Abstract
The main purpose of the present work is the investigation of the α-cluster phenomenon in 16 O. The 12 C( 6 Li,d) 16 O reaction was measured at a bombarding energy of 25.5 MeV employing the Sao Paulo Pelletron-Enge-Spectrograph facility and the nuclear emulsion detection technique. Resonant states around 4α threshold were measured and an energy resolution of 15 keV allows to define states previously unresolved. The angular distributions of the absolute cross sections were determined in a range of 4-40 degree in the center of mass system. The upper limit for the resonance widths was obtained, indicating that the α cluster structure information in this region should be revised.
Highlights
The cluster phenomenon in the structure of light nuclei has been the subject of a longtime investigation since the proposal of the Ikeda diagrams [1], the mechanism of the cluster formation is still not completely understood
Several narrow resonances with a quasi-bound behavior embedded in the continuum are observed in the measured spectra and an energy resolution of 15 keV allows for the separation of doublets not resolved before
The upper limit for the resonance widths obtained is near the energy resolution
Summary
The cluster phenomenon in the structure of light nuclei has been the subject of a longtime investigation since the proposal of the Ikeda diagrams [1], the mechanism of the cluster formation is still not completely understood. The main purpose of the research program in progress is the investigation of this phenomenon in (x ) and (x + n) nuclei through (6Li, d) transfer reactions performed in São Paulo [4,5]. A rotational band with the + 12C(Hoyle) cluster state structure was calculated by Ohkubo and Hirabayashi [2]. In order to explore this region the 12C(6Li,d)16O reaction was measured at a bombarding energy of 25.5 MeV employing the São Paulo Pelletron-EngeSpectrograph facility and the nuclear emulsion detection technique
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