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- W2062931049 abstract "Evidence is presented for three new, light neptunium isotopes formed by deuteron bombardments of ${mathrm{U}}^{233}$, ${mathrm{U}}^{235}$, and ${mathrm{U}}^{238}$. The isotope ${mathrm{Np}}^{231}$ has a half-life of 50ifmmodepmelsetextpmfi{}3 min. and emits alpha-particles of 6.28-Mev energy; the proportion of decay by electron-capture has not been determined. The isotope ${mathrm{Np}}^{233}$ decays predominantly by electron-capture with a 35ifmmodepmelsetextpmfi{}3-min, half-life; it has an alpha-decay half-life roughly determined to be $mathrm{ca}$. 10 yr. corresponding to a $frac{K}{ensuremath{alpha}}$-branching ratio of 1.5ifmmodetimeselsetexttimesfi{}${10}^{5}$ and the alpha-particles have an energy of 5.53 Mev. A 13ifmmodepmelsetextpmfi{}3-min. period with electromagnetic radiation, indicating orbital electroncapture, is attributed to ${mathrm{Np}}^{232}$. Approximate cross sections for formation of various neptunium isotopes by deuterons of energy from 15 to 100 Mev have been determined. The cross sections are low, of the order of ${10}^{ensuremath{-}26}$ ${mathrm{cm}}^{2}$, possibly because most of the excited nuclei undergo fission." @default.
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- W2062931049 date "1950-05-15" @default.
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- W2062931049 title "New Isotopes of Neptunium" @default.
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- W2062931049 doi "https://doi.org/10.1103/physrev.78.363" @default.
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