Energy dependence of one- and two-particle transfer reactions in the system16O+90Zr

Abstract

The energy dependence of the one-and twoparticle transfer reactions 9~ 170)89Zr, 9~ 15N)9iNb and 9~ 14C)9ZMo was studied at bombarding energies of 80 MeV, 138.2 MeV and 194.4 MeV. A comparison with one-step DWBA calculations shows good agreement for the one-particle transfers over the whole energy range. For the two-proton transfer reaction (160, 14C) the discrepancies between experiment and theory are large with an exponential decrease towards higher energies. Current theories are unable to describe this behavior. PACS: 25.70.Cd; 24.50. + g IntroductionHeavy-ion induced transfer reactions have so far hardly been used as a spectroscopic tool in nuclear structure studies. Initial expectations about the possibility to study multi-particle transfer reactions inaccessible to light-ion induced reactions have not been fulfilled. Heavy-ion induced transfer reactions at energies in the vicinity of the Coulomb barrier are found to be strongly influenced by multi-step processes which are theoretically difficult to handle. The large variety of transfer reactions possible with heavy ions has therefore not yet been fully exploited.Two-particle transfer reactions present a good example. (3He, n) reactions have been studied extensively in the past [1,2], but the energy resolution available with neutron time-of-flight techniques puts severe restrictions on the usefulness of this reaction as a spectroscopic tool in studies of heavier nuclei [3]. Heavy-ion induced * Dedicated to Prof. Dr. P. Kienle on the occasion of his 60th birthday

Перерізи Пружного Розсіяння, Одержані На Основі Потенціалу Модифікованого Методу Томаса–Фермі З Урахуванням Кора

“…In the figures, the data calculated for the elastic scattering cross-section were normalized to the Rutherford cross-section values. The experimental results were taken from works [45][46][47][48]. As one can see from the figures, the elastic scattering cross-sections calculated in this work are in a good agreement with the available experimental data.…”

Fusion cross sections for 7Li + 12C system at near barrier energies

“…4 shows normalisation constant (C 2 S) obtained for one of the states (9.155 MeV, 5/2 + of 15 N) plotted as a function of E lab , similar to that in Ref. [28]. For higher energies E lab = 35 and 52.5 MeV, the data for the above mentioned state were taken from Refs.…”

“…All FRDWBA calculations were carried out including the full complex remnant term and by using post formulation. Since the spectroscopic information needed for multinucleon transfer is not unique and the spectroscopic factor is dependent on the bombarding energy [28,29], the direct reaction angular distribution calculations were normalised to the data, so that the addition of CN and direct reaction contributions explains the data. Fig.…”

Analysis of two-proton transfer in the 40Ca(18O,20Ne)38Ar reaction at 270 MeV incident energy

“…[66]. The single-particle energies have been considered to reproduce the spectrum of the 29 Si nucleus. As one clearly can realize, the orbits up to the 1d 5/2 are completely filled in this model space.…”

“…In the past, the agreement between the theoretical calculations and the experimental data was poor in the two-proton transfer reaction. Large scaling factors were needed to warrant good agreement between theory and data [22,28,29]. In Ref.…”