Mutual inelastic scattering in theO16+O

Abstract

Excitation functions for the total cross section in various mutual excitation channels have been measured in the ' 0 + ' 0 system using a y-y coincidence technique in the energy range E, = 24 -41 MeV. The inclusive cross section for the production of 6.13MeV y rays has also been measured using a Ge(Li) detector. Gross structure oscillations are seen in the mutual excitation of the second excited (J = 3 ) state; these oscillations are approximately in phase with those of the single excitation cross section, which has also been extracted from the present data using the combined results of coincidence and singles measurements.The general trend of the data is accounted for by recently published coupled channels calculations, although a detailed fit is not achieved. NUCLEAR REACTIONS ' 0(' 0' 0*)' 0* E, = 24 -41 MeV; measured y-y coincidences; deduced reaction mechanism.

Heavy-Ion Resonance and Multi-Cluster Structure of Nuclei

“…For lightest 4n nuclei (with A=2Z=2N =4n with n=1, 2, 3, ...) up to 20 Ne, most of these cluster structures were identified to exist by experimental and theoretical studies, 2) except for 4α and 5α structures in 16 O and 20 Ne, respectively. For nuclei heavier 52 Y. Sakuragi than 24 Mg, no clear evidence of cluster structures was obtained, except for some theoretical predictions on the 2α+ 16 O and α+ 20 Ne structures in low-lying excited states of 24 Mg. Ikeda diagram also predicts the existence of di-nucleus type structures, such as 12 C+ 12 C, 12 C+ 16 O and 16 O+ 16 O configurations in highly-excited regions in 24 Mg, 28 Si and 32 S nuclei, respectively. This type of structure is called di-nuclear molecular structure on the analogy of di-atomic molecules.…”

“…However, there still remains a quite large veiled area in Ikeda diagram (Fig. 1) where various kind of molecular structures, particularly those having multi-cluster configurations, are expected to exist in highexcitation energy region of 24 Mg, 28 Si and 32 S nuclei.…”

Distorted wave approach to heavy ion molecular resonance

“…Here we replace the distorting potentials into the Woods-Saxon potentials and replace the resulting coupling interaction, (V+AV), into (11). For the elastic distorting potentials we have taken the optical potentials which fit the elastic excitation functions: The Maher-type potential [24] has been used for 12C+ 12C [25], the Reilly-type potential [22] for 14C+14C [26] and Maher's potential [27] for 160+ 160 [28]. (The "direct" process is now equal to zero in the coupling interaction of (11).)…”