New measurements and reanalysis of ¹⁴N elastic scattering on ¹⁰B target *

Abstract

The angular distributions of elastic scattering of 14N ions on 10B targets have been measured at incident beam energies of 21.0 and 24.5 MeV. Angular distributions at higher energies 38–94.0 MeV (previously measured) were also included in the analysis. All data were analyzed within the framework of the optical model and the distorted waves Born approximation method. The observed rise in cross sections at large angles was interpreted as a possible contribution of the α-cluster exchange mechanism. Spectroscopic amplitudes SA 2 and SA 4 for the configuration 14N→ 10B +α were extracted. Their average values are 0.58±0.10 and 0.81±0.12 for SA 2 and SA 4, respectively, suggesting that the exchange mechanism is a major component of the elastic scattering for this system. The energy dependence of the depths for the real and imaginary potentials was found.

Detailed analysis of the 6Li breakup in the field of the 209Bi nucleus

“…The values of J V , J W , σ R are given. of the OM analysis, the typical TA well seen in systems involving bounded projectiles [40][41][42][43] is absent in the 6 Li + 209 Bi system. The absence of TA was noticed in systems involving WB projectiles, a phenomenon known as the breakup threshold anomaly (BTA) [44].…”

Extensive investigation of the 6Li + 27Al and 6He + 27Al systems using different models

“…Instead of dropping to zero with diminishing energy, the imaginary potential initially displays an upward trend. According to the OM analysis, the usual threshold anomaly (TA), which is present in many systems induced by tightly bounded projectiles [48][49][50][51], is confirmed to be absent. The absence of TA that was observed in some systems induced by weak projectiles [52,53] is known as the breakup threshold Table 1.…”

Elastic scattering of 7Li+58Ni: a phenomenological and microscopic analysis

“…It is clearly shown that, the extracted (J V ) and (J W ) values don not obey the usual dispersion relation (localized peak followed by a continuous decrease in J V values, and direct increase followed by nearly constant energy dependence for J W values). The performed OM analysis gives an evidence for the absence of usual threshold anomaly (TA) which is presented in many systems induced by tightly bounded pro-jectiles [29][30][31][32]. This absence of TA is observed in some systems induced by weakly projectiles [33,34], the so called break-up threshold anomaly (BTA) phenomenon.…”