First measurement of kaonic helium-3 X-rays

First Measurement of Proton-Proton Elastic Scattering at RHIC

First measurement of target and double spin asymmetries for polarized e- polarized p --> e p pi0 in the nucleon resonance region above the Delta(1232)

First measurement of the 14N(p,gamma)15O cross section down to 70 keV

First measurement of the circular beam asymmetry in the gamma p --> pi0 eta p reaction

First Measurement of the He3+He3-->He4+2p Cross Section down to the Lower Edge of the Solar Gamow Peak

First Measurement of the J/psi Azimuthal Anisotropy in PHENIX at Forward Rapidity in Au+Au Collisions at sqrt s(NN) = 200 GeV

First Measurement of the Neutron $β$-Asymmetry with Ultracold Neutrons

First measurement of the partial widths of $^{209}$Bi decay to the ground and to the first excited states

First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions

First measurement of the rho spectral function in nuclear collisions

First measurement of the rho spectral function in nuclear collisions

First measurement of the spectral function at high energy and momentum in medium-heavy nuclei

First measurement of the strange particles Rcp nuclear modification factors in heavy-ion collisions at the SPS

First Measurements of Pion Correlations by the PHENIX Experiment

First measurements of the ^16O(e,e'pn)^14N reaction

First observation of 54Zn and its decay by two-proton emission

First observation of 55,56Zn

First observation of alpha decay of 190-Pt to the first excited level (E_{exc}=137.2 keV) of 186-Os

First observation of excited states in 173Hg93