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High-K structure in Fm250 and the deformed shell gaps at N=152 and Z=100

P. T. Greenlees, R.-D. Herzberg, S. Ketelhut, P. A. Butler, P. Chowdhury, T. Grahn, C. Gray-Jones, G. D. Jones, P. Jones, R. Julin, S. Juutinen, T.-L. Khoo, M. Leino, S. Moon, M. Nyman, J. Pakarinen, P. Rahkila, D. Rostron, J. Sarén, C. Scholey, J. Sorri, S. K. Tandel, J. Uusitalo, and M. Venhart
Phys. Rev. C 78, 021303(R) – Published 11 August 2008
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Abstract

The structure of high-spin and nonyrast states of the transfermium nucleus Fm250 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 No254,252 confirms the existence of the deformed shell gaps at N=152 and Z=100.

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  • Received 3 December 2007

DOI:https://doi.org/10.1103/PhysRevC.78.021303

©2008 American Physical Society

Synopsis

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Weighty matters

Published 18 August 2008

The long-held belief that nuclear states of very heavy elements that carry a large angular momentum would be unstable has been shattered in recent years. Now, a new experiment that can probe the outermost nuclear orbitals in 250Fm studies these states and poses a challenge to theory.

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Authors & Affiliations

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

  • *ptg@phys.jyu.fi

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Issue

Vol. 78, Iss. 2 — August 2008

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