Determining the average prompt-fission-neutron multiplicity for 239 Pu ( n , f ) via a 240 Pu ( α , α ′ f ) surrogate reaction

B. S. Wang, ∗ J. T. Burke, O. A. Akindele, 2 R. J. Casperson, R. O. Hughes, J. D. Koglin, K. Kolos, E. B. Norman, 1 S. Ota, and A. Saastamoinen Lawrence Livermore National Laboratory, Livermore, California 94550, USA Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA Cyclotron Institute, Texas A&M University, College Station, Texas 77840, USA (Dated: June 5, 2021)