Torabi, Ramin (2010)
Structure of Beryllium Isotopes in Fermionic Molecular Dynamics.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
Modern theoretical nuclear physics faces two major challenges. The first is finding a suitable interaction, which describes the forces between nucleons. The second challenge is the solution of the nuclear many-body problem for a given nucleus while applying a realistic potential. The potential used in the framework of this thesis is based on the Argonne AV18 potential. It was transformed by means of the Unitary Correlation Operator Method (UCOM) to optimize convergence. The usual phenomenological corrections were applied to improve the potential for the Hilbert space used in Fermionic Molecular Dynamics (FMD). FMD is an approach to solve the nuclear many-body problem. It uses a single-particle basis which is a superposition of Gaussian distributions in phase-space. The most simple many-body state is the antisymmetric product of the single-particle states: a Slater determinant, the so called intrinsic state. This intrinsic state is projected on parity, total angular momentum and a center of mass momentum zero. The Hilbert space is spanned by several of these projected states. The states are obtained by minimizing their energy while demanding certain constraints. The expectation values of Slater determinants, parity projected and additionally total angular momentum projected Slater determinants are used. The states that are relevant in the low energy regime are obtained by diagonalization. The lowest moments of the mass-, proton- or neutron-distribution and the excitation in proton- and neutron-shells of a harmonic oscillator are some of the used constraints. The low energy regime of the Beryllium isotopes with masses 7 to 14 is calculated by using these states. Energies , radii, electromagnetic transitions, magnetic moments and point density distributions of the low lying states are calculated and are presented in this thesis.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2010 | ||||
Autor(en): | Torabi, Ramin | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Structure of Beryllium Isotopes in Fermionic Molecular Dynamics | ||||
Sprache: | Englisch | ||||
Referenten: | Feldmeier, Prof. Dr. Hans ; Roth, Prof. Dr. Robert | ||||
Publikationsjahr: | 7 Januar 2010 | ||||
Ort: | Darmstadt | ||||
Verlag: | Technische Universität | ||||
Datum der mündlichen Prüfung: | 16 Februar 2009 | ||||
URL / URN: | urn:nbn:de:tuda-tuprints-20207 | ||||
Kurzbeschreibung (Abstract): | Modern theoretical nuclear physics faces two major challenges. The first is finding a suitable interaction, which describes the forces between nucleons. The second challenge is the solution of the nuclear many-body problem for a given nucleus while applying a realistic potential. The potential used in the framework of this thesis is based on the Argonne AV18 potential. It was transformed by means of the Unitary Correlation Operator Method (UCOM) to optimize convergence. The usual phenomenological corrections were applied to improve the potential for the Hilbert space used in Fermionic Molecular Dynamics (FMD). FMD is an approach to solve the nuclear many-body problem. It uses a single-particle basis which is a superposition of Gaussian distributions in phase-space. The most simple many-body state is the antisymmetric product of the single-particle states: a Slater determinant, the so called intrinsic state. This intrinsic state is projected on parity, total angular momentum and a center of mass momentum zero. The Hilbert space is spanned by several of these projected states. The states are obtained by minimizing their energy while demanding certain constraints. The expectation values of Slater determinants, parity projected and additionally total angular momentum projected Slater determinants are used. The states that are relevant in the low energy regime are obtained by diagonalization. The lowest moments of the mass-, proton- or neutron-distribution and the excitation in proton- and neutron-shells of a harmonic oscillator are some of the used constraints. The low energy regime of the Beryllium isotopes with masses 7 to 14 is calculated by using these states. Energies , radii, electromagnetic transitions, magnetic moments and point density distributions of the low lying states are calculated and are presented in this thesis. |
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Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik | ||||
Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik > Institut für Kernphysik 05 Fachbereich Physik |
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Hinterlegungsdatum: | 08 Jan 2010 13:28 | ||||
Letzte Änderung: | 05 Mär 2013 09:30 | ||||
PPN: | |||||
Referenten: | Feldmeier, Prof. Dr. Hans ; Roth, Prof. Dr. Robert | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 16 Februar 2009 | ||||
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