New proton radioactivities 165,166,167Ir and 171Au

C. N. Davids, P. J. Woods, J. C. Batchelder, C. R. Bingham, D. J. Blumenthal, L. T. Brown, B. C. Busse, L. F. Conticchio, T. Davinson, S. J. Freeman, D. J. Henderson, R. J. Irvine, R. D. Page, H. T. Penttilä, D. Seweryniak, K. S. Toth, W. B. Walters, and B. E. Zimmerman
Phys. Rev. C 55, 2255 – Published 1 May 1997
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Abstract

The new proton radioactivities 165,166,167Ir and 171Au have been observed. The Ir isotopes were produced via the 92Mo(78Kr,pxn)165,166,167Ir reactions at 357 and 384 MeV. 171Au was produced via the 96Ru(78Kr,p2n)171Au reaction at 389 MeV. The proton emitters were each identified by position, time, and energy correlations between the implantation of a residual nucleus into a double-sided silicon strip detector, the observation of a decay proton, and the subsequent observation of a decay alpha particle from the daughter nucleus (164,165,166Os and 170Pt, respectively). Both 166Ir and 167Ir have proton-emitting ground and isomeric states, which also decay by alpha emission. The proton-decay rates have been reproduced by calculations using the WKB barrier penetration approximation and a low-seniority shell-model calculation of the spectroscopic factors. The alpha decays of the four nuclei are followed by chains of alpha decays, allowing the determination of single-particle orbital orderings. Mass information has also been obtained from the alpha-decay chains because a connection to a known mass can be obtained for one of the nuclei. Ground-state mass excesses are reported for 151Tm, 154Yb, 155Lu, 158Hf, 159Ta, 162W, 163Re, 166Os, 167Ir, and 170Pt. The mass excess for 171mAu is also given. Proton separation energies are also deduced for the odd-Z alpha daughter nuclei of the Ir proton emitters.

  • Received 13 January 1997

DOI:https://doi.org/10.1103/PhysRevC.55.2255

©1997 American Physical Society

Authors & Affiliations

C. N. Davids1, P. J. Woods2, J. C. Batchelder3, C. R. Bingham4,5, D. J. Blumenthal1, L. T. Brown1,6, B. C. Busse7, L. F. Conticchio8, T. Davinson2, S. J. Freeman9, D. J. Henderson1, R. J. Irvine2, R. D. Page2, H. T. Penttilä1,8, D. Seweryniak1,8, K. S. Toth5, W. B. Walters8, and B. E. Zimmerman4

  • 1Argonne National Laboratory, Argonne, Illinois 60439
  • 2University of Edinburgh, Edinburgh, United Kingdom
  • 3Louisiana State University, Baton Rouge, Louisiana 70803
  • 4University of Tennessee, Knoxville, Tennessee 37996
  • 5Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
  • 6Vanderbilt University, Nashville, Tennessee 37235
  • 7Oregon State University, Corvallis, Oregon 97331
  • 8University of Maryland, College Park, Maryland 20742
  • 9University of Manchester, Manchester, United Kingdom

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Vol. 55, Iss. 5 — May 1997

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