Abstract

The energy and angular resolution of a liquid xenon calorimeter for gamma rays in the GeV region is studied by a Monte-Carlo simulation. For a size of (70 cm) 3 , the energy resolution becomes as good as 0.2 % (r.m.s) at ∼10 GeV. The angular resolution is order of 1° (median angle) at several GeV without using the pair converter separated from the main body of the calorimeter. An effective SΩ of ∼1 m 2 sr is attainable. These factors meet the conditions required for observation of line gamma rays emerging from the annihilation of a sort of hypothetical dark matter.

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