摘要
The 12C+13C system has been studied extensively,because of the similarity of the entrance channel to the astrophysically important 12C+12C reaction[1??3].Until now,three different methods have been exploited to perform the fusion cross section measurements for 12C+13C under the Coulomb barrier:(1)measuring the yield of characteristic rays,(2)the total-ray yields using NaI summing detectors and(3)the activity of the reaction residue 24Na(T1=2=15.0 h).Recently,the fusion cross section of 12C+13C has been measured down to 0.9 nb through the activity measurement by our group[4].Although the statistical model calculations in all these three methods have been routinely used to convert the observed partial cross sections into the total fusion cross sections[5],the systematic uncertainty induced by the statistical corrections has not been studied very well.
