Ciemala, M, Ziliani, S, Crespi, FCL, Leoni, S, Fornal, B, Maj, A, Bednarczyk, P, Benzoni, G, Bracco, A, Boiano, C et al (show 84 more authors)
(2020)
Testing ab initio nuclear structure in neutron-rich nuclei: Lifetime measurements of second 2(+) state in C-16 and O-20.
Physical Review C: Nuclear Physics, 101 (2).
021303-.
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.
Item Type: | Article |
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Uncontrolled Keywords: | 5106 Nuclear and Plasma Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences, 7 Affordable and Clean Energy |
Depositing User: | Symplectic Admin |
Date Deposited: | 16 Apr 2020 13:02 |
Last Modified: | 21 Jun 2024 00:46 |
DOI: | 10.1103/PhysRevC.101.021303 |
Open Access URL: | https://journals.aps.org/prc/abstract/10.1103/Phys... |
Related URLs: | |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3083477 |