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In this article, as an extension of our study on the angular distribution ofthe recoil flux of WIMP-scattered target nuclei, we demonstrate a possibilityof determining the mass of incident halo WIMPs by using or combining"ridge-crater" structures of the angular recoil-energy spectra with differenttarget nuclei observed in directional direct Dark Matter detection experiments.Our simulation results show that, for a WIMP mass of only a few tens GeV, thestereoscopic angular recoil-flux distributions of both of light and heavytarget nuclei would have a (longitudinally) "ridge-like" structure. However,once the WIMP mass is as heavy as a few hundreds GeV, the angular recoil-fluxdistributions of heavy target nuclei would in contrast show a (latitudinally)"crater-like" structure.

A Possibility of Determining the WIMP Mass by Using the Angular Recoil-Energy Spectra from Directional Direct Dark Matter Detection Experiments