Structure of ¹³Be studied through the ¹²Be(d,p)¹³Be reaction

The low-lying structure of ¹³Be has remained an enigma for decades. Despite numerous experimental and theoretical studies, inconsistencies remain. Being both unbound and one neutron away from ¹⁴Be, the heaviest bound beryllium nucleus, ¹³Be is difficult to study through simple reactions with weak radioactive-ion beams or more complex reactions with stable-ion beams. Data from a study of ¹³Be using the ¹²Be(d,p)¹³Be reaction in inverse kinematics using a 9.5 MeV per nucleon ¹²Be beam from the ISAC-II facility will be presented. The solid deuteron target of IRIS was used to achieve an increased areal thickness and reduced background compared to conventional deuterated polyethylene targets. The Q-value spectrum below −4.4 MeV was analyzed using a Bayesian method with GEANT4 simulations. Two possible scenarios to explain the strength below 1 MeV above the neutron separation energy are proposed. Comparisons of the Q-value spectrum with GEANT4 simulations obtained using the energies and widths of states reported in four previous works will be presented.