New neutron-deficient Pb and Bi nuclides produced in cross bombardments with heavy ions

Y. Le Beyec, M. Lefort, J. Livet, N. T. Porile, and A. Siivola
Phys. Rev. C 9, 1091 – Published 1 March 1974
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Abstract

New α -emitting bismuth nuclides ranging in mass number from 189 to 197 and lead nuclides ranging from 186 to 192 have been produced in the following reactions: Tl203(He3,xn)206xBi, Re187(O16,xn)205xBi, Re185(O16,xn)203xBi, Ta181(Ne20,xn)201xBi, Tb159(Ar40,xn)199xBi, Ta181(F19,xn)200xPb, W182(O16,xn)198xPb and Gd155(Ar40,xn)195xPb. Assignments were made on the basis of excitation function measurements and comparison with similar reactions leading to the formation of the analogous well-known Po nuclides. The following assignments were made, where for each nuclide the two listed numbers are the α-ray energy in MeV and half-life: Bim197—5.77, 10 min; Bi195-5.43, 170 sec; Bim195—6.11, 90 sec; Bi194-5.61, 105 sec; Bi193-5.90, 64 sec; Bim193—6.18; Bi192-6.06, 42 sec; Bi191-6.32, 13 sec; Bim191—6.63; Bim191—6.86; Bi190-6.45, 5.4 sec; Bi189-6.67, <2 sec; Pb192-5.06, 2.3 min; Pb191-5.29, 1.3 min; Pb190-5.58, 1.2 min; Pb189-5.72, 51 sec; Pb188-5.98, 26 sec; Pb187-6.08, 17 sec; and Pb186-6.32, 8 sec. Estimates of α branching ratios are also presented.

[RADIOACTIVITY new nuclides Bim197, Bi195, Bim195, Bi194, Bim913, Bi192, Bi191, Bim191, Bi190, Bi189, Pb192, Pb191, Pb190, Pb189, Pb188, Pb187, Pb186; nuclides produced in various (HI,xn) reactions; measured Eα, t12, α branching ratios.]

  • Received 9 July 1973

DOI:https://doi.org/10.1103/PhysRevC.9.1091

©1974 American Physical Society

Authors & Affiliations

Y. Le Beyec, M. Lefort, and J. Livet

  • Laboratoire de Chimie Nucléaire, Institut de Physique Nucléaire, 91406-Orsay, France

N. T. Porile*

  • Department of Chemistry, Purdue University, Lafayette, Indiana 47906

A. Siivola

  • Department of Physics, University of Helsinki, Finland
  • Lawrence Berkeley Laboratory, Berkeley, California 94720

  • *Guggenheim Memorial Fellow at Institut de Physique Nucléaire, Orsay, France, 1971-72; supported in part by the U. S. Atomic Energy Commission.

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Vol. 9, Iss. 3 — March 1974

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