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Phys. Rev. C 75, 014309 (2007) [6 pages]

Isospin purity of T=1 states in the A=38 nuclei studied via lifetime measurements in 38K

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F. M. Prados Estévez1, A. M. Bruce1, M. J. Taylor1,*, H. Amro2,†, C. W. Beausang2,‡, R. F. Casten2, J. J. Ressler2, C. J. Barton3,*, C. Chandler4, and G. Hammond4,*
1School of Engineering, University of Brighton, Brighton BN2 4GJ, United Kingdom
2Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA
3CLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
4School of Chemistry and Physics, Keele University, Staffordshire ST5 5BG, United Kingdom

Received 10 October 2006; published 16 January 2007

The Doppler Shift Attenuation Method was used to measure lifetimes for levels in 38K at excitation energies of 1698, 2404, 2830, 2996, and 3671 keV, populated using the 40Ca(d, α)38K reaction at a beam energy of 4.5 MeV. Values of 109(29), 95(22), 457(63), 130(40), and 160(50) fs, respectively, were measured and are compared with previous values obtained using different stopping powers. The matrix element for the transition between the Jπ=2T=1+ and 0T=1+ states in this Tz=0 nucleus is compared with the analogous transition in the other nuclei in the T=1 triplet, 38Ca (Tz=-1) and 38Ar (Tz=+1), and with the results of shell-model calculations.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.75.014309
DOI:
10.1103/PhysRevC.75.014309
PACS:
21.10.Tg, 21.60.Cs, 23.20.Js

*Current address: Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom.

†Current address: Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA.

‡Current address: Department of Physics, University of Richmond, Richmond, VA 23173, USA.

 
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