The structure of ⁹C is poorly known. Only a few excited states have been observed and little information exists on their single-particle proper-ties. These data are vital to test ab initio nuclear theories which have ex-celled in modeling light nuclear systems in the p-and sd-shells. To probe the structure of ⁹C the ¹⁰C(d,t)⁹C reaction was performed in inverse kinemat-ics at the ATLAS facility at Argonne National Laboratory. An “in-flight” radioactive ¹⁰C beam was developed at ATLAS through the p(¹⁰B,¹⁰C)n reaction using a 185-MeV ¹⁰B beam incident on a cryogenic hydrogen gas cell. The resulting 171-MeV ¹⁰C beam had an average intensity of 2.2x104 pps and bombarded a 660 µg/cm² deuterated polyethylene (CD²)n target. Tritons were detected and identified in an array of annular double-sided silicon detectors covering q_lab between 8 and 42 degrees. Heavy beam-like recoils were detected in a set of forward-angle silicon detectors in a DE-E configuration. The results from the Distorted Wave Born Approximation (DWBA) analysis performed for the ground state transition are compared to those from ab initio (GFMC/VMC) calculations. Results on transfer to the proton-unbound excited states of ⁹C will also be presented.

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