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Gamma and Alpha decay from the 2.1-msec isomer213mRa

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

The isomer213mRa was produced by the reaction209Bi(10B, 6n), as well as by bombardments of12C on Pb isotopes,14N on Bi, and16O on natural Hg, with projectile energies in the range 60–100 MeV. The isomer decays with a halflife of 2.1 ms both via gamma internal transitions and via alpha branching to levels in209Rn. A level scheme is proposed in which the isomeric state is assigned as either 17/2− or 13/2+ with shell-model configurations either of theh 9/2 protons coupled to ap 1/2 neutron hole, or of an uncoupledi 13/2 neutron hole. On the basis of alpha decay rate predictions from the new Fliessbach theory, the 17/2− isomeric assignment is to be preferred.

Phys. Abstracts classifications 4.200–4.375

E [Radioactivity213mRa [from209Bi(10B, 6n),204-6Pb(12C, 3n–5n) etc.,E=60–100 MeV]; measuredE α ,E γ ,I α ,I γ ,I x ,γγ-coin,xγ-coin,α K,T 1/2.213Ra,209Rn deduced levels,J, π,γ-multipolarity.]

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Author notes

  1. D. G. Raich

    Present address: Argonne National Laboratory, Chemistry Division, 60439, Argonne, IL

  2. R. E. Eppley

    Present address: Mound Laboratory, Monsanto Research Corp., 45342, Miamisburg, OH

  3. I. Rezanka

    Present address: Research Laboratory, Xerox Corp., 14600, Rochester, New York

Authors and Affiliations

  1. Lawrence Berkeley Laboratory, University of California, Berkeley, USA

    D. G. Raich, H. R. Bowman, R. E. Eppley & J. O. Rasmussen

  2. Heavy Ion Accelerator Laboratory, Yale University, New Haven, USA

    I. Rezanka

Authors
  1. D. G. Raich
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  2. H. R. Bowman
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  3. R. E. Eppley
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  4. J. O. Rasmussen
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  5. I. Rezanka
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Additional information

The authors wish to extend their sincere appreciation to the staffs of the Yale and Berkeley HILACs, who helped greatly in facilitating the experimental work. Particular thanks are due Mr. Solly Simone, formerly of Yale HILAC, for his practical suggestions on producing thin self-supporting targets by vacuum deposition. We also gratefully acknowledge helpful discussions with Dr. L.J. Jardine of the Lawrence Berkeley Laboratory. This work was supported by the U.S.-A.E.C. and E.R.D.A., and by a fellowship to one of the authors (J.O.R.) from the J.S. Guggenheim Foundation (1973).

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Raich, D.G., Bowman, H.R., Eppley, R.E. et al. Gamma and Alpha decay from the 2.1-msec isomer213mRa. Z Physik A 279, 301–311 (1976). https://doi.org/10.1007/BF01408303

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  • DOI: https://doi.org/10.1007/BF01408303

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