Quadrupole collectivity in <SUP>42</SUP>Ca from low-energy Coulomb excitation with AGATA

Hadynska-Klek, K, Napiorkowski, PJ, Zielinska, M, Srebrny, J, Maj, A, Azaiez, F, Dobon, JJ Valiente, Kicinska-Habior, M, Nowacki, F, Naidja, H
et al (show 100 more authors) (2018) Quadrupole collectivity in <SUP>42</SUP>Ca from low-energy Coulomb excitation with AGATA. PHYSICAL REVIEW C, 97 (2). 024326-.

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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.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 17 Jan 2020 16:49
Last Modified: 16 Mar 2024 21:46
DOI: 10.1103/PhysRevC.97.024326
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3071040