniCat?func=search&query=sysid:7988735 AB - 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. ER -