[Formula Presented]-decay rates of [Formula Presented] and the [Formula Presented] shell closure

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The proton-rich isotopes [Formula Presented], and [Formula Presented] were produced in [Formula Presented] bombardments of [Formula Presented], and [Formula Presented], respectively, and their [Formula Presented]-decay properties were investigated with the use of a fragment mass analyzer and a double-sided Si strip detector. These data yielded unambiguous identifications of [Formula Presented] and [Formula Presented] and half-lives for all three Pb nuclei that are more precise than previously available values. An examination of [Formula Presented] reduced widths in the Pb mass region leads to the conclusion that the [Formula Presented] shell gap is greatly reduced for neutron numbers midway between 82 and 126. Available mass data, manifested in [Formula Presented] values and two-proton separation energies of even-even nuclei with the same neutron numbers, support this conclusion. © 1999 The American Physical Society.

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Physical Review C - Nuclear Physics

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