Investigating the structure of the 0⁺₂ isomeric state of ¹²Be.

The ¹²Be nucleus is at a crossroad of the nuclear landscape where different phenomena such as neutron halo and disappearance of conventional magic numbers meet. This intriguing isotope has a low-lying isomeric 0⁺ state of 2.24 MeV with a lifetime of 331 ns (near the neutron separationenergy) which is a potential halo candidate. In this talk, we will present the experimental campaign to elucidate the nature of this isomeric state via elastic and inelastic scattering reactions. The development of the isomeric beam and the experiments will be conducted at ATLAS (ANL) withthe Active Target Time Projection Chamber (AT-TPC).

This work was supported by the U.S. Department of Energy, Officeof Science, Office of Nuclear Physics, under Contract Number DE-AC02-06CH11357 (ANL) and by the U.S. National Science Foundation (NSF) under Cooperative Agreement No. PHY-1565546.