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Alpha decay studies of neutron-deficient radium isotopes

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Zeitschrift für Physik A Hadrons and Nuclei

Abstract

Neutron-deficient isotopes of radium have been produced in the reactions35Cl+175Lu,40Ar+170,171Yb, and36Ar+170,171Yb and separated in-flight with a gas-filled recoil separator. The activities have been identified on the basis of correlated alpha decay chains. The alpha particle energy Eα and the half-life T1/2 of an isomeric state of the new isotope,203mRa, have been determined to be (7615±20) keV and (33 +22−10 ) ms, respectively. An assignment of another decay with Eα = (7577±20) keV and T1/2=(1.1 +5.0−0.5 ) ms to203gRa is made on the basis of one observed three-decay chain. Tentative evidence for the production of the new isotope202Ra is also given. The values Eα = (7860±60) keV and T1/2=(0.7 +3.3−0.3 ) ms were measured. Improved decay data have been obtained for204Ra. The results are Eα = (7484±10) keV and T1/2=(59 +12−9 ) ms. Earlier findings concerning the decay of two states in205Ra and an isomer in207Ra have been confirmed. Approximate values for cross sections have been determined for202Ra, produced using the36Ar+170Yb reaction and for203Ra,204Ra, and205Ra using the35Cl+175Lu reaction. The results are 2 nb (202Ra), 4 nb (203Ra), 40 nb (204Ra), and 800 nb (205Ra).

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Authors and Affiliations

  1. Department of Physics, University of Jyväskylä, FIN-40351, Jyväskylä, Finland

    M. Leino, J. Uusitalo, T. Enqvist, S. Hurskanen, A. Jokinen & W. H. Trzaska

  2. Department of Physics, University of Liverpool, L693BX, Liverpool, UK

    R. G. Allatt & R. D. Page

  3. Gesellschaft für Schwerionenforschung, D-64220, Darmstadt, Germany

    P. Armbruster, S. Hofmann & V. Ninov

  4. Department of Physics, University of Helsinki, University of Helsinki, FIN-00014, Finland

    K. Eskola

  5. CERN, PPE Division, Switzerland

    A. Jokinen

Authors
  1. M. Leino
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  2. J. Uusitalo
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  3. R. G. Allatt
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  4. P. Armbruster
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  5. T. Enqvist
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  6. K. Eskola
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  7. S. Hofmann
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  8. S. Hurskanen
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  9. A. Jokinen
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  10. V. Ninov
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  11. R. D. Page
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  12. W. H. Trzaska
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Additional information

Communicated by B. Povh

This work was supported by the Academy of Finland.

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Leino, M., Uusitalo, J., Allatt, R.G. et al. Alpha decay studies of neutron-deficient radium isotopes. Z. Physik A — Hadrons and Nuclei 355, 157–164 (1996). https://doi.org/10.1007/BF02769679

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  • DOI: https://doi.org/10.1007/BF02769679

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