Quadrupole collectivity in Ca42 from low-energy Coulomb excitation with AGATA

K. Hadyńska-Klȩk et al.
Phys. Rev. C 97, 024326 – Published 21 February 2018

Abstract

A Coulomb-excitation experiment to study electromagnetic properties of Ca42 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 Ca42 were measured with the AGATA spectrometer. The magnitudes and relative signs of ten E2 matrix elements coupling six low-lying states in Ca42, including the diagonal E2 matrix elements of 21+ and 22+ states, were determined using the least-squares code gosia. The obtained set of reduced E2 matrix elements was analyzed using the quadrupole sum rule method and yielded overall quadrupole deformation for 01,2+ and 21,2+ states, as well as triaxiality for 01,2+ states, establishing the coexistence of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in Ca42. 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 Ca42.

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  • Received 22 September 2017

DOI:https://doi.org/10.1103/PhysRevC.97.024326

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 97, Iss. 2 — February 2018

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