Uniform α-nucleus potential in a wide range of masses and energies

Abstract

We have reanalyzed elastic ␣ scattering data on many target nuclei from 40 Ca up to 208 Pb over a wide range of energies. Using double-folded potentials we have obtained excellent agreement between the experimental scattering data and our optical model calculations. In addition, bound state properties have been calculated successfully. A systematic behavior of the energy and mass dependence of the strengths of the real and imaginary potentials has been found.PACS number͑s͒: 24.10.Ht, 25.55.Ci

Complementary optical-potential analysis of -particle elastic scattering and induced reactions at low energies

“…Actually, the differences between these volume integrals of microscopic DF and phenomenological real potentials are simply due to their different radial dependence, which should be taken into account when the two types of potentials are compared. Therefore we have once more found [12] that our J R values correspond to microscopic DFM volume integrals which are 10% lower than expected from the systematics found in [19,24,25,71,74]. They are also similar to those obtained by using the semi-microscopic potential III of Ref.…”

“…A global α-nucleus optical potential has been proposed by the BARC group [23] for A ∼12-209 and energies from the Coulomb barrier up to about 140 MeV, based on the systematics of the real and imaginary potential volume integrals established by Atzrott et al [24] by using a DFM real part and the description in a unified way of elastic scattering data for A=40-208 and energies from 30 to 150 MeV, as well as bound state properties. The BARC global potential has been found to describe well the high energy elastic-scattering data, while at lower energies the calculations and the data differ considerably and further investigation has been found necessary [23].…”

Elastic α scattering onSn112andSn124at astrophysi

“…MeV [18,20,29]. The data show a systematic smooth linear decrease at higher energies, in good agreement with the parameterization adopted for the 112 Sn and 124 Sn isotopes (solid line).…”

“…where V F (r) is the double-folding potential which is calculated according to [26,27,28,29] using the computer code DFOLD. The required density distributions of the α particle and the 112,124 Sn nuclei were derived from measured charge density distributions [30].…”

“…The required density distributions of the α particle and the 112,124 Sn nuclei were derived from measured charge density distributions [30]. We vary the strength of the double-folding potential by the parameter λ, adopting values around 1.2 and 1.4 (similar to previous works [18,20,29]). This reduces the so-called family problem of α-nucleus potentials at low energies (see Refs.…”