In-source laser spectroscopy of 75,77,78Cu: Direct evidence for a change in the quasiparticle energy sequence in 75,77Cu and an absence of longer-lived isomers in 78Cu

摘要

This paper describes measurements on the isotopes 75,77,78Cu by the technique of in-source laser spectroscopy,nat the ISOLDE facility, CERN. The role of this technique is briefly discussed in the context of this and other,nhigher resolution, methods applied to copper isotopes in the range 57−78Cu. The data, analyzed in comparisonnwith previous results on the lighter isotopes 59,63Cu, establish the ground-state nuclear spin of 75,77Cu as 5/2 andnyield their magnetic dipole moments as +1.01(5)μN and +1.61(5)μN, respectively. The results on 78Cu shownno evidence for long-lived isomerism at this mass number and are consistent with a spin in the range 3–6 andnmoment of 0.0(4) μN.