Elsevier

Nuclear Physics A

Volume 100, Issue 2, 26 July 1967, Pages 316-332
Nuclear Physics A

The reaction 26Mg(p, γ)27Al: (I). Excitation energies and branching of 27Al levels

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Abstract

The gamma-ray spectra of thirty 26Mg(p, γ)27Al resonances in the range Ep = 0.3−2.8 MeV, were measured with a 20 cm3 Ge(Li) detector. Internal calibration based only on the reaction Q-value and the 511 keV annihilation line, leads to level energies with a precision ranging from a few tenths of a keV for the lower levels to 2 or 3 keV for the higher levels. Branching ratios are reported for the thirty resonance levels and most of the known bound states. A remarkable grouping of resonances which strongly decay to highly excited (Ex6–7 MeV bound states suggests some form of intermediate structure even at the widely spaced low-energy resonances; it can be described only partly in terms of isobaric analogue states.

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    Without the Ge(Li) detector assembly, set up by Professor A.M. Hoogenboom and P. de Wit, this investigation would not have been possible. The patient and accurate assistance of P. J. J. Lamoré in prior measurements with NaI detectors and the help of E. L. de Beer in the analysis of the Ge(Li) spectra are gratefully acknowledge. This investigation was partly supported by the joint program of the “Stichting voor Fundamenteel Onderzoek der Materi” and the “Nederlandse Organisatie voor Zuiver Wetenschappelijk Onderzoek”.

    Present address: Nuclear Research Center, University of Alberta, Edmonton, Canada.

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