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High-spin states in27Al

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Zeitschrift für Physik

Abstract

The24Mg(α, p γ) reaction has been studied atα-particle energies of 13, 15, and 15.2 MeV. Using method II of Litherland and Ferguson spin assignments or restrictions thereof could be made to the27Al levels atE x =5500 keV (I=11/2, 7/2), 6950 keV (I=11/2, 7/2), 7226 keV (I=9/2), 7286 keV (I=9/2–13/2), 7399 keV (I=11/2, 7/2) and 7443 keV (I=13/2, 9/2). Using the Doppler-shift attenuation method a lifetimeτ=20–50 fs was obtained for theE x =7399 keV level and a limitτ<20 fs for the levels atE x =7443, 7286, 7226, 6950, 6718, and 6287 keV, respectively. Further spin assignments in27Al were obtained by a study of the26Mg(p, γ) reaction at the Ep=2174 keV resonance. Fromγ-ray angular distributions the resonance spin was determined as I=9/2 (previous assignmentI=7/2) and the spin of theE x =5959 keV level was determined asI=7/2. Tentative spin assignments were made to the levels atE x =6537 keV (I=7/2) and 6718 keV (I=9/2). From the combined evidence of the24Mg(α, p) and26Mg(p, γ) reactions the spin of the 6287 keV level was found to beI=7/2. The results are compared with shell model calculations and the Nilsson model.

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Author notes

  1. H. Röpke

    Present address: CERN, Geneva, Switzerland

Authors and Affiliations

  1. Fakultät für Physik der Universität Freiburg, Freiburg i. Br., W.-Germany

    H. Röpke, P. Betz, G. Bender, V. Glattes, G. Hammel & W. Brendler

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  1. H. Röpke
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  2. P. Betz
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  3. G. Bender
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  4. V. Glattes
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  5. G. Hammel
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  6. W. Brendler
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Work supported by Bundesministerium für Forschung und Technologie and Deutsche Forschungsgemeinschaft.

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Röpke, H., Betz, P., Bender, G. et al. High-spin states in27Al. Z. Physik 268, 391–399 (1974). https://doi.org/10.1007/BF01668915

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  • DOI: https://doi.org/10.1007/BF01668915

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