DREB Conference 2024

The deuteron elastic and inelastic scattering reactions of ${}^{10}$Be have been measured with the AT-TPC coupling with SOLARIS in inverse kinematics. The deformation length of the excited states in ${}^{10}$Be below 9 MeV has been inferred from the differential cross sections with the CCBA calculation. A new $1^{-}$ state at 7.27(10) MeV, located just near the $\alpha$-emission threshold, has been observed for the first time. It exhausts a large fraction of the isoscalar dipole energy-weighted sum rule, and has isoscalar characteristics, suggesting a strong $\alpha$ cluster structure in ${}^{10}$Be. The Gamow Coupled Channel approach supports this interpretation and suggests the near-threshold effect might be playing a role in this excitation energy domain. The $2\alpha +2n$ four-body calculation also support this picture and could reasonably reproduce the large E1 strength observed.

This material is based upon work supported by NSF’s National Superconducting Cyclotron Laboratory which is a major facility fully funded by the National Science Foundation under award PHY-1565546; the U.S.\ Department of Energy, Office of Science, Office of Nuclear Physics, under Contract Number DE-AC02-06CH11357 (Argonne). SOLARIS is funded by the DOE Office of Science under the FRIB Cooperative Agreement DE-SC0000661.