Improved DSAM measurements in $^{10}$Be as a test of Ab-Initio calculations

Recent ab-initio calculations in light nuclei have emphasized the significance of 3-body forces. In the A = 10 systems, the inclusion of 3-body forces inverts the sequence of states, which has been attributed to the important contribution of the 3-body interaction to the overall spin orbit force. To challenge these latest calculations, a new generation of improved DSAM measurements is necessary to precisely ($<$5{\%}) determine matrix elements between excited states. Lifetimes of excited levels in $^{10}$Be, populated in the $^{7}$Li($^{7}$Li,$\alpha )$ reaction, are determined using high velocity DSAM measurements. The recoiling $^{10}$Be were detected at zero degrees using the Argonne Fragment Mass Analyzer (FMA) and $\gamma $ rays measured with Gammasphere, the combination allowing for the collection of very clean $\gamma $-ray spectra and the elimination of cascade feeding. Preliminary results of the experiment will be presented and discussed in terms of recent ab-initio calculations. This research is supported by the DOE Office of Nuclear Physics under contract DE-AC02-06CH11357.