Spin-alignment and g-factor measurement of the $I^{\pi}$ = 12+ isomer in 192Pb produced in the relativistic-energy fragmentation of a 238U beam.

The feasibility of measuring g -factors using the TDPAD method applied to high-energy, heavy fragmentation products is explored. The 2623keV $\ensuremath I^{\pi}=12^+$ isomer in ¹⁹²Pb with $ \tau$ = 1.57 μs has been produced using the fragmentation of a 1 A 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, $ \tau$ = 1.54(9) μs, and the g -factor, g = - 0.175(20) , agree with the results of previous investigations using fusion-evaporation reactions. [ABSTRACT FROM AUTHOR]