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.
| Is this an invited talk? (please answer yes or no) | No |
|---|---|
| Would you prefer your contribution to be an oral presentation? (please answer yes or no) | Yes |
| Would you prefer your contribution to be a poster presentation? (please answer yes or no) | No |
Primary author
Mr
Ricardo Domínguez-Reyes
(IEM, CSIC, Madrid, Spain)
Co-authors
A. Jokinen
(Helsinki Institute of Physics, FIN-40014, University of Jyväskyla, Finland)
A. Saastamoinen
(Department of Physics, FIN-40014, University of Jyväskyla, Finland)
B. Jonson
(Department of Physics, Chlamers Univ. of Technology, S-41296 Göteborg, Sweden)
G. Nyman
(Department of Physics, Chlamers Univ. of Technology, S-41296 Göteborg, Sweden)
H. Jepessen
(Institut for Fysik og Astronomi, Aarhus, Denmark)
H. O. U. Fynbo
(Institut for Fysik og Astronomi, Aarhus, Denmark)
J. López Herraiz
(Grupo de Física Nuclear, Universidad Complutense, Madrid, Spain)
J. M. Udías
(Grupo de Física Nuclear, Universidad Complutense, Madrid, Spain)
J. Äystö
(Department of Physics, FIN-40014, University of Jyväskyla, Finland)
K. Riisager
(Institut for Fysik og Astronomi, Aarhus, Denmark)
L. M. Fraile
(Grupo de Física Nuclear, Universidad Complutense, Madrid, Spain)
M. J. G. Borge
(IEM, CSIC, Madrid, Spain)
O. Kirsebom
(Institut for Fysik og Astronomi, Aarhus, Denmark)
O. Tengblad
(IEM, CSIC, Madrid, Spain)
R. Schueber
(Ludwig-Maximilians-Universität München, Munich, Germany)
S. España Palomares
(Grupo de Física Nuclear, Universidad Complutense, Madrid, Spain)
T. Nilsson
(EP Division, CERN, CH-1211, Geneva, Switzerland)
