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Phys. Rev. C 61, 044310 (2000) [7 pages]

Prolate yrast cascade in 183Tl

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W. Reviol1, M. P. Carpenter2, R. V. F. Janssens2, D. Jenkins3, K. S. Toth4, C. R. Bingham1,4, L. L. Riedinger1, W. Weintraub1, J. A. Cizewski2,5, T. Lauritsen2, D. Seweryniak2, J. Uusitalo2, I. Wiedenhöver2, R. Wadsworth3, A. N. Wilson3, C. J. Gross4,6, J. C. Batchelder6, K. Helariutta7, and S. Juutinen7
1Department of Physics, University of Tennessee, Knoxville, Tennessee 37996
2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
3Department of Physics, University of York, Heslington, York YO1 5DD, United Kingdom
4Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
5Department of Physics, Rutgers University, New Brunswick, New Jersey 08903
6Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831
7Department of Physics, University of Jyväskylä, 40351 Jyväskylä, Finland

Received 24 August 1999; published 3 March 2000

The yrast sequence in 183Tl has been studied for the first time in recoil-mass selected γ-ray spectroscopic measurements. A rotational-like cascade of seven transitions is established down to the band head with probable spin and parity (13/2+). Unlike in the adjacent odd-mass Tl nuclei, prompt γ decay from the yrast band to a lower lying weakly deformed (oblate) structure is not observed. These features are consistent with the predicted drop of the prolate band head in 183Tl compared to 185Tl. The implications for the prolate energy minimum in odd-mass Tl nuclei at the neutron i13/2 midshell (N=103) are discussed.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.61.044310
DOI:
10.1103/PhysRevC.61.044310
PACS:
27.60.+j, 23.20.Lv, 21.60.Cs
 
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