Experimental study of the 18O(d,
p)19O
reaction and the ANC Method, V. Burjan, Nuclear
Physics
Institute, Czech Academy of Sciences, Rez, Czech Republic −
The neutron
capture rate 18O(n, g)19O is important for
analysis of
nucleosynthesis in inhomogeneous Big Bang models and also for
models of helium
burningin massive
red giant stars and
AGB stars. Angular distributions of the 18O(d, p)19O
reaction were measured at a deuteron energy of16.3 MeV in NPI in Řež, Czech Republic, with the aim to
determine
Asymptotic Normalization Coefficients which can then be used for
indirect
determination of the direct contribution to the 18O(n, g)19O
process. In the experiment, the gas target with 18O
isotope of high
purity 99.9% was used thus eliminating any contaminating
reactions. Reaction
products were measured by the set of 8 dE-E telescopesconsisting of thin and
thick silicon surface-barrier
detectors. Angular
distributions of
proton transfers corresponding to 10 levels of 19O up
to the 4.1093
MeV excitation energy were determined.The
analysis of angular distributions in the angular range 6 – 64
degree including
also the angular distribution of elastically scattered deuterons
was carried
out by means of ECIS and DWBA codes. From the determined ANCs the
direct
contribution to the radiation capture 18O(n, g)19O
was
deduced.