Artificial Collateral Chains to the Thorium and ActiniumFamilies

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The authors have produced and identified two new series of alpha-particle emitting radioactive elements; one is a 'collateral' branch of the actinium (4n + 3) radioactive family and the other is collateral to the thorium (4n) family. The series are of considerable interest in that they are the first whose early members lie on the neutron deficient side of beta stability. They have been produced in high yield of irradiation of thorium with deuterons of energy about {sup 80}Mev in the Berkeley 184-inch cyclotron. So far as the present observations are concerned both of these series begin with isotopes of ... continued below

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Ghiorso, A.; Meinke, W.W. & Seaborg, G.T. July 1, 1948.

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Description

The authors have produced and identified two new series of alpha-particle emitting radioactive elements; one is a 'collateral' branch of the actinium (4n + 3) radioactive family and the other is collateral to the thorium (4n) family. The series are of considerable interest in that they are the first whose early members lie on the neutron deficient side of beta stability. They have been produced in high yield of irradiation of thorium with deuterons of energy about {sup 80}Mev in the Berkeley 184-inch cyclotron. So far as the present observations are concerned both of these series begin with isotopes of protactinium (atomic number 91), although progenitors with higher atomic numbers are to be expected and will possibly be produced and identified. These protactinium isotopes are Pa{sup 227} and Pa{sup 228} formed by d,7n and d,6n reactions respectively.

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  • Report No.: UCRL--134
  • Report No.: AECD-2160
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/928030 | External Link
  • Office of Scientific & Technical Information Report Number: 928030
  • Archival Resource Key: ark:/67531/metadc899316

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 1, 1948

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 3, 2016, 7:45 p.m.

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Ghiorso, A.; Meinke, W.W. & Seaborg, G.T. Artificial Collateral Chains to the Thorium and ActiniumFamilies, report, July 1, 1948; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc899316/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.