Probing the exotic structure of 8B by its elastic scattering and breakup reaction on nuclear targets

Abstract

Abstract. The structure of the exotic 8 B nucleus is studied by means of elastic scattering, as well as its breakup on nuclear targets. We present microscopic calculations of the optical potentials (OPs) and cross sections of elastic scattering of 8 B on 12 C, 58 Ni, and 208 Pb targets at energies 20 < E < 170 MeV. The density distributions of 8 B obtained within the variational Monte Carlo (VMC) model and the three-cluster model (3CM) are used to construct the potentials. The real part of the hybrid OP is calculated using the folding model with the direct and exchange terms included, while the imaginary part is obtained on the base of the high-energy approximation (HEA) and also taken to be equal to the microscopic real part of the OP. In this model the only free parameters are the depths of the real and imaginary parts of OP obtained by fitting the elastic scattering experimental data. It is found a dependence of their values on the model density of 8 B. In addition, cluster model, in which 8

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

“…Second, the extracted (J V ) and (J W ) values from calculations using (real SPP + Imag. WS) approach do present the BTA which agree with the previously reported findings [33,34,37]. 58 Ni density distributions which were obtained from DHB model [25] as was done in SPP calculations.…”

“…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.…”

Microscopic Description of $${^{8}{\hbox {Li}}{+}}$$ 8 Li + Nucleus and of $${^{8}{\hbox {B}}{+}}$$

“…Although the fits presented in Ref. [38] nicely agree with experiment, the associated pa-rameters are open to criticism. These results suggest that the data on 8 B+ 58 Ni could be too large, and should be reconsidered.…”

“…In Ref. [38], the authors use microscopic densities of the 8 B ground state to investigate elastic scattering on different targets. As usual, the folding potential is renormalized to simulate the missing breakup effects.…”

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

“…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. Optimal OM potential parameters for 6 Li + 27 Al and 6 He + 27 Al systems with fixed r V = 1.326 fm, r W = 1.534 fm, a V = 0.811, and a W = 0.844 fm.…”