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 = 2+ T=1 and 0+ T=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.
Copyright © 2007 The American Physical Society. This article first appeared in Physical Review C 75, no. 1 (January 16, 2007): 014309:1-14309:6. doi:10.1103/PhysRevC.75.014309
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Prados Estévez, F., A. Bruce, M. Taylor, H. Amro, C. Beausang, R. Casten, J. Ressler, C. Barton, C. Chandler, and G. Hammond. "Isospin Purity of T=1 States in the A=38 Nuclei Studied Via Lifetime Measurements in K38." Physical Review C 75, no. 1 (January 16, 2007): 014309:1-14309:6. doi:10.1103/PhysRevC.75.014309.