Elastic alpha scattering experiments and the alpha-nucleus optical potential at low energies

Abstract

High precision angular distribution data of (α,α) A systematic fitting procedure was applied to the presented experimental scattering data to obtain comprehensive local potential parameter sets which are composed of a real folding potential and an imaginary potential of Woods-Saxon surface type. The obtained potential parameters were used in turn to construct a new systematic α-nucleus potential with very few parameters.Although this new potential cannot reproduce the angular distributions with the same small deviations as the local potential, the new potential is able to predict the total reaction cross sections for all cases under study.

High precision113In(α,α)113In elastic scattering at energies near the Coulomb barrie

“…A summary of this work in given in [9,41]. In most cases either semimagic or even-even target nuclei were investigated.…”

“…The real part V (r) of the nuclear potential is determined by a double-folding procedure of the densities of the α projectile and 113 In target (derived from electron scattering [52]) with an effective nucleon-nucleon interaction of the widely used DDM3Y type [53,54] (for details of the folding procedure see also [9,55]). The bare folding potential V F (r) is modified by a strength parameter λ and a width parameter w:…”

“…These works were extended to investigate the variation of the parameters of the OMP along the N = 50 and Z = 48 isotonic and isotopic chains by the study of the 89 Y(α, α) and 106,110,116 Cd(α, α) reactions [39,40]. Based on the high precision data measured at ATOMKI, a new global OMP has been developed [9]. This few-parameter OMP gives a correct description for the total α-induced cross sections [41] and reasonable prediction for α elastic scattering angular distributions.…”

“…= 15.59 (a) and 18.82 MeV (b) vs the angle in the center-of-mass frame. The lines correspond to predictions using different OMPs: from Watanabe [46] as used in [45] (TALYS), from [47] (McFadden), [9] (ATOMKI-V1), [48] (Avrigeanu), and using the fitted local potential described in Sec. III A (local).…”

“…Furthermore, in several astrophysical applications-such as modeling the nucleosynthesis in explosive scenarios like the γ process-the reaction rates are taken from the Hauser-Feshbach (H-F) statistical model [4] using global OMPs [5,6]. Considerable efforts have been devoted in recent years to improve the α + nucleus optical potential parametrizations for astrophysical applications [7][8][9]. In the present work, a comprehensive experimental test of the most recent global OMPs used in γ process network simulations is carried out for the target nucleus 113 In, which is traditionally considered a so-called p nucleus [10][11][12].…”