Collective enhancement in the exciton model

M. Mumpower, D. Neudecker, H. Sasaki, T. Kawano, A. Lovell, M. W. Herman, I. Stetcu, M. Dupuis

Published PRC 107 034606 (2023)

The pre-equilibrium reaction mechanism is considered in the context of the exciton model. A modification to the one-particle one-hole state density is studied which can be interpreted as a collective enhancement. The magnitude of the collective enhancement is set by simulating the Lawrence Livermore National Laboratory (LLNL) pulsed-spheres neutron-leakage spectra. The impact of the collective enhancement is explored in the context of the highly deformed actinide, $^{239}$Pu. A consequence of this enhancement is the removal of fictitious levels in the Distorted-Wave Born Approximation often used in modern nuclear reaction codes.



nuclear theory

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