High-spin states in26Mg |
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Authors: | F Glatz S Norbert E Bitterwolf A Burkard F Heidinger Th Kern R Lehmann H Röpke J Siefert C Schneider B H Wildenthal |
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Institution: | 1. Fakult?t für Physik der Universit?t Freiburg, Freiburg i. Br., Germany 2. Department of Physics and Atmospheric Sciences, Drexel University, Philadelphia, Pennsylvania, USA
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Abstract: | Theγ-decays of levels in26Mg have been investigated up to 12.5 MeV excitation energy by proton-γ-ray coincidence measurements in the23Na(α, pγ) reaction at 14.2 and 16 MeV bombarding energy. Lifetime-measurements, made with the Doppler-shift attenuation method, and proton-γ-ray angular-correlation measurements were performed at Eα=14.2 MeV. Many high-spin states were observed, among them levels at 6,978 (5+), 7,283(4?), 7,395(5+), 7,953(5?), 8,202(6+), 8,472(6+), 9,065(5), 9,112(6+), 9,169(6?), 9,383 (6+), 9,542(5), 9,829(7+), 9,989(6+) and 12,479(8+, 7?) keV excitation energy. The spectrum of positive-parity states and their electromagnetic properties are reproduced with good accuracy by shell-model calculations which employ a unifieds-d shell Hamiltonian and the unrestricted configuration space of the 0d 5/2 1s 1/2 0d 3/2 shell. Members of five inferred rotational bands, withK π=0+, 2+, 3+, 0+ and 3? have been observed up to at leastI=6. TheK π=2+ band shows strong anomalies of excitation energies andE2 transition rates near theI=6 state. The static intrinsic quadrupole moments calculated from the shell model wave functions indicate transitions from prolate to oblate deformation within theK π=2+ band and also the ground state band. The lowest lyingI π=4+ state appears to be “spherical” and cannot be associated with a rotational band. |
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