Abstract
A strong anticorrelation between ionization and scintillation signals produced by MeV $\ensuremath{\gamma}$ rays in liquid xenon has been measured and used to improve the energy resolution by combining the two signals. The improvement is explained by reduced electron-ion recombination fluctuations of the combined signal compared to fluctuations of the individual signals. Simultaneous measurements of ionization and scintillation signals were carried out with $^{137}\mathrm{Cs}$, $^{22}\mathrm{Na}$, and $^{60}\mathrm{Co}$ $\ensuremath{\gamma}$ rays, as a function of electric field in the liquid. A resolution of $1.7%(\ensuremath{\sigma})$ at $662\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$ was measured at $1\phantom{\rule{0.3em}{0ex}}\mathrm{kV}∕\mathrm{cm}$, significantly better than the resolution from either scintillation or ionization alone. A detailed analysis indicates that further improvement to less than $1%(\ensuremath{\sigma})$ is possible with higher light collection efficiency and lower electronic noise.
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