Search for dissertations about: "branching fraction"

Showing result 1 - 5 of 14 swedish dissertations containing the words branching fraction.

  2. 1. Measurements of Oscillator Strengths in Fe, Zr, Mo and Ce

    Author : Carl Martin Sikström; Fysiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; cerium; molybdenum; Atomic and molecular physics; Atom- och molekylärfysik; Condensed matter:electronic structure; magnetic and optical properties; electrical; magnetic resonance; supraconductors; relaxation; spectroscopy; Kondenserade materiens egenskaper:elektronstruktur; egenskaper elektriska; astrophysics; magnetiska och optiska ; spektroskopi; oscillator strengths; supraledare; zirconium; magnetisk resonans; Fourier transform spectroscopy; branching fraction; radiative lifetimes; iron;

    Abstract : 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. READ MORE

  4. 2. Atomic Influences in Stellar Spectroscopy

    Author : Krister Nielsen; Atomfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; magnetic and optical properties; supraconductors; magnetic resonance; relaxation; Kondenserade materiens egenskaper:elektronstruktur; spectroscopy; rymdvetenskap; kosmisk kemi; Astronomi; Astronomy; spektroskopi; magnetisk resonans; supraledare; magnetiska och optiska ; egenskaper elektriska; space research; cosmic chemistry; stellar magnetic fields; branching fractions; spectral line structure; Fysicumarkivet A:2002:Nielsen; Condensed matter:electronic structure; line blending; electrical;

    Abstract : 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. READ MORE

  5. 3. From Strange to Charm : Meson production in electron-positron collisions

    Author : Joachim Pettersson; Karin Schönning; Andrzej Kupsc; Simon Eidelman; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Hadron physics; Hadronic decays; Light mesons; Charmonium; Meson production; BESIII; Fysik med inriktning mot kärnfysik; Physics with specialization in Nuclear Physics;

    Abstract : 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. READ MORE

  6. 4. Epidemic models with contact tracing: manual and digital tracing

    Author : Dongni Zhang; Tom Britton; Peter Olofsson; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; matematisk statistik; Mathematical Statistics;

    Abstract : 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. READ MORE

  7. 5. High Resolution Spectroscopy of Singly Charged Ions : Applications of Laser and Fourier Transform Techniques

    Author : Jonas Gurell; Sven Mannervik; Richard Holt; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Atomic physics; Atomfysik; fysik; Physics;

    Abstract : 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. READ MORE