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Quadrupole collectivity in Ca-42 from low-energy Coulomb excitation with AGATA
Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland.;Univ Warsaw, Fac Phys, PL-00681 Warsaw, Poland.;Univ Oslo, Dept Phys, N-0316 Oslo, Norway.;INFN Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy.;Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England..
Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland.;Univ Paris Saclay, CEA, Irfu, F-91191 Gif Sur Yvette, France..
Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
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2018 (English)In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 97, no 2, article id 024326Article in journal (Refereed) Published
Abstract [en]

ACoulomb-excitation experiment to study electromagnetic properties of Ca-42 was performed using a 170-MeV calcium beam from the TANDEM XPU facility at INFN Laboratori Nazionali di Legnaro. gamma rays from excited states in Ca-42 were measured with the AGATA spectrometer. The magnitudes and relative signs of ten E2 matrix elements coupling six low-lying states in Ca-42, including the diagonal E2 matrix elements of 2(1)(+) and 2(2)(+) 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 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 Ca-42. 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 Ca-42.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 97, no 2, article id 024326
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Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-348990DOI: 10.1103/PhysRevC.97.024326ISI: 000425604200003OAI: oai:DiVA.org:uu-348990DiVA, id: diva2:1201594
Available from: 2018-04-26 Created: 2018-04-26 Last updated: 2018-04-26Bibliographically approved

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Söderström, Pär-Anders

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