Excitation functions for the radionuclide⁴⁶Sc produced in the irradiation of⁴⁵Sc with deuterons and⁶He

Abstract

Results of the measurements of the excitation function in the deuteron-induced reaction 45 Sc(d, p) 46 Sc have been obtained at the energy of incident deuterons up to 11.7 MeV. In addition, data for the 45 Sc(d, t) 44 Sc reaction were obtained. The experiments were performed using the variable energy cyclotron U-120M (NPI, Řež) and the Electrostatic Generator EG-5 (FLNP, JINR). The cross sections of the induced activities were measured using the stacked-foil technique. The measured excitation functions were similar to those observed for the 45 Sc( 6 He, 5 He * ) 46 Sc reaction, studied at the accelerator complex for radioactive beams DRIBs (FLNR, JINR). The maximum probability of producing 46 Sc was also found close to the Coulomb barriers of these reactions. The compilation of available experimental data, obtained at deuteron and 6 He-energies near the Coulomb barrier, showed that the values of the cross sections at the maxima of the excitation functions obtained in (d, p) reactions and the reactions for one-neutron pickup from the 6 He projectiles have a different Z-dependence.

Deuteron-induced reaction mechanisms at low energies

“…On the other hand, omission of the transfer reaction contributions to the deuteron activation cross sections can be hidden by inadequate values adopted for various model parameters. Unfortunately, this seems to be the case of a recent analysis of deuteron interactions concerning the excitation functions of the 45 Sc(d, p) 46 Sc and 45 Sc(d, t) 44 Sc reactions [30]. It has considered the PE and CN processes by using the codes TALYS-1.2 [26] and EMPIRE [31], but ignoring the stripping (d, p) and pick-up (d, t) [30] in such conditions has determined us to reanalyze these reactions [32].…”

“…Therefore a strong direct stripping contribution is maybe hidden by PE and CN parameters alteration by Skobelev et al in Ref. [30].…”

“…On the other hand, no free parameter have been involved for the PE description 07003-p.5 [30], and the calculated results obtained by using the code TALYS-1.2 [26] with default input parameters (dotted curves) as well as adjusted [30] OMP volume radius for deuterons (dashed) as well as for deuterons and protons (solid).…”

“…[30] for the reduced radius of the optical model (OM) volume potentials. The adjustment has been applied to both deuteron and proton OM potentials since no definite notice has been given in Ref.…”

“…The adjustment has been applied to both deuteron and proton OM potentials since no definite notice has been given in Ref. [30] on which it should be applied. The corresponding effects led together to an increase of the (d, p) reaction cross section from ∼40% around the Coulomb barrier to less than 20% at 11.7 MeV.…”