Large-angle elastic scattering of α-particles from 20Ne and 22Ne

Elasticα+Ne20scattering in theα+OYang1, Tan2, Li3 2010Phys. Rev. C161230View full textAdd to dashboardCite

“…The α scattering on some light and medium-heavy nuclei exhibit strong enhancement of cross section at backward angles [i.e., the so-called anomalous large angle scattering (ALAS)]. This phenomenon brought considerable interest and was explained by various approaches (e.g., modified WoodsSaxon potential, L-dependent potential, folding potential, α exchange, Regge poles, and so on [1][2][3][4][5][6][7][8][9][10][11][12]). …”

“…In Ref. [6], the elastic α+ 20 Ne scattering at incident energies of 25. 8,27.0, and 31.1 MeV have been analyzed in terms of a single Regge pole [by adding a Regge pole S l (Reg) to the optical model S matrix S l (diff), the two complex parameters were obtained from best fits to the data], and good fits to the experimental data were obtained.…”

“…For the elastic α+ 20 Ne scattering, there have been the measured differential cross sections over complete angular range: in the lower incident energy region, the angular distributions at E α = 16.8 MeV [3], 18.0 MeV [4], 20.2-23.0 MeV [5], and 25.8-31.1 MeV [6]; in higher incident energy region, the very detailed measured angular distribution at E α = 54.1 MeV [7]. All these experimental angular distributions exhibit remarkable ALAS features.…”

Lower Energy α Elastic Scattering on 20 Ne and Anomaly of α+ 20 Ne Scattering System

“…[3] And the 26-31 MeV data was analyzed by a Woods-Saxon potential with six free parameters and by adding a Regge pole S l (Reg) to the optical model S matrix S l (diff). [4] These phenomenological potential analyses provided reasonable description of α+ 20 Ne scattering respectively for the considered data. At present, there is no consistent analysis for all the existing data.…”

Resonances in low energy elastic scattering of ?-particles from28Si

“…Consequently the average S-matrix for each partial wave l, can be expressed as [15] r(2~+ 1) where S~ m are optical potential S-matrix elements and r and c~ are complex parameters associated with a Regge pole, as described in [16]. It can be shown [17] that a Regge pole is equivalent to a BreitWigner type of resonance.…”