Octupole deformation in some radium isotopes using the spdf-IBM-1
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Date
2024
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad de Concepción
Abstract
En esta tesis hemos realizado un estudio espectroscópico de carácter fenomenológico de los grados de libertad octupolares presentes en la cadena de isótopos de radio 216–228Ra en el contexto del Modelo de Bosones spdf en Interacción (spdf-IBM). Este carácter se debe al desarrollo de una rutina de minimización para la obtención de los parámetros del hamiltoniano utilizado. En particular, analizamos sus espectros de energía, transiciones electromagnéticas entre estados de igual (B(E2)) y distinta paridad (B(E1),B(E3)), y momentos multipolares, pudiendo comparar estos resultados con recientes mediciones experimentales.
El interés en estos isótopos se basa en la presencia de deformación octupolar en ellos, lo que se relaciona con los momentos dipolares eléctricos atómicos, cuya medición puede poner a prueba la simetría CP del Modelo Estándar de la Física de Partículas.
In this thesis we have made a spectroscopic study, of phenomenological nature, of the octupole degrees of freedom present in the radium isotopic chain 216–228Ra in the context of the spdf Interacting Boson Model (spdf-IBM). The phenomenological nature is due to the developement of a minimization routine for obtaining the parameters of the chosen hamiltonian. In particular, we analyze their energy spectra, electromagnetic transitions between states of the same (B(E2)) and different parity ((E1),B(E3)), and the multipole moments, comparing these results with recent experimental measurements. The interest on these isotopes emerges from the presence of octupole deformation in them, which relates with the atomic electric dipole moments, whose measurements may put to test the CP symmetry of the Standard Model of Particle Physics.
In this thesis we have made a spectroscopic study, of phenomenological nature, of the octupole degrees of freedom present in the radium isotopic chain 216–228Ra in the context of the spdf Interacting Boson Model (spdf-IBM). The phenomenological nature is due to the developement of a minimization routine for obtaining the parameters of the chosen hamiltonian. In particular, we analyze their energy spectra, electromagnetic transitions between states of the same (B(E2)) and different parity ((E1),B(E3)), and the multipole moments, comparing these results with recent experimental measurements. The interest on these isotopes emerges from the presence of octupole deformation in them, which relates with the atomic electric dipole moments, whose measurements may put to test the CP symmetry of the Standard Model of Particle Physics.
Description
Tesis presentada para optar al grado de Magíster en Ciencias con Mención en Física.
Keywords
Isotopes, Boson model, Particle physics