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

K. Hadyńska-Klk*, P. J. Napiorkowski, M. Zielińska, J Srebrny, A. Maj, F. Azaiez, J. J. Valiente-Dobón, M Kicińska-Habior, F Nowacki, H Naïdja, B Bounthong, T R Rodríguez, G de Angelis, W T Abraham, G. Anil Kumar, D. Bazzacco, M. Bellato, D. Bortolato, P Bednarczyk, G. BenzoniL. Berti, B. Birkenbach, B. Bruyneel, S. Brambilla, F. Camera, J. Chavas, B Cederwall, Lucie Charles, M Ciemała, P. Cocconi, P J Coleman-Smith, A. Colombo, A. Corsi, F. C. L. Crespi, D. M. Cullen, A. Czermak, P Désesquelles, D. T. Doherty, B Dulny, J Eberth, E Farnea, B. Fornal, S Franchoo, A. Gadea, A. Giaz, A. Gottardo, X. Grave, J. Grebosz, A. Görgen, M. Gulmini, T. Habermann, H. Hess, R Isocrate, J. Iwanicki, G. Jaworski, D S Judson, A. Jungclaus, N. Karkour, M. Kmiecik, D Karpiński, M Kisieliński, N. Kondratyev, A. Korichi, M. Komorowska, M Kowalczyk, W Korten, M. Krzysiek, G. Lehaut, S. Leoni, J. Ljungvall, A. Lopez-Martens, S. Lunardi, G. Maron, K. Mazurek, R. Menegazzo, D. Mengoni, E. Merchán, W. Meczyński, C. Michelagnoli, B. Million, S. Myalski, D. R. Napoli, M. Niikura, A. Obertelli, S.F. Özmen, M. Palacz, L Próchniak, A. Pullia, B. Quintana, G. Rampazzo, F. Recchia, N Redon, P Reiter, D. Rosso, K Rusek, E. Sahin, M. -D. Salsac, P.-A. Söderström, I. Stefan, O. Stézowski, J. Styczeń, Ch. Theisen, N. Toniolo, C. A. Ur, R. Wadsworth, B. Wasilewska, A. Wiens, J. L. Wood, K Wrzosek-Lipska, M. Ziebliński

*Corresponding author for this work

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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.

Original languageEnglish
Article number024326
Pages (from-to)1-20
Number of pages20
JournalPhysical Review C
Issue number2
Publication statusPublished - 21 Feb 2018

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©2018 American Physical Society.

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