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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 reactions 35Cl + 175Lu, 40Ar + 170,171Yb, and 36Ar + 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 ), respectively. An assignment of another decay with Eα = (7577±20) keV and T1/2 = (1.1 +5.0−0.5 ) ms to 203gRa is made on the basis of one observed three-decay chain. Tentative evidence for the production of the new isotope 202Ra 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 for 204Ra. The results are Eα = (7484±10) keV and T1/2 = (59 +12−9 ). Earlier findings concerning the decay of two states in 205Ra and an isomer in 207Ra have been confirmed. Approximate values for cross sections have been determined for 202Ra, produced using the 36Ar + 170Yb reaction and for 203Ra, 204Ra, and 205Ra using the 35Cl + 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, Liverpool, L693BX, 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, FIN-00014, Finland

    K. Eskola

  5. PPE Division, CERN, Switzerland

    A. Jokinen

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  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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  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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Leino, M., Uusitalo, J., Allatt, R.G. et al. Alpha decay studies of neutron-deficient radium isotopes. Zeitschrift für Physik A 355, 157–164 (1996). https://doi.org/10.1007/s002180050093

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