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Title: Testing ab initio nuclear structure in neutron-rich nuclei: Lifetime measurements of second 2+ state in 16C and 20O
Author: Ciemala, M.
Ziliani, S.
Crespi, F. C. L.
Leoni, S.
Fornnal, B.
Maj, A.
Bednarczyk, P.
Benzoni, G.
Bracco, A.
Boiano, C.
Bottoni, S.
Brambilla, S.
Bast, M.
Beckers, M.
Braunroth, T.
Camera, F.
Cieplicka Orynczak, N.
Clément, E.
Coelli, S.
Dorvaux, O.
Erturk, S.
de France, G.
Fransen, C.
Goldkuhle, A.
Grebosz, J.
Harakeh, M. N.
Iskra, L. W.
Jacquot, B.
Karpov, A.
Kicinska Habior, M.
Kim, Y.
Kmiecik, M.
Lemasson, A.
Lenzi, S. M.
Lewitowicz, M.
Li, H.
Matea, I.
Mazurek, I.
Michelagnoli, C.
Menéndez Sánchez, Javier
Keywords: Electromagnetisme
Teoria de camps (Física)
Field theory (Physics)
Issue Date: 27-Feb-2020
Publisher: American Physical Society
Abstract: To test the predictive power of ab initio nuclear structure theory, the lifetime of the second 2+ state in neutron-rich 20O,τ(2+2)=150+80−30fs, and an estimate for the lifetime of the second 2+ state in 16C have been obtained for the first time. The results were achieved via a novel Monte Carlo technique that allowed us to measure nuclear state lifetimes in the tens-to-hundreds of femtoseconds range by analyzing the Doppler-shifted γ-transition line shapes of products of low-energy transfer and deep-inelastic processes in the reaction 18O(7.0MeV/u)+181Ta. The requested sensitivity could only be reached owing to the excellent performances of the Advanced γ-Tracking Array AGATA, coupled to the PARIS scintillator array and to the VAMOS++ magnetic spectrometer. The experimental lifetimes agree with predictions of ab initio calculations using two- and three-nucleon interactions, obtained with the valence-space in-medium similarity renormalization group for 20O and with the no-core shell model for 16C. The present measurement shows the power of electromagnetic observables, determined with high-precision γ spectroscopy, to assess the quality of first-principles nuclear structure calculations, complementing common benchmarks based on nuclear energies. The proposed experimental approach will be essential for short lifetime measurements in unexplored regions of the nuclear chart, including r-process nuclei, when intense beams, produced by Isotope Separation On-Line (ISOL) techniques, become available.
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It is part of: Physical Review C, 2020, vol. 101, p. 021303
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ISSN: 2469-9985
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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