Nuclear Structure and Exotic Decays; Doubly-Magic 56Ni and Semi-Magic 58Ni

Emma Johansson

    Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

    Sammanfattning

    The nuclear structure of two nuclei, 56Ni and 58Ni, has been studied using fusion-evaporation
    reaction experiments. The experiments were performed at the Lawrence
    Berkeley and Argonne National Laboratories in the U.S.A.

    The number of known spherical and deformed states in 56Ni has been
    significantly extended. One case of prompt proton emission from a
    well-deformed excited state into the ground state of 55Co was established. The spherical excited states were interpreted within the
    spherical shell model, revealing a good agreement between theory and
    experiment, with one notable exception for the yrast and yrare 8+ states. The
    deformed states were interpreted using Cranked Nilsson-Strutinsky
    calculations, again with very accurate results.

    A similar investigation was performed for 58Ni, resulting in one of the
    most extensive level schemes known for nuclei. High-spin states including
    several rotational bands were found, and a significant number of
    spherical and normally deformed states were also discovered. The rotational
    bands were interpreted through Cranked Nilsson-Strutinsky calculations,
    which allowed the configurations of the bands to be determined. The
    normally deformed states of 58Ni were investigated with spherical
    shell-model calculations, using two different interactions. The
    results are in general satisfactory. The results indicate, however,
    that further improvements of the theoretical calculations demands an
    increase of the number of
    subshells, allowed in the effective interactions.
    A total of 12 prompt proton decays and two prompt alpha decays were
    discovered in 58Ni. This is the
    highest number of known particle decays of this type for any nucleus,
    to date. New aspects of the proton decays have been observed, for
    instance, two cases of in-band decays and two levels which decay with
    competing proton, alpha, and gamma branches.
    Originalspråkengelska
    KvalifikationDoktor
    Tilldelande institution
    Handledare
    • Rudolph, Dirk, handledare
    Tilldelningsdatum2009 jan. 23
    ISBN (tryckt)978-91-628-7679-1
    StatusPublished - 2009

    Bibliografisk information

    Defence details

    Date: 2009-01-23
    Time: 13:15
    Place: Sal B, Fysiska instutionen

    External reviewer(s)

    Name: Bruce, Alison
    Title: Professor
    Affiliation: University of Brighton, Brighton, U.K.

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    Ämnesklassifikation (UKÄ)

    • Subatomär fysik

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