Ab initio description of monopole resonances in light- and medium-mass nuclei: III. Moments evaluation in ab initio PGCM calculations
arxiv(2024)
摘要
The paper is the third of a series dedicated to the ab initio description of
monopole giant resonances in mid-mass closed- and open-shell nuclei via the
so-called projected generator coordinate method. The present focus is on the
computation of the moments m_k of the monopole strength distribution, which
are used to quantify its centroid energy and dispersion. First, the capacity to
compute low-order moments via two different methods is developed and
benchmarked for the m_1 moment. Second, the impact of the angular momentum
projection on the centroid energy and dispersion of the monopole strength is
analysed before comparing the results to those obtained from consistent
quasi-particle random phase approximation calculations. Next, the so-called
energy weighted sum rule (EWSR) is investigated. First, the appropriate ESWR in
the center-of-mass frame is derived analytically. Second, the exhaustion of the
intrinsic EWSR is tested in order to quantify the (unwanted) local-gauge
symmetry breaking of the presently employed chiral effective field theory
(χEFT) interactions. Finally, the infinite nuclear matter
incompressibility associated with the employed χEFT interactions is
extracted by extrapolating the finite-nucleus incompressibility computed from
the monopole centroid energy.
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