First measurements of g factors in the even Kr isotopes


Mertzimekis TJ, Benczer-Koller N, Holden J, Jakob G, Kumbartzki G, Speidel K-H, Ernst R, Macchiavelli A, McMahan M, Phair L, et al. First measurements of g factors in the even Kr isotopes. Phys. Rev. C. 2001;64:243141–243147.


The g factors of the 2+1 and 4+1 states in 78,80,82,84,86Kr have been measured for tne first time, using Coulomb excitation of isotopic Kr beams and the transient field technique. The measured g factors of 2+1 states in 78.80.82Kr are well described, in both magnitude and progression with neutron number, by the IBA-II model. Whereas the lighter isotopes show a dominant collective structure with g factor values close to Z/A, the large g(2-1) = 1.12(14) value of 86Kr, with its closed N = 50 shell, is unequivocally dominated by specific proton configurations. The g factor of the 2+1 state in 84Kr, with two holes in the Ig9/2 neutron orbit, reflects both proton and neutron components in the wave function. In addition, the lifetimes of several 2+1 and 4+1 states were remeasured by the Doppler shift attenuation method, yielding values which, in some cases, differ from those in the literature.