Self-generation of toroidal magnetic flux and particle acceleration during a reconnection event are two of the main characteristics of the reversed field pinch (RFP) configuration. However, direct experimental observations that explicitly identify the precise location where the effects of reconnection events are strongly manifested in deep-reversal discharges are lacking. This paper presents the first experimental observation of a distinct hollow soft x-ray (SXR) emissivity distribution in the deep-reversal discharge () of the low-aspect-ratio (low-) RFP device RFP of low-aspect-ratio experiment. Using a high-speed SXR imaging system, we successfully captured the rapid dynamics of the internal plasma structure during an oscillation event. Detailed profile analysis and equilibrium reconstruction estimations confirm that the observed hollow SXR emission is confirmed to be highly localized in the vicinity of the resonant surface, which is the reversal surface (at a normalized radius of ). The SXR intensity synchronizes with the plasma current oscillation, peaking approximately in synchronization with the onset of the rapid drop phase of the oscillation cycle. Analysis of the magnetohydrodynamic (MHD) mode activity suggests that the generation of this hollow emissivity structure is associated with particle acceleration resulting from magnetic reconnection, which is associated with the dynamo effect. While the potential contribution of impurity radiation cannot be entirely excluded based on visible light spectroscopy, the synchronization with magnetic fluctuations indicates that the dynamo effect plays a primary role. The findings of this study provide valuable insights into the nonlinear MHD dynamics in RFP plasmas and the formation of a localized poloidal current sheet.