Study of the threshold anomaly in the elastic scattering of d+ 197 Au

GIUDICE, T; ABRIOLA, D; ARAZI, A; DE BARBARÁ, E; CARDONA, M A; GÓMEZ, J; HOJMAN, D; ID BETAN, R M; KOHEN, M S; LLANEZA, N; MARTÍ, G V; PAES, B; SCHNEIDER, D; SOLER, H; LUBIAN, J

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS

IOP PUBLISHING LTD

Año: 2023 vol. 50

0954-3899

Measurements of the elastic scattering angular distribution for the d+ 197Au system were carried out covering deuteron incident energies in the range from 5 to 16MeV, i.e. approximately 50% below and above the Coulomb barrier. A criticalinteraction distance of dI = 2.49 fm was determined from these distributions, whichis comparable to that of the radioactive halo nucleus 6 He. The experimental angulardistributions were systematically analyzed using two alternative models: the semi-microscopic São Paulo and the effective Woods–Saxon optical potentials, forwhich the best-fitting parameters were determined. These potentials, integratedwith the vicinity of the sensitivity radius, were calculated for each energy. For bothmodels, the energy dependence of these integrals presented the breakup thresholdanomaly around the coulomb barrier, a typical signature of weakly bound nuclei.