The Half-Lives of Aluminum25 and Aluminum26

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The availability of separated isotopes of Mg makes it easy to determine the half life of Al{sup 26}, a member of the Wigner series which has long been suspected to have a half life of approximately 7 seconds, but which has not been confirmed because of the masking 7 second activity of Al{sup 26}. Mg{sup 24}, Mg{sup 25} and Mg{sup 26} (in the form of MgO) have been bombarded with protons from the Berkeley Linear Accelerator, with the following results: (1) Mg{sup 24} yields an activity of approximately 23 seconds half life, presumably due to Na{sup 21} from the reaction ... continued below

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Bradner, Hugh & Gow, J.D. April 24, 1948.

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The availability of separated isotopes of Mg makes it easy to determine the half life of Al{sup 26}, a member of the Wigner series which has long been suspected to have a half life of approximately 7 seconds, but which has not been confirmed because of the masking 7 second activity of Al{sup 26}. Mg{sup 24}, Mg{sup 25} and Mg{sup 26} (in the form of MgO) have been bombarded with protons from the Berkeley Linear Accelerator, with the following results: (1) Mg{sup 24} yields an activity of approximately 23 seconds half life, presumably due to Na{sup 21} from the reaction Mg{sup 24}(p,a)Na{sup 21}; (2) the Mg{sup 25} yields an activity of approximately 8 seconds half life, which they assign to the reaction Mg{sup 25}(p,n)Al{sup 25}; and (3) The Mg{sup 26} yields an activity of approximately 6 seconds half life, assigned to Al{sup 26} according to a similar reaction. It seems probable therefore that the 7 seconds half life normally given for Al{sup 26} is a mixture of these two activities.

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  • Report No.: UCRL-94
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/978599 | External Link
  • Office of Scientific & Technical Information Report Number: 978599
  • Archival Resource Key: ark:/67531/metadc932734

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  • April 24, 1948

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 18, 2016, 3:47 p.m.

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Bradner, Hugh & Gow, J.D. The Half-Lives of Aluminum25 and Aluminum26, report, April 24, 1948; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc932734/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.