Fragmentation energy shift of giant nuclear resonances

Damping of simple modes of high-energy nuclear excitations: dispersive optical models and their implementations

“…Being the phenomenological quantity, the imaginary part of the mentioned strength, W(ω), determines the real part, P(ω), via the proper dispersive relationship [3,10]. The comments to derivation of the basic expression (2) are the following [3].…”

“…can be used together with the simplest parameterization of W: 2W(ω) = αω 2 /(1 + (ω/B) 2 ) [10]. Here, the strength parameter α and "saturation" parameter B are adjustable quantities (a saturationlike energy dependence of W(ω) follows from the above-mentioned analysis of the total width of various giant resonances).…”

“…(It is supposed, that the spreading effect appears at a finite excitation energy ω min = ∆). The dispersive relationship is properly adopted [3,10].…”

“…As it follows from the expressions (2), (10), within the modified discrete-PHDOM version spurious (isoscalar monopole (ISM)) transitions induced by the unit external field are strictly forbidden. The approximate transformation of A m 0 (x, x , ω) to the expression, in which the s. p. continuum is taken into account, leads to appearance of properly modified optical-model Green functions and continuum-state wave functions.…”

On the direct and semidirect neutron radiative capture by medium-heavy mass nuclei

“…The above mentioned imaginary part is parameterized by an universal function, having the saturation-like energy dependence, with intensity α (MeV −1 ) chosen to describe the experimental total width of a given GR. Being appeared due to the spreading effect, the real part of the effective s. p. optical-model poa e-mail: tulupov@cpc.inr.ac.ru tential P(ω) is determined by the imaginary part via the proper dispersive relationship [4]. The unique feature of the SMAGR is its ability to describe direct-nucleon-decay properties of various GRs without the use of specific adjustable parameters.…”