Spin–isospin responses via (p,n) and (n,p) reactions

QCD susceptibilities and nuclear matter saturation in a chiral theory: Inclusion of pion loops

“…[10], which takes into account the most recent data analysis: g NN = 0.7, g N = 0.3, g = 0.5, with clear deviations from universality as advocated in Ref. [10]. The spin-spin operator can be decomposed into a longitudinal piece and a transverse one.…”

“…In the numerical calculation we will use the following set of values suggested in Ref. [10], which takes into account the most recent data analysis: g NN = 0.7, g N = 0.3, g = 0.5, with clear deviations from universality as advocated in Ref. [10].…”

“…For what concerns the values of the Landau-Migdal parameters, years of experimental and theoretical investigations have sharpened our knowledge of these quantities. We will exploit here the most recent results, for which a survey is given in a recent article by Ichimura et al [10]. We feel timely to revisit certain problems of nuclear physics and combine in these studies the experience accumulated in the pionic type of physics including chiral aspects and some results of QCD to have simultaneously a description of the nuclear binding and the evolution of chiral symmetry restoration, i.e., of the quark scalar density, and of the QCD susceptibilities.…”

High-resolution study of Gamow-Teller excitations in theCa42(He3,t)Fujita1, Fujita2, Adachi3 et al. 2015Phys. Rev. C4391090View full textAdd to dashboardCite

“…The Ikeda sum rule for GT strengths in nuclei is expressed by ΣB(GT − ) − ΣB(GT + ) = 3(N − Z), where ΣB(GT − ) and ΣB(GT + ) are sums of GT − and GT + transition strengths measured by (p, n)-and (n, p)-type reactions, respectively [2,56]. The quenching of the GT strength compared to the Ikeda sum rule has been a matter of considerable discussion and interest in nuclear physics [2,57].…”

Tensor interaction in mean-field and density functional theory approaches to nuclear structure

“…Such modes of nuclear excitation, like the Gamow-Teller or spin-dipole states, are not only of interest for nuclear structure but also for nuclear astrophysics and particle physics (in connection with β and ββ decays, neutrino mass and its possible Majorana nature). Review papers have been devoted to this topic [11,12]. Many of the currently employed mean-field or DFT-based methods are not well calibrated in the spin-isospin channel and/or suffer from spin and spin-isospin instabilities (i.e., spontaneous magnetization) above some critical density (see, e.g., [13] and references therein).…”