Impact of profile effects on yield ratios from shock driven inertial confinement fusion implosions

The S-factor for reactions between two deuterons (DD) has been successfully measured (relative to DT) in both compressive [1] and shock-driven inertial confinement fusion (ICF) implosions. In contrast, measuring the D³He S-factor (relative to DD) has generated contradictory results for compressive [2] and shock-driven implosions, with ICF-inferred D³He S-factors spanning the range from lower than expected for lower-temperature compressive implosions to much higher than expected for hotter shock-driven implosions. This impacts the feasibility of using the D³He-implosion platform for bound and/or plasma screening studies as well as for implosion-based nuclear astrophysics studies in general, and needs to be understood. Comparison to radiation hydrodynamic simulations suggests that the high temperature results might be explained by considering the effects of spatial gradients in temperature and density, i.e., profile effects. This poster will discuss these results along with ratios of multiple different reactions from implosions with DT³He gas fill, considering paths forward for S-factor measurements from ICF implosions with ³He in the fill gas.