First Study of the 139Ba(𝑛,𝛾)140Ba Reaction to Constrain the Conditions for the Astrophysical 𝑖 Process by Spyrou, A. Mücher, D. Denissenkov, P. A. Herwig, F. Good, E. C. Balk, G. Berg, H. C. Bleuel, D. L. Clark, J. A. Dembski, C. DeYoung, P. A. Greaves, B. Guttormsen, M. Harris, C. Larsen, A. C. Liddick, S. N. Lyons, S. Markova, M. Mogannam, M. J. Nikas, S. Owens-Fryar, J. Palmisano-Kyle, A. Perdikakis, G. Pogliano, F. Quintieri, M. Richard, A. L. Santiago-Gonzalez, D. Savard, G. Smith, M. K. Sweet, A. Tsantiri, A. Wiedeking, M.