Abstract
The semi-microscopic approach to the description of giant resonances in medium-heavy mass closed-shell nuclei is implemented to treat partial probabilities of direct-proton decay of the Gamow-Teller giant resonance (GTGR) in 208 Bi. The corresponding experimental data are reasonably explained.
Highlights
Partial probabilities of direct nucleon decay of giant resonances (GRs) carry information about the particle-hole structure and damping mechanisms of GRs. These probabilities should be related to the main properties of GRs and included in their full description
As applied to medium-heavy mass closed-shell nuclei, this aim can be achieved within the semi-microscopic approach to the description of giant resonances (SMAGR)
The SMAGR is a generalization of the standard and non-standard versions of the continuumRandom-Phase-Approximation developed to take into account a spreading effect. The latter is described phenomenologically in terms of the energy-dependent imaginary part of an effective optical-model potential directly used in cRPA equations [2,3]
Summary
Partial probabilities of direct nucleon decay of giant resonances (GRs) carry information about the particle-hole (ph) structure and damping mechanisms of GRs. The SMAGR is a generalization of the standard and non-standard versions of the continuumRandom-Phase-Approximation (cRPA) developed to take into account a spreading effect. The latter is described phenomenologically in terms of the energy-dependent imaginary part of an effective optical-model potential directly used in cRPA equations [2,3]. The same method has later been used for studying proton decay of the GTGR overtone, isovector giant spin-monopole resonance (IVGSMR(−)) in 208Bi [5]. The unique experiment on excitation of the GTGR in 118Sb with the resonance 117Sn(p,ntot)-reaction [6] should be mentioned. Along with the anomalously small total width (≃ 1 MeV), the partial (elastic) proton width of the mentioned GTGR has been measured as well
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