A team at UC Berkeley has built a new online database called BEαpR (Berkeley Evaluated Alpha and proton Radioactivity). It collects experimental information on every known beta-plus (β+) delayed and direct heavy-particle emitter — meaning nuclei that emit protons (p), alpha particles (α), larger clusters, or undergo fission — wherever those decays are energetically possible.

The database lists concrete measured quantities for each nucleus. That includes branching ratios (how often a given decay channel happens), half-lives, the Q-values (the energy released), and particle-separation energies. For nuclei with measured discrete proton or alpha transitions it also gives the emitted-particle energies, intensities, and the initial and final nuclear states. Each entry includes a graphical sketch of major decay modes and a list of experimental references.

BEαpR is organized by isospin projection Tz (a simple way to group nuclei with similar neutron-to-proton imbalance; Tz = (N − Z)/2) and split into even and odd proton-number (Z) datasets. The current compilation covers Tz from −4 to +31 and spans the full Segrè chart from lithium (Z = 3) to oganesson (Z = 118). The authors report 1,251 nuclei so far. Long-lived isomers (excited nuclear states with half-life > 10 ns) are treated separately; very short-lived high-energy states are not included.

The authors say BEαpR is meant to be a practical, up-to-date resource for both experimentalists and theorists. Experimentalists can use it to check new measurements and spot poorly known decays. Theorists can pull systematic trends for testing models and for inputs to astrophysical-rate calculations. The paper contrasts BEαpR with older resources such as ENSDF and NuDat, noting that some exotic decay modes are missing or out of date in those databases. Two concrete examples given are the proton-rich nucleus 22Si, where new papers changed the picture since ENSDF’s last update, and 178Au, where newer measurements revised the reported alpha-branching ratio.