Elsevier

Nuclear Data Sheets

Volume 7, Issue 4, April 1972, Pages 299-305, 307-311, 313-361
Nuclear Data Sheets

Nuclear data sheets for A = 92

https://doi.org/10.1016/S0090-3752(72)80041-3Get rights and content

Abstract

The 1960 version of the Nuclear Data Sheets for A = 92 has been revised on the basis of experimental data received prior to March 1, 1972. Information from approximately 150 papers and communications has been included in the present evaluation.

Ten nuclei are known for A = 92. Only the presumed ground states and their half-lives have been established for 92Br, 92Kr, and 92Ru. Extensive investigations of the 92Kr, 92Rb, and 92Sr decay schemes have been reported, but few spin-parity assignments can be made for levels in the daughter nuclei. The stable nuclei 92Zr and 92Mo have been studied via β-decay, γ-decay, transfer reactions, and inelastic scattering; an appreciable number of spin assignments for low-lying levels are firm. Levels in 92Nb up to 0.5 MeV in excitation are well established by transfer reaction and γ-decay studies; however, only tentative spin assignments can be made, many of which are based on shell-model arguments. An analysis of a preliminary 92Tc decay scheme has resulted in a tentative Jπ=(7+) assignment for the 92Tc ground state, a value not previously suggested in the literature. Reaction, γ-decay, and 92Ru decay studies have established some excited levels in 92Tc, but no spins are known.

Several important gaps and uncertainties remain in the data. The normalizations for transition intensities in the 92Kr and 92Rb decay schemes determined by an indirect method result in unexpectedly low log ft values for the ground-state β-branches. Reaction studies are needed to resolve the ambiguity in the placement of low-lying levels in 92Y from 92Sr decay. Above 2.4 MeV in excitation in 92Zr, the correspondence between levels observed in 92Y decay, transfer reactions, and inelastic scattering is not well determined, resulting primarily from the lack of precise energy determinations in reaction studies. An accurate determination of the half-life of the 92Nb ground state and a careful search for the γ-decay of the first-excited state might establish the spin of the ground state independently of shell-model arguments. Firm spin assignments for the lowest-lying 6+ and 8+ levels in 92Mo and a confirmation of the proposed 92Tc decay scheme are required for a firm spin assignment for the 92Tc ground state. The placement of levels in 92Tc observed in γ- and β-decay is uncertain.

Reference List for A = 92 (174)

  • J.K. Dickens et al.

    Level Structure of 92Mo

    Phys. Letters

    (1966)
  • Y.S. Kim et al.

    Studies of (d,d′) Reactions on Sn, Cd, Te, and Mo Isotopes

    Phys. Rev.

    (1966)
  • C.W. Lee et al.

    Some Shell-Model Calculations Using Realistic Interactions

    Nucl. Phys.

    (1966)
  • A.E. Norris et al.

    Nuclear Charge Distribution in Fission: Y92, Y93, Y94, and Y95 Independent Yields

    Phys. Rev.

    (1966)
  • J. Vervier

    Effective Nucleon-Nucleon Interactions in the Y, Zr, Nb, Mo and Tc Isotopes

    Nucl. Phys.

    (1966)
  • I. Amarel et al.

    Half Life Determination of Some Short-Lived Isotopes of Rb, Sr, Cs, Ba, La and Identification of 93,94,95,96Rb as Delayed Neutron Precursors by On-Line Mass Spectrometry

    Phys. Letters

    (1967)
  • C.F. Moore

    Charge Exchange in 91Zr(d,p)92Zr

    Phys. Letters

    (1967)
  • V.V. Volkov et al.

    On the Mechanism of Proton-Transfer Reactions

    Nucl. Phys.

    (1967)
  • J.K. Dickens et al.

    90,92,94Zr(p,p′) Reactions at 12.7 MeV

    Phys. Rev.

    (1968)
  • H. Gauvin

    Emission de Neutrons Differes dans les Reactions Nucleaires Induites par des Particules de Haute Energie

  • J. Konijn et al.

    Inst. Kernphysisch Onderzoek Progr. Rept., 1967–1968

    (1968)
  • E.J. Martens et al.

    The 90Zr and 92Mo(α,α′) Reactions at 31 MeV

    Nucl. Phys.

