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We present measurements of the branching fractions of the decays B+ -> eta'K+ and B0 -> eta' K0. For B0 -> eta' K0s we also measure the time dependentCP-violation parameters S and C, and for B+ ->eta' K+ the time-integratedcharge asymmetry Ach. The data sample corresponds to 88.9 million BBbar pairsproduced by e+e- annihilation at the Upsillon(4S). The results areB(B+->eta'K+) = (76.9 +/- 3.5 +/- 4.4)*10^-6, B(B0->eta'K0) = (60.6 +/- 5.6 +/-4.6)*10^-6, S = 0.02+/-0.34 +/- 0.03, C = 0.10+/-0.22 +/- 0.04, and Ach = 0.037+/- 0.045+/- 0.011.Comment: 7 pages, 2 postscript figues, resubmitted Phys. Rev. Letters in  response to review. Revised K0s reconstruction efficiency calculation  resulting in ~10% upward revision of the value of B(B0->eta'K0) (and downward  shift of the charged/neutral ratio of decay rates); minor revision of  systematic on

physical review letters

Measurements of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>-Violating Asymmetries and Branching Fractions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>Meson Decays to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>η</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:mi>K</mml:mi></mml:math>

Measurements ofCP-Violating Asymmetries and Branching Fractions inBMeson Decays toη′K