Semimicroscopic Description of High-Energy Charge-Exchange Spin-Monopole Excitations in Medium-Heavy Spherical Nuclei

Properties of isoscalar giant multipole resonances in medium-heavy closed-shell nuclei: A semimicroscopic description

“…The adopted parameters 𝜂 𝐿 are found from the condition of the absence of spurious-state excitation by the overtone external field. For the PHDOM-based description of ISGMR one gets: 𝜂 𝐿=0 =1 [8]. The method of evaluating 𝜂 𝐿=1 and a detailed description of the spurious isoscalar dipole state are given in Ref.…”

“…Being a microscopically based extension of the standard [1] and nonstandard [2] versions of the continuum-random-phase approximation (cRPA) to taking the spreading effect into account, the particle-hole dispersive optical model (PHDOM) has been formulated [3] and implemented to describing main properties of various giant resonances (GRs) in medium-heavy closed-shell nuclei [4][5][6][7][8][9]. The GR main characteristics, determined for a wide excitation-energy interval, include the energy-averaged strength distribution and projected (one-body) transition density both related to an appropriate probing operator, and probabilities of direct one-nucleon decay.…”