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

: Chmel, S. et al.


The European physical journal. A, Hadrons and nuclei 45 (2010), No.2, pp.153-158
ISSN: 1434-6001
ISSN: 1434-601X
ISSN: 1431-5831
Journal Article
Fraunhofer INT ()

The feasibility of measuring g-factors using the TDPAD method applied to high-energy, heavy fragmentation products is explored. The 2623 keV I-pi = 12(+) isomer in Pb-192 with tau = 1.57 mu s has been produced using the fragmentation of a 1 A GeV U-238 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) mu s, and the g-factor, g = -0.175(20), agree with the results of previous investigations using fusion-evaporation reactions.