First detection and energy measurement of recoil ions following beta decay in a Penning trap with the WITCH experiment

First direct lifetime measurement of the 2+1 state in 72,74Zn: new evidence for shape transition between N = 40 and N = 42 close to Z = 28

First direct mass-measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He

First Direct Measurement of Jets in $\sqrt{s_{NN}}=200$ GeV Heavy Ion Collisions by STAR

First direct measurement of resonance strengths in 17O(α, γ)21Ne

First direct measurement of the total cross section of 12C(alpha,gamma)16O

First direct observation of two protons in the decay of $^{45}$Fe with a TPC

First Energy and Angle differential Measurements of e^+e^- -pairs emitted by Internal Pair Conversion of excited Heavy Nuclei

First evidence for different freeze-out conditions for kaons and antikaons observed in heavy-ion collisions

First exclusive measurements of the K^-pp state - populated in the pp to K^+ Lambda p reaction at 2.85 GeV

First experiment on fission transients in highly fissile spherical nuclei produced by fragmentation of radioactive beams

First experimental determination of the charge radius of $^{74}$Rb and its application in tests of the unitarity of the CKM matrix

First experimental results on creation and decay of eta-mesic nuclei

First fragmentation function measurements from full jet reconstruction in heavy-ion collisions at $\sqrt{s_{_{\rm NN}}}=200$ GeV by STAR

First Hints of Jet Quenching at RHIC

First identification of large electric monopole strength in well-deformed rare earth nuclei

First Measurement of Antikaon Phase-Space Distributions in Nucleus-Nucleus Collisions at Subthreshold Beam Energies

First Measurement of A_N at sqrt(s)=200 GeV in Polarized Proton-Proton Elastic Scattering at RHIC

First Measurement of Beam-Recoil Observables Cx and Cz in Hyperon Photoproduction

First measurement of coherent $φ$-meson photoproduction on deuteron at low energies