Study of ¹¹Be excited states via the ¹⁰Be(d,p) reaction in SOLARIS with the AT-TPC

The commissioning of using transfer reactions in inverse kinematics in SOLARIS with the Active Target Time Projection Chamber (AT-TPC) was successfully completed in the summer of 2021 at the NSCL. The goal of this experiment was to establish the possibility to perform transfer reactions at low beam intensities (typically 1-2 kHz) using the high luminosity provided by the AT-TPC. A beam of 10Be was accelerated to about 9 MeV/u in the ReA6 linac and delivered to the AT-TPC placed in a 3 Tesla magnetic field provided by the SOLARIS solenoid. The AT-TPC was filled with pure deuterium gas at 600 Torr pressure. Although multiple reaction channels were simultaneously detected, we focus on the 10Be(d,p) channel that populates bound and unbound states in 11Be, with a particular interest towards a 3.41 MeV state for which the parity is still an open question. We present the preliminary analysis for the 10Be(d,p) channel and its Q-value spectrum as well as angular distributions for various populated final states. With the ability to perform transfer reaction measurements by the AT-TPC demonstrated, many exciting prospects exist to study utilizing the rare isotope reaccelerated beams at FRIB, which just recently began its DOE mission.