The feasibility of measuring g -factors using the TDPAD method applied to high-energy, heavy fragmentation products is explored. The 2623keV isomer in 192Pb with = 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, = 1.54(9) μs, and the g -factor, g = - 0.175(20) , agree with the results of previous investigations using fusion-evaporation reactions.
Spin-alignment and g-factor measurement of the Ipi= 12+ isomer in 192Pb produced in the relativistic-energy fragmentation of a 238U beam / M. Kmiecik, A. Maj, J. Gerl, G. Neyens, L. Atanasova, D.L. Balabanski, F. Becker, P. Bednarczyk, G. Benzoni, N. Blasi, A. Bracco, S. Brambilla, L. Caceres, F. Camera, M. Ciemala, F.C.L. Crespi, S.K. Chamoli, S. Chmel, J.M. Daugas, P. Detistov, P. Doornenbal, G. Georgiev, K. Gladnishki, M. Gorska, H. Grawe, J. Grebosz, M. Hass, R. Hoischen, G. Ilie, M. Ionescu-Bujor, J. Jolie, I. Kojuharov, A. Krasznahorkay, R. Kulessa,M. Lach, S. Lakshmi, S. Leoni, G. Lo Bianco, R. Lozeva, K.H. Maier, S. Mallion, K. Mazurek, W. Meczynski, B. Million, D. Montanari, S. Myalski, C. Petrache, M. Pfutzner, S. Pietri, Zs. Podolyak, W. Prokopowicz, D. Rudolph, N. Saito, T.R. Saito, A. Saltarelli, G.S. Simpson, J. Styczen, N. Vermeulen, E. Werner-Malento, O. Wieland, H.J. Wollersheim, M. Zieblinski. - In: THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI. - ISSN 1434-6001. - 45:2(2010), pp. 153-158. [10.1140/epja/i2010-11003-4]
Spin-alignment and g-factor measurement of the Ipi= 12+ isomer in 192Pb produced in the relativistic-energy fragmentation of a 238U beam
A. Bracco;F. Camera;F.C.L. Crespi;S. Leoni;D. Montanari;
2010
Abstract
The feasibility of measuring g -factors using the TDPAD method applied to high-energy, heavy fragmentation products is explored. The 2623keV isomer in 192Pb with = 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, = 1.54(9) μs, and the g -factor, g = - 0.175(20) , agree with the results of previous investigations using fusion-evaporation reactions.
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