Abstract
Spin assignments have been made to the25Mg levels in theE x=5–6 MeV region fromγ-ray angular distributions measured in the22Ne(α, n y) reaction atE α=8.0 and 8.8 MeV and fromp-γ angular correlations measured in the24Mg(d, p γ) reaction atE d=6 MeV. Unique spin assignments ofJ=7/2, 5/2, 5/2, and 9/2 could be made to the levels atE x=5005, 5511, 5851, and 5967 keV, respectively. Ambigious assignments have been made to the levels atE x=5245, 5524, 5785, 6032 keV (J=11/2, 7/2), 5455 keVJ=13/2, 9/2), and 5738 keV (J=3/2, 5/2). The present data confirm previous assignments ofJ=1/2 to the levels atE x=5108 and 5466 keV, respectively. Lifetime estimates have been obtained, using the Doppler-shift attenuation method, for the levels atE x=5245 keV (τ=30–60 fs), 5785 keV (τ=50–100 fs), 5967 keV (τ=50–100 fs), and 5455 keV (τ>1ps). All other levels in theE x=5–6 MeV region haveτ<60 fs. A breakdown of theK-selection rule has been observed in theγ-decay of some high spin states, indicating a deviation from the strong coupling model.
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Work supported by Bundesministerium für Bildung und Wissenschaft und Deutsche Forschungsgemeinschaft.
We are indebted to Dr. R.W. Ollerhead for the communication of lifetime measurements prior to publication. The help of the technical staff of the accelerator is gratefully acknowledged. The data reduction was done on the IBM 7040 computer of the University of Freiburg.
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Röpke, H., Hammel, G., Brendler, W. et al. New aspects of the rotational model in25Mg. Z. Physik 266, 55–64 (1974). https://doi.org/10.1007/BF01668665
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DOI: https://doi.org/10.1007/BF01668665