Elsevier

Nuclear Physics A

Volume 453, Issue 1, 12 May 1986, Pages 1-14
Nuclear Physics A

Decay studies of neutron-rich radium and actinium isotopes, including the new nuclides 232Ra and 232,234Ac

https://doi.org/10.1016/0375-9474(86)90025-4Get rights and content

Abstract

Isotopes of the elements francium to neptunium were produced in multinucleon-transfer reactions of 11.4 MeV/u 238U ions with natW/Ta targets. On-line mass-separated samples were investigated by γ, X and β singles and coincidence measurements. New spectroscopic information was gained on the 231Ac decay. For the first time, β-delayed γ-rays from 232Ra and 232,233,234Ac were observed. Decay schemes for these isotopes are presented, and half-lives of the latter four nuclides were determined to be 250(50) s, 119(5) s, 145(10) s and 44(7) s, respectively. The comparison with theoretical half-life predictions gave remarkable agreement with gross-theory calculations.

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    work supported in part by the Bundesministerium für Forschung und Technologie.

    a

    Present address: Institute of Physics, University of Aarhus, DK-8000 Aarhus C, Denmark.

    b

    On leave of absence from: Institute of Experimental Physics, Warsaw University, 00-681 Warsaw, Poland.

    c

    Present address: RIFA AB, S-16381 Stockholm, Sweden.

    d

    Partially supported by the Polish Ministery of Science, High Education and Technics, under contract MR.I.5.13.01.

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