Quadrupole collectivity in 42Ca from low-energy Coulomb excitation with AGATA

David Cullen, et al

    Research output: Contribution to journalArticlepeer-review

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    Abstract

    A Coulomb-excitation experiment to study electromagnetic properties of
    42
    Ca
    was performed using a 170-MeV calcium beam from the TANDEM XPU facility at INFN Laboratori Nazionali di Legnaro.
    γ
    rays from excited states in
    42
    Ca
    were measured with the AGATA spectrometer. The magnitudes and relative signs of ten
    E
    2
    matrix elements coupling six low-lying states in
    42
    Ca
    , including the diagonal
    E
    2
    matrix elements of
    2
    +
    1
    and
    2
    +
    2
    states, were determined using the least-squares code gosia. The obtained set of reduced
    E
    2
    matrix elements was analyzed using the quadrupole sum rule method and yielded overall quadrupole deformation for
    0
    +
    1
    ,
    2
    and
    2
    +
    1
    ,
    2
    states, as well as triaxiality for
    0
    +
    1
    ,
    2
    states, establishing the coexistence of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in
    42
    Ca
    . The experimental results were compared with the state-of-the-art large-scale shell-model and beyond-mean-field calculations, which reproduce well the general picture of shape coexistence in
    42
    Ca
    .
    Original languageEnglish
    JournalPhysical Review C
    DOIs
    Publication statusPublished - 21 Feb 2018

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