Search for dissertations about: "Scattering resonances"

Showing result 1 - 5 of 41 swedish dissertations containing the words Scattering resonances.

  1. 1. Resonances of Dirac Operators

    University dissertation from Uppsala : Department of Mathematics

    Author : Jimmy Kungsman; Wolfgang Staubach; Roman Schubert; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Semiclassical analysis; Dirac operator; resonances; Poisson trace formula; scattering theory; complex absorbing potential; pseudodifferential operator; Mathematics; Matematik;

    Abstract : This thesis consists of a summary of four papers dealing with resonances of Dirac operators on Euclidean 3-space. In Paper I we show that the Complex Absorbing Potential (CAP) method is valid in the semiclassical limit for resonances sufficiently close to the real line if the potential is smooth and compactly supported. READ MORE

  2. 2. Exploring the Exotic Experimental Investigations far from Stability

    University dissertation from Uppsala : Department of Mathematics

    Author : K. Markenroth; [2001]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; N; C; B; Breakup reactions; Cross sections; Driplines; Elastic resonance scattering; Halo nuclei; Inbeam γ spectroscopy; Longitudinal momentum distributions; Projectile fragmentation; Resonances; Unbound nuclei; cross sections; driplines; inbeam spectroscopy; 10; unbound nuclei; 8 B; 11; 17; longitudinal momentum distributions; breakup reactions; projectile fragmentation; resonances; 19 C; elastic resonance scattering; halo nuclei; 13 N;

    Abstract : The exploration of exotic nuclei is one of the most intriguing and fastest expanding fields in modern nuclear physics. In the extreme conditions of unsymmetric neutron-proton distributions and small binding energies many nuclear phenomena not encountered closer to stability have revealed themselves, often as a surprise to the nuclear physics community, the prime example being the development of halo structures as the binding energy diminishes. READ MORE

  3. 3. Ways of determining and characterising resonances in scattering processes

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Ksenia Shilyaeva; Nils Elander; Dage Sundholm; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; quantum scattering theory; complex scaling; resonances; NATURAL SCIENCES Physics Atomic and molecular physics Molecular physics; NATURVETENSKAP Fysik Atom- och molekylfysik Molekylfysik; Physics; fysik;

    Abstract : Scattering cross sections very often display structures. To clarify if these structures correspond to resonances one has to check if they are poles of the scattering matrix (S-matrix) in the fourth quadrant of the complex momentum plane. Furthermore, the states corresponding to these poles also need to have an appropriate scattering amplitude. READ MORE

  4. 4. Inverse scattering and distribution of resonances on the real line

    University dissertation from Department of Mathematics, Lund University

    Author : Michael Hitrik; [1998]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mathematics; scattering poles; reflection coefficient; Schrödinger operator; inverse scattering; Matematik;

    Abstract : We study aspects of scattering theory for the Schrödinger operator on the real line. In the first part of the thesis we consider potentials supported by a half-line, and we are interested in the inverse problem of reconstruction of the potential from the knowledge of values of the reflection coefficient at equidistributed points on the positive imaginary axis. READ MORE

  5. 5. Reliable hp finite element computations of scattering resonances in nano optics

    University dissertation from Umeå : Umeå Universitet

    Author : Juan Carlos Araujo-Cabarcas; Christian Engström; David Cohen; Mats G. Larson; Jeffrey Ovall; [2019]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Scattering resonances; Helmholtz problems; pseudospectrum; Lippmann-Schwinger equation; finite element methods; nonlinear eigenvalue problems; spurious solutions;

    Abstract : Eigenfrequencies are commonly studied in wave propagation problems, as they are important in the analysis of closed cavities such as a microwave oven. For open systems, energy leaks into infinity and therefore scattering resonances are used instead of eigenfrequencies. READ MORE