Phys.Rev. C 104, 044311 (2021)

C.G.Wu, for the RIBLL Collaboration

β-decay spectroscopy of the proton drip-line nucleus ²²Al

NUCLEAR REACTIONS ⁹Be(²⁸Si, X)¹⁹Ne/²⁰Na/²¹Mg/²²Al/²³Si, E=75.6 MeV/nucleon; measured reaction products and identified by TOF versus ΔE plot at the RIBLL1-HIRFL-Lanzhou facility.

RADIOACTIVITY ²²Al(β⁺), (β⁺p), (β⁺2p), (β⁺α)[from ⁹Be(²⁸Si, X), E=75.6 MeV/nucleon]; measured Eγ, Iγ, Eβ, E(p), I(p), Eα, Iα, βγ-coin, pγ-coin, αγ-coin, γγ-coin, half-life of decay of ²²Al using DSSD array for β and charged particles, and EXOGAM array for γ detection; deduced β-delayed proton and α energies and branching ratios. ²²Mg, ²¹Na, ²⁰Ne, ¹⁸Ne; deduced levels, J, π, isospin T=2 isobaric analog state (IAS) in ²²Mg and decay branching ratios by one-proton, two-protons, and α particles, I(β⁺) feedings, logft values; calculated levels, J, π, branching ratios using shell model with USDC and USDB effective interactions. Comparison between experimental results and theoretical model calculations, and with previous experimental results for delayed proton branches.

doi: 10.1103/PhysRevC.104.044311