Speaker
Description
In light nuclei, the quantum states formed near the cluster-separation threshold favor a large degree of cluster configurations. The $^{10}$Be is a well-known cluster nucleus, with a set of states having very large $\alpha$ widths and very small neutron strengths, consistent with the valence neutrons orbiting around the 2-$\alpha$ cores. The cluster decay branching ratios and cluster content are largely uncertain. We recently performed a $^{10}$Be+d experiment with the newly commissioned SOLARIS in AT-TPC (Active Target Time Projection Chamber) mode. The AT-TPC was filled with pure deuterium gas at 600 Torr. A cocktail beam of $^{10}$Be at 9.6 MeV/u from the ReA6 was delivered to the AT-TPC placed inside the SOLARIS solenoid energized at 3T. Charged particles emitted from multiple reaction channels (d,p), (d,d'), (d,t), (d,$^3$He), (d,$\alpha$) were identified with their magnetic rigidity and energy-loss profiles. The 7.54-MeV 2$^+$ resonance state in inelastically scattered $^{10}$Be is observed, which is just 0.133 MeV above the alpha-decay threshold. The decay of inelastically scattered $^{10}$Be$^*\rightarrow$$^6$He+$^4$He allows us to determine the competition with neutron decay. The 7.54-MeV state could belong to a rotational band built on the below threshold 0$_2 ^+$ at 6.18 MeV as bandhead. Preliminary results from the data analysis will be presented.
