The Double Chooz collaboration presents a measurement of the neutrino mixing<br />
angle $\theta_{13}$ using reactor $\overline{\nu}_{e}$ observed via the inverse<br />
beta decay reaction in which the neutron is captured on hydrogen. This<br />
measurement is based on 462.72 live days data, approximately twice as much data<br />
as in the previous such analysis, collected with a detector positioned at an<br />
average distance of 1050m from two reactor cores. Several novel techniques have<br />
been developed to achieve significant reductions of the backgrounds and<br />
systematic uncertainties. Accidental coincidences, the dominant background in<br />
this analysis, are suppressed by more than an order of magnitude with respect<br />
to our previous publication by a multi-variate analysis. These improvements<br />
demonstrate the capability of precise measurement of reactor<br />
$\overline{\nu}_{e}$ without gadolinium loading. Spectral distortions from the<br />
$\overline{\nu}_{e}$ reactor flux predictions previously reported with the<br />
neutron capture on gadolinium events are confirmed in the independent data<br />
sample presented here. A value of $\sin^{2}2\theta_{13} =<br />
0.095^{+0.038}_{-0.039}$(stat+syst) is obtained from a fit to the observed<br />
event rate as a function of the reactor power, a method insensitive to the<br />
energy spectrum shape. A simultaneous fit of the hydrogen capture events and of<br />
the gadolinium capture events yields a measurement of $\sin^{2}2\theta_{13} =<br />
0.088\pm0.033$(stat+syst).