Properties of high-spin states in Nb91 and Zr91 via Li6-induced reactions

B. A. Brown, P. M. S. Lesser, and D. B. Fossan
Phys. Rev. C 13, 1900 – Published 1 May 1976
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Abstract

The properties of high-spin states in Nb91 and Zr91 have been studied with the Sr88(Li6,3n)Nb91 and Sr88(Li6,p2n)Zr91 reactions. In-beam measurements with Ge(Li) and Si(Li) detectors of γ-ray excitation functions, γγ coincidences, γ-ray angular distributions, and pulsed beam-γ timing spectra were made to establish decay schemes, level energies, spin-parity assignments, γ-ray multipolarities, and isomeric lifetimes. All of the high-spin states involving the π1g92, π2p12, and ν2d52 orbitals as well as other more complicated states were identified. In particular, the theoretically predicted isomeric states in Nb91 and Zr91 were found: the |(1g92)22p12,172 state in Nb91 is at 2035 keV with a τ=5.42±0.18 μsec, and the |(1g92)22d52,212+ state in Zr91 is at 3167 keV with a τ=6.28±0.20 μsec. The experimental energy levels and B(E2) values obtained for these nuclei as well as those of other N=50 and 51 nuclei are compared with recent theoretical work of Gloeckner et al. The E2 effective charges for the mass-90 region are discussed.

NUCLEAR REACTIONS Sr88(Li6,3n), Sr88(Li6,p2n), E=34 MeV, pulsed beam; measured γγ coincidence; deduced levels in Nb91 and Zr91; measured γ(E, θ, t); deduced Jπ, T12, branching ratio, δ(E2M1), B(E2), effective charges. Natural target, Ge(Li) and Si(Li) detectors.

  • Received 17 December 1975

DOI:https://doi.org/10.1103/PhysRevC.13.1900

©1976 American Physical Society

Authors & Affiliations

B. A. Brown*, P. M. S. Lesser, and D. B. Fossan

  • Department of Physics, State University of New York, Stony Brook, New York 11794

  • *Present address: Michigan State University, East Lansing, Michigan.
  • Present address: Brooklyn College of The City University of New York, Brooklyn, New York.

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Issue

Vol. 13, Iss. 5 — May 1976

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