Pionic Fusion Studies of a = 6 Halo Nuclei

The halo nucleus ⁶He and its isobaric analogue state, at 3.56 MeV excitation energy, in ⁶Li are investigated in a series of pionic fusion experiments at the CELSIUS storage ring facility in Uppsala. The ⁴He(d, ⁶He)π⁺ reaction was studied 0.6-5.4 MeV above threshold in the centre-of-mass frame with a deuteron beam incident on a ⁴He gas target. The ⁶He ions were detected in a ΔE-E solid-state detector telescope inserted into the CELSIUS ring. Preliminary results are presented and compared to results for the analogue reaction producing ⁶ Li_3.56^*.