The equation of motion phonon method and its application in the neutron rich oxygen region
Nuclear Physics Institute, Czech Academy of Sciences, 250 68 Řež, Czech Republic
2 INFN Sezione di Napoli, 80126 Napoli, Italy
3 Faculty of Mathematics and Physics, Charles University, 116 36 Prague, Czech Republic
4 Universitá di Napoli Federico II, 80126 Napoli, Italy
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Published online: 14 November 2018
An equation of motion phonon method, developed for even-even nuclear systems and extended to odd nuclei, is applied to 22O and to its odd neighbors 23O and 23F. A calculation using the chiral potential NNLOopt is carried out in a space encompassing up to two phonons. The computed dipole cross section in 22O and the spectra of 22O and 23O are in a satisfactory agreement with the experimental data. However, the calculation describes poorly the spectrum of 23F. This discrepancy originates from the strong coupling between the odd proton and the 22O phonons of neutron nature. This coupling pushes down in energy several states enhancing the level density at low energy. We suggest that a viable route for the solution of this problem could be the inclusion of the three-body interaction using the new chiral potential NNLOsat.
© The Authors, published by EDP Sciences, 2018
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