EURORIB 2010

Study of the β-delayed particle emission of 17Ne

Not scheduled

1m

Village de Vacances de Lamoura

Board: 1

poster At and beyond the dripline

Speaker

Mr Ricardo Domínguez-Reyes (IEM, CSIC, Madrid, Spain)

Description

Beta delayed particle emission provides a very useful way of studying nuclear structure near the drip lines. With this aim we have performed and experiment at ISOLDE to investigate the β-delayed proton and alpha emitter 17Ne, the lightest bound neon isotope. We wanted to study the β-delayed proton decay branches and in particular those unstable to α decay. One of the main interests on 17Ne is the population by β-delayed proton decay of states in 16O of astrophysical importance. The width of the 7.117 and 6.917 MeV states in 16O affects the strength of the E1 and E2 components of the capture reaction 12C(α,γ)16O of the CNO cycle after the triple-α process. The ratio of these two processes determines the amount of 12C and 16O after helium burning, which in turn influences the amount of heavier nuclei that are created starting from each of these two. To achieve a better understanding of that process, we have studied the β-delayed charged particles channels using ISOLDE's Si-Ball along with a DSSSD+Si-PAD. The Time-of-Flight technique and telescope event selection were used to separate the proton and alpha channels in order to obtain branching ratios and β feeding to the levels of interest. We have investigated the particle coincidence channels (βpα and βαp). Furthermore we have performed advanced R-Matrix fits to the data in order to reproduce the shape of the spectrum including interference. We have been able to determine the spin-parity and widths of most of the levels relevant to the particle emission process from the excited states of 17F.