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Phys. Rev. C 78, 021303(R) (2008) [5 pages]

High-K structure in 250Fm and the deformed shell gaps at N=152 and Z=100

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P. T. Greenlees1,*, R.-D. Herzberg2, S. Ketelhut1, P. A. Butler2, P. Chowdhury3, T. Grahn1, C. Gray-Jones2, G. D. Jones2, P. Jones1, R. Julin1, S. Juutinen1, T.-L. Khoo4, M. Leino1, S. Moon2, M. Nyman1, J. Pakarinen2, P. Rahkila1, D. Rostron2, J. Sarén1, C. Scholey1, J. Sorri1, S. K. Tandel3, J. Uusitalo1, and M. Venhart5
1Department of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, Finland
2Department of Physics, University of Liverpool, Oxford Street, Liverpool L69 7ZE, United Kingdom
3Department of Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA
4Argonne National Laboratory, Argonne, Illinois 60439, USA
5Department of Nuclear Physics and Biophysics, Comenius University, 84248 Bratislava, Slovakia

Received 3 December 2007; published 11 August 2008

See accompanying Physics Synopsis

The structure of high-spin and nonyrast states of the transfermium nucleus 250Fm has been studied in detail. The isomeric nature of a two-quasiparticle excitation has been exploited in order to obtain spectroscopic data of exceptional quality. The data allow the configuration of an isomer first discovered over 30 years ago to be deduced, and provide an unambiguous determination of the location of neutron single-particle states in a very heavy nucleus. A comparison to the known two-quasiparticle structure of 254,252No confirms the existence of the deformed shell gaps at N=152 and Z=100.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.78.021303
DOI:
10.1103/PhysRevC.78.021303
PACS:
21.10.-k, 23.20.-g, 27.90.+b

*ptg@phys.jyu.fi