Multi-reference many-body perturbation theory for nuclei: II. Ab initio study of neon isotopes via PGCM and IM-NCSM calculations.

Autor: Frosini, M., Duguet, T., Ebran, J.-P., Bally, B., Mongelli, T., Rodríguez, T. R., Roth, R., Somà, V.
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Zdroj: European Physical Journal A -- Hadrons & Nuclei; Apr2022, Vol. 58 Issue 4, p1-23, 23p
Abstrakt: The neon isotopic chain displays a rich phenomenology, ranging from clustering in the ground-state of the self-conjugate doubly open-shell stable 20 Ne isotope to the physics of the island of inversion around the neutron-rich 30 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]. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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