    (1968)
  • C. Lieber

    Die Spaltprodukte aus der Bestrahlung des Urans mit Neutronen: die Strontium-Isotope

    Naturwissenschaften

    (1939)
  • O. Hahn et al.

    Gentrennte Abscheidung der bei der Uranspaltung entstehenden Krypton- Und Xenon-Isotope

    Naturwissenschaften

    (1940)
  • R. Sagane et al.

    Neutron Induced Radioactivity in Columbium

  • R. Sagane et al.

    Artificial Radioactivity Induced in Zr and Mo

    Phys. Rev.

    (1940)
  • H. Gotte

    Neue bei der Uranspaltung auftretende Strontium- und Yttrium-Isotope

    Naturwissenschaften

    (1941)
  • O. Hahn et al.

    Uber die bei der Uranspaltung auftretenden Strontium und Yttrium Isotope

    Z. Physik

    (1943)
  • W. Seelmann-Eggebert

    Uber einige aktive Yttrium-Isotope

    Naturwissenschaften

    (1943)
  • M.L. Pocl et al.

    Radioactive Zirconium and Columbium

    Phys. Rev.

    (1945)
  • M.L. Wiedenbeck

    Radioactive Isotopes in the Cb Region

    Phys. Rev.

    (1946)
  • D.N. Kundu et al.

    d-H3 Reaction in Cb and Ag

    Phys. Rev.

    (1947)
  • E.E. Motta et al.

    Production of New Tc Activities from Separated Mo Isotopes

    Phys. Rev.

    (1948)
  • D.L. Mock et al.

    Photo-Induced Reactions at 20 MeV

    Phys. Rev.

    (1948)
  • D.N. Kundu et al.

    Columbium 96

    Phys. Rev.

    (1949)
  • C.R. Dillard et al.

    Determination of Gas Half-Lives by the Charged-Wire Technique (II)

    NNES

    (1950)
  • E.J. Hoagland et al.

    Fission Yield of 2.7h Sr(92) and Radiations of 3.5h Y(92)

    NNES

    (1950)
  • P. Preiswerk et al.

    Termschemata einiger Niobisotope

    Helv. Phys. Acta

    (1951)
  • H.K. Ticho et al.

    Gamma Radiations from V48 and Nb92

    Phys. Rev.

    (1952)
  • G.L. Schott et al.

    Assignment of Y92 and Y94

    Phys. Rev.

    (1953)
  • P. Stahelin et al.

    Die Lage der ersten Anregungsstufe in Kernen mit gerader Protonen-und gerader Neutronenzahl

    Nuovo cimento

    (1953)
  • R.A. James

    Excitation Functions of Proton-Induced Reactions of Nb93

    Phys. Rev.

    (1954)
  • W.A. Cassatt et al.

    Decay Scheme of Y92

    Phys. Rev.

    (1955)
  • R.G. Winter

    Search for Double Beta Decay in Cadmium and Molybdenum

    Phys. Rev.

    (1955)
  • G.L. Griffith

    First Excited States in Zr92 and Zr94

    Phys. Rev.

    (1956)
  • G. Herrmann et al.

    Uber einige Strontium- und Yttriumisotope bei der Uranspaltung

    Z. Naturforsch.

    (1956)
  • D.G. Gardner

    Nuclear Decay Scheme Analysis and Characterization Studies of (d,α) Reaction Products

    AECU-3514...
  • R.L. Heath

    Decay of 2.7-hour Sr92

    Phys. Rev.

    (1957)
  • C.F. Coleman

    Relative Transition Probabilities in Certain Even Nuclei

    Nuclear Phys.

    (1958)
  • E. Silva et al.

    (γ,n) and (γ,2n) Reactions in Nb93

    Nuovo cimento

    (1958)
  • Cited by (7)

    • Nuclear data sheets for A = 92

      1980, Nuclear Data Sheets
    • Nuclear Data Sheets for A = 94

      1973, Nuclear Data Sheets
    • The Nb(n, 2n), Nb(n,α) and Nb(n, n') cross sections at 14 MeV

      1981, Journal of Physics G: Nuclear Physics
    View all citing articles on Scopus

    Nuclear Information Research Associate. Work supported by the National Science Foundation through the National Academy of Sciences — National Research Council, Committee on Nuclear Science

    *

    Operated by Union Carbide Corporation for the U. S. Atomic Energy Commission

    View full text