Spin-alignment and g-factor measurement of the Iπ = 12+ isomer in 192Pb produced in the relativistic-energy fragmentation of a 238U beam

Abstract

The feasibility of measuring g -factors using the TDPAD method applied to high-energy, heavy fragmentation products is explored. The 2623 keV Iπ = 12+ isomer in 192Pb with τ = 1.57 μs has been produced using the fragmentation of a 1A GeV 238U beam. The results presented demonstrate for the first time that such heavy nuclei produced in a fragmentation reaction with a relativistic beam are sufficiently well spin-aligned. Moreover, the rather large value of the alignment, 28(10)% of the maximum possible, is preserved during the separation process allowing the determination of magnetic moments. The measured values of the lifetime, τ = 1.54(9) μs, and the g-factor, g = -0.175(20), agree with the results of previous investigations using fusion-evaporation reactions. © 2010 SIF, Springer-Verlag Berlin Heidelberg.