Coulomb-nuclear interference (CNI) results of the collective quadrupolar excitations in odd and even Ru isotopes

Abstract

The study of the odd 99,101 Ru nuclei complements the investigation of the collectivity of the first quadrupolar excitations in 100,102,104 Ru. Angular distributions for the 99,101 Ru(d, d ) reactions at 13 MeV were obtained in the Pelletron Laboratory using nuclear emulsion plates on the focal plane of the Enge spectrograph. A CoulombNuclar Interference analysis employing DWBA-DOMP predictions with global optical potential parameters was applied to the excitation of states which could belong to the multiplet built on the first quadrupolar excitation of the core. In the analysis, three states were identified for each of the isotopes and associated, respectively, with adopted levels in the Nuclear Data Sheets Compilation of J π = 5/2 + , 7/2 + and 9/2 + . Through the comparison of experimental and predicted cross section angular distributions, the values of (δ N L ) 2 and of the ratio C = δ C L /δ N L were obtained.