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HK: Fachverband Hadronen und Kerne

HK 37: Nuclear Structure and Dynamics II

HK 37.8: Vortrag

Dienstag, 17. März 2009, 18:45–19:00, H-ZO 50

the 12C(16O,γ)28Si reaction: structural and statistical aspects of the gamma decay — •dorothee lebhertz¹, sandrine courtin¹, florent haas¹, david jenkins², and david hutcheon³ — ¹IPHC, University of Strasbourg, CNRS, Strasbourg, France — ²Department of Physics, University of York, York, UK — ³TRIUMF, Vancouver, Canada

The 28Si nucleus is a microlaboratory where oblate, prolate and octupole shapes coexist at low excitation energies. At higher excitations, a 12C-16O cluster band has been observed in breakup experiments for which the band head should lie around 25 MeV. It is also around this energy that narrow (Γ around 200 keV) resonances were found in the radiative capture reaction to the 0+ and 2+ members of the g.s. band. The radiative capture is a powerful tool to study the interplay between reaction mechanisms and structural effects. The aim of our recent experiment performed at Triumf using the highly selective Dragon 0° spectrometer and its associated BGO array was to measure the complete γ-decay of the radiative capture 12C(16O,γ)28Si reaction. For the first time, we observed important feeding of doorway states around 11 MeV and also direct decay to the 3- octupole state at 6.9 MeV and to the 4+ member of the prolate band at 9.2 MeV. Results of this experimental programme will be presented, discussed in terms of an interplay between statistical and structural effects in 28Si and compared to similar results in the 12C+12C system.