来自DAMA/LIBRA的新结果
New results from DAMA/LIBRA
摘要：
DAMA/LIBRA在I.N.F.N.的Gran Sasso国家实验室运行。这里介绍的是进一步暴露0.34吨x年的结果。它们指的是在2008年9月/10月第一次DAMA/LIBRA升级之前和之后收集的另外两个年度周期。与以前由前DAMA/NaI和DAMA/LIBRA释放的累积接触量相比，现在为1.17吨x年，相当于13个年度周期。这些数据进一步证实了暗物质（DM）粒子在星系晕中存在的模型独立证据，该证据基于DM年度调制特征（8.9 sigma C.L.）。累积暴露）。特别地，随着累积曝光，在NaI（Tl）靶中测量的（2 - 6）keV能量间隔中的单次撞击事件的调制幅度为：（0.0116 ± 0.0013）cpd/kg/keV;测得的位相为（146 ± 7）天，测得的周期为（0.999 ± 0.002）年，与对DM粒子的预期值吻合得很好。
英文摘要：
DAMA/LIBRA is running at the Gran Sasso National Laboratory of the I.N.F.N.. Here the results obtained with a further exposure of 0.34 ton x yr are presented. They refer to two further annual cycles collected one before and one after the first DAMA/LIBRA upgrade occurred on September/October 2008. The cumulative exposure with those previously released by the former DAMA/NaI and by DAMA/LIBRA is now 1.17 ton x yr, corresponding to 13 annual cycles. The data further confirm the model independent evidence of the presence of Dark Matter (DM) particles in the galactic halo on the basis of the DM annual modulation signature (8.9 sigma C.L. for the cumulative exposure). In particular, with the cumulative exposure the modulation amplitude of the single-hit events in the (2 -- 6) keV energy interval measured in NaI(Tl) target is (0.0116 +- 0.0013) cpd/kg/keV; the measured phase is (146 +- 7) days and the measured period is (0.999 +- 0.002) yr, values well in agreement with those expected for the DM particles.
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