https://doi.org/10.1140/epja/s10050-022-00693-y
Regular Article - Theoretical Physics
Multi-reference many-body perturbation theory for nuclei
II. Ab initio study of neon isotopes via PGCM and IM-NCSM calculations
1
IRFU, CEA, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
2
KU Leuven, Department of Physics and Astronomy, Instituut voor Kernen Stralingsfysica, 3001, Leuven, Belgium
3
CEA, DAM, DIF, 91297, Arpajon, France
4
Laboratoire Matière en Conditions Extrêmes, Université Paris-Saclay, CEA, 91680, Bruyères-le-Châtel, France
5
Departamento de Física Teórica, Universidad Autónoma de Madrid, 28049, Madrid, Spain
6
Centro de Investigación Avanzada en Física Fundamental-CIAFF-UAM, 28049, Madrid, Spain
7
Institut für Kernphysik, Technische Universität Darmstadt, 64289, Darmstadt, Germany
8
Helmholtz Forschungsakademie Hessen für FAIR, GSI Helmholtzzentrum, 64289, Darmstadt, Germany
Received:
29
October
2021
Accepted:
22
February
2022
Published online:
11
April
2022
The neon isotopic chain displays a rich phenomenology, ranging from clustering in the ground-state of the self-conjugate doubly open-shell stable Ne isotope to the physics of the island of inversion around the neutron-rich Ne isotope. This second (i.e. Paper II) of the present series proposes an extensive ab initio study of neon isotopes based on two complementary many-body methods, i.e. the quasi-exact in-medium no-core shell model (IM-NCSM) and the projected generator coordinate method (PGCM) that is ideally suited to capturing strong static correlations associated with shape deformation and fluctuations. Calculations employ a state-of-the-art generation of chiral effective field theory Hamiltonians and evaluate the associated systematic uncertainties. In spite of missing so-called dynamical correlations, which can be added via the multi-reference perturbation theory proposed in the first paper (i.e. Paper I) of the present series [1], the PGCM is shown to be a suitable method to tackle the low-lying spectroscopy of complex nuclei. Still, describing the physics of the island of inversion constitutes a challenge that seems to require the inclusion of dynamical correlations. This is addressed in the third paper (i.e. Paper III) of the present series [2].
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022