Kay, B. P.Alcorta, M.Back, B. B.Baker, S. I.Bedoor, S.Bloxham, T.Clark, J. A.Deibel, C. M.Freeman, S. J.Hoffman, C. R.Howard, A. M.Lighthall, J. C.Marley, S. T.Mitchell, A. J.Rehm, K. E.Schiffer, J. P.Sharp, D. K.Shetty, D. V.Thomas, J. S.Wuosmaa, A. H.Zhu, S.2026-01-012026-01-011742-6588ORCID:/0000-0002-6742-695X/work/160804334https://hdl.handle.net/1885/733799004The helical orbit spectrometer, HELIOS, at Argonne National Laboratory has been developed to measure transfer reactions in inverse kinematics with good Q-value resolution. The technique is discussed alongside examples of measurements with medium-mass beams, the first exploration of reactions in the the forward hemisphere, and a future outlook.en201210.1088/1742-6596/381/1/01209584867946505