Levels in Zr 90 : Theoretical
1959; American Institute of Physics; Volume: 115; Issue: 6 Linguagem: Inglês
10.1103/physrev.115.1627
ISSN1536-6065
AutoresB. F. Bayman, A.S. Reiner, Raymond K. Sheline,
Tópico(s)Inorganic Chemistry and Materials
ResumoAn attempt is made to describe the seven levels of ${\mathrm{Zr}}^{90}$ below 3.6 Mev in terms of the proton configurations ${(2{p}_{\frac{1}{2}})}^{2}$, ($2{p}_{\frac{1}{2}}1{g}_{\frac{9}{2}}$), and ${(1{g}_{\frac{9}{2}})}^{2}$. The level positions and the compositions of the two 0+ states are determined for Gaussian and Yukawa forces of various ranges and exchange characters. The experimental data are well reproduced for a reasonable choice of the force parameters, the best fit being obtained with a Serber exchange mixture and a range of about 1.5 fermis. The experimental values of the half-lives of the excited states can also be reconciled with these simple configurational assignments. The most serious discrepancy is in the half-life of the first excited (0+) state, which we calculate to be 1.35\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}8}$ sec, as compared to the observed value of (6.0\ifmmode\pm\else\textpm\fi{}1.5)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}8}$ sec. The remaining discrepancies in the energies and half-lives are in the direction of the effects produced by a slight deformation of the ${\mathrm{Sr}}^{88}$ core.
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