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|Title:||Testing ab initio nuclear structure in neutron-rich nuclei: Lifetime measurements of second 2+ state in 16C and 20O|
Crespi, F. C. L.
Cieplicka Orynczak, N.
de France, G.
Harakeh, M. N.
Iskra, L. W.
Kicinska Habior, M.
Lenzi, S. M.
Menéndez Sánchez, Javier
Teoria de camps (Física)
Field theory (Physics)
|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.|
|Note:||Reproducció del document publicat a: https://doi.org/10.1103/PhysRevC.101.021303|
|It is part of:||Physical Review C, 2020, vol. 101, p. 021303|
|Appears in Collections:||Articles publicats en revistes (Física Quàntica i Astrofísica)|
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