Search for dissertations about: "giant dipole resonance"

Found 5 swedish dissertations containing the words giant dipole resonance.

  2. 1. Giant Dipole Resonances as Probes of Local Environment in Molecules, Clusters and Solidsl

    Author : Jarek Luberek; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; single center; photoionization; fullerene; coupled channels; LDA; giant dipole resonance; embedded; time-dependent local density;

    Abstract : In this thesis, I study effects of the local environment on the giant dipole resonances (GDR) in lanthanides and actinides. The effects of embedding in jellium, bonding in small molecules and incorporation into different fullerene systems are studied. READ MORE

  4. 2. High-Resolution Measurement of the 4He(g,n) Reaction in the Giant Resonance Region

    Author : Björn Nilsson; Kärnfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; tagged photons; photonuclear reactions; liquid helium; neutron detectors; liquid scintillators; giant resonances; angular distributions; differential cross sections; total cross sections; Nuclear physics; Kärnfysik; Fysicumarkivet A:2003:Nilsson;

    Abstract : A comprehensive near-threshold 4He(g,n) absolute cross section measurement has been performed at the high-resolution tagged-photon facility MAX-lab located in Lund, Sweden. The 20 < Eg < 45 MeV tagged photons (covering the Giant Dipole Resonance energy region) were directed towards a liquid 4He target, and knocked-out neutrons were detected in a pair of 60 cm x 60 cm vetoed NE213A liquid scintillator arrays. READ MORE

  5. 3. Necked-in Superdeformed Nuclei

    Author : Lars-Ove Jönsson; Matematisk fysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Matematisk och allmän teoretisk fysik; thermodynamics; statistical physics; gravitation; cranked Nilsson-Strutinsky; superdeformation; necked-in shapes; RPA; giant dipole resonance; finite-range liquid drop model; Mathematical and general theoretical physics; classical mechanics; relativity; quantum mechanics; klassisk mekanik; kvantmekanik; relativitet; statistisk fysik; termodynamik; Fysicumarkivet A:1997:Jönsson;

    Abstract : Superdeformation, i.e. elongated shapes with the longest axis approximately twice as long as the shorter axes, has provided many new insights in nuclear structure. In this dissertation the possibility of forming superdeformed states related to two connected spheres, having a more or less pronounced neck, is investigated. READ MORE

  6. 4. Optimization of High-order Harmonic Generation for Attosecond Science

    Author : Robin Weissenbilder; Atomfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; High-order Harmonic Generation; Attosecond Pulse Train; attosecond dynamics; photoelectron interferometry; Quantum state tomography; Phase matching; Fysicumarkivet A:2023:Weissenbilder;

    Abstract : High-order harmonic generation is a highly nonlinear, though inherently inefficient, process which can lead to emission of coherent, broadband extreme ultraviolet radiation in the form of attosecond pulses. Attosecond pulses are crucial for experiments investigating photoionization dynamics on the femto- and attosecond timescales. READ MORE

  7. 5. Attosecond photoelectron interferometry: from wavepackets to density matrices

    Author : Hugo Laurell; Atomfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Quantum state tomography; Decoherence; Photoionization; Fysicumarkivet A:2023:Laurell;

    Abstract : Through the advent of high-order harmonic generation and attosecond light pulses, photoionization dynamics has been studied on the attosecond time-scale, the intrinsic time-scale of such dynamics. When the electron leaves the atomic potential a phase shift is imprinted on the electron wavefunction. READ MORE