Sökning: "branching fraction"
Visar resultat 1 - 5 av 14 avhandlingar innehållade orden branching fraction.
1. Measurements of Oscillator Strengths in Fe, Zr, Mo and Ce
Sammanfattning : Atomic data are needed in many different areas of science and technology. Examples of users are the astronomical community and the lighting industry. In this work, the purpose of the projects has been to produce reliable atomic data needed to solve specific astrophysical problems. LÄS MER
2. Atomic Influences in Stellar Spectroscopy
Sammanfattning : This thesis is a description of how knowledge of atomic physics can be used in a stellar spectrum analysis. Stellar investigations are spectroscopically performed based on wavelengths, intensities and spectral line structure. LÄS MER
3. From Strange to Charm : Meson production in electron-positron collisions
Sammanfattning : Decays of pseudoscalar mesons into a lepton-antilepton pair are very rare within the Standard Model since they cannot proceed via a single photon process. The C-even neutral mesons can be produced in electron-positron collisions by a two-photon intermediate state. LÄS MER
4. Epidemic models with contact tracing: manual and digital tracing
Sammanfattning : Contact tracing is an effective measure for controlling the epidemic spreading. In this thesis, we consider a Markovian SIR epidemic model in a homogeneous community with a constant rate of diagnosis (testing) and investigate the preventive effect of contact tracing. LÄS MER
5. High Resolution Spectroscopy of Singly Charged Ions : Applications of Laser and Fourier Transform Techniques
Sammanfattning : This thesis presents measurements of fundamental properties of singly charged ionic systems including spectral wavelengths, lifetimes of excited states and branching fractions with the main focus on time resolved laser spectroscopy of stored ions providing lifetime measurements of metastable states. The results of these measurements have been used to determine energy levels and transition probabilities of the studied systems. LÄS MER