engleski

Measurements

One of the most important goals of the present CRP was to improve existing experimental cross section database by performing new cross section measurements. New measurements were especially important in cases where no data previously exist or where unresolved discrepancies between already measured data needed clarification. At the beginning it was important to unify approach for measurements among CRP participants from different Laboratories in order to minimize potential mistakes during cross section measurements. When possible, thin targets were selected to avoid problems related with cross section extraction from thick target yields. Accelerator energy was calibrated using well known resonant reactions such as 27Al(p, γ)28Si at 992 keV, 19F(p, α, γ)16O at 872 keV and neutron threshold reaction such as 7Li(p, n)7Be at 1880.6 keV. All measurements were done using solid state particle detectors positioned at backward angles. For estimating the experimental uncertainty the following factors were considered: the counting statistics of peak areas, thickness of the target, current integration, detector solid angle and dead time. Uncertainties of the detector angular settings were made to be negligible. When possible, normalization to Rutherford cross sections was done in order to remove uncertainties due to dead time, improper charge collection and solid angle. The energy step for cross section measurements was adjusted according to complexity of excitation function to cover all details in it. In this Chapter all measurements done in the framework of the present CRP are summarized and given in more detail. All energies, angles and cross sections are given in the laboratory system. Performed measurements are divided according to the used ion to (p, p), (p, α), (d, d), (d, p), (d, α) and (α, α) measurements. Obtained excitation functions are given in the graphical form. Tabulated values are uploaded onto IBANDL (http://www-nds.iaea.org/ibandl/). Most of the data are published in NIM B and complete set of references is given at the end of the Chapter.

differential cross sections for least scattering ; protons ; alpha particles

nije evidentirano