https://doi.org/10.1140/epja/i2010-11003-4
Regular Article - Experimental Physics
Spin-alignment and g-factor measurement of the
= 12+ isomer in 192Pb produced in the relativistic-energy fragmentation of a 238U beam
1
H. Niewodniczański Institute of Nuclear Physics PAN, ul. Radzikowskiego 152, 31-342, Kraków, Poland
2
GSI, Planckstrasse 1, D-64291, Darmstadt, Germany
3
K.U. Leuven, Instituut voor Kern- en Stralingsfysica, B-3001, Leuven, Belgium
4
Faculty of Physics, University of Sofia “St. Kl. Ohridski”, BG-1164, Sofia, Bulgaria
5
Dipartamento di Fisica, Università degli Studi di Camerino and INFN sez. Perugia, I-62032, Camerino, Italy
6
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784, Sofia, Bulgaria
7
INFN Sez. di Milano, Via Celoria 16, 20133, Milano, Italy
8
Università degli Studi di Milano, I-20133, Milano, Italy
9
Weizman Institute of Science, 76100, Rehovot, Israel
10
Fraunhofer INT, D 53879, Euskirchen, Germany
11
CEA, DAM, DIF, F-91297, Arpajon Cedex, France
12
CSNSM, Université Paris-Sud 11, CNRS/IN2P3, F-91405, Orsay-Campus, France
13
Department of Physics, Lund University, S-22100, Lund, Sweden
14
Institut für Kernphysik, Universität zu Köln, D-50937, Köln, Germany
15
National Institute for Physics and Nuclear Engineering, RO-76900, Bucharest, Romania
16
Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Debrecen, Hungary
17
Jagiellonian University, Kraków, Poland
18
University of Warsaw, PL-00681, Warsaw, Poland
19
Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
20
Institut Laue Langevin, Grenoble, France
21
Institute of Physics PAN, Warsaw, Poland
* e-mail: maria.kmiecik@ifj.edu.pl
Received:
30
December
2009
Revised:
27
April
2010
Accepted:
11
June
2010
Published online:
8
July
2010
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.
© SIF, Springer-Verlag Berlin Heidelberg, 2010