Final results of the EDELWEISS-II WIMP search using a 4-kg array of cryogenic germanium detectors with interleaved electrodes
Final results of the EDELWEISS-II WIMP search using a 4-kg array of cryogenic germanium detectors with interleaved electrodes
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DOI：
10.1016/j.physletb.2011.07.034
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发表时间：
2011-03
影响因子：
4.4
通讯作者：
E. Armengaud;C. Augier;A. Benoit;L. Berg'e;J. Blumer;A. Broniatowski;V. Brudanin;B. Censier;G. Chardin;M. Chapellier;F. Charlieux;P. Coulter;G. Cox;X. Defay;M. Jésus;Y. Dolgorouki;J. Domange;L. Dumoulin;K. Eitel;D. Filosofov;Nicolas Fourches;J. Gascon;G. Gerbier;J. Gironnet;M. Gros;S. Henry;S. Herv'e;A. Juillard;H. Kluck;V. Kozlov;H. Kraus;V. Kudryavtsev;P. Loaiza;S. Marnieros;X. Navick;C. Nones;E. Olivieri;P. Pari;L. Pattavina;B. Paul;M. Robinson;S. Rozov;V. Sanglard;B. Schmidt;S. Scorza;S. Semikh;A. Torrento-Coello;L. Vagneron;M.-A. Verdier;R. Walker;E. Yakushev
中科院分区：
文献类型：
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作者：
E. Armengaud;C. Augier;A. Benoit;L. Berg'e;J. Blumer;A. Broniatowski;V. Brudanin;B. Censier;G. Chardin;M. Chapellier;F. Charlieux;P. Coulter;G. Cox;X. Defay;M. Jésus;Y. Dolgorouki;J. Domange;L. Dumoulin;K. Eitel;D. Filosofov;Nicolas Fourches;J. Gascon;G. Gerbier;J. Gironnet;M. Gros;S. Henry;S. Herv'e;A. Juillard;H. Kluck;V. Kozlov;H. Kraus;V. Kudryavtsev;P. Loaiza;S. Marnieros;X. Navick;C. Nones;E. Olivieri;P. Pari;L. Pattavina;B. Paul;M. Robinson;S. Rozov;V. Sanglard;B. Schmidt;S. Scorza;S. Semikh;A. Torrento-Coello;L. Vagneron;M.-A. Verdier;R. Walker;E. Yakushev
EDELWEISS-II合作已经完成了对WIMP暗物质的直接搜索，在Modane的Souterrain实验室使用了10个400 g低温锗探测器阵列。热声子传感器和具有交错几何形状的电荷收集电极的组合使用使得能够有效地抑制γ诱导的放射性以及近表面相互作用。已达到384 kg/d的总有效暴露量，主要来自14个月的连续运行。在20 keV以上观测到五个核反冲候选者，而估计的背景是3.0个事件。这一结果被解释在限制的横截面上的自旋无关的相互作用的WIMP和核子。对于85 GeV的WIMP质量，在90%CL下排除了4.4×10− 8 pb的截面。新的约束条件也设置在模型中的WIMP核子散射是非弹性的。
The EDELWEISS-II Collaboration has completed a direct search for WIMP dark matter with an array of ten 400-g cryogenic germanium detectors in operation at the Laboratoire Souterrain de Modane. The combined use of thermal phonon sensors and charge collection electrodes with an interleaved geometry enables the efficient rejection of γ-induced radioactivity as well as near-surface interactions. A total effective exposure of 384 kg d has been achieved, mostly coming from fourteen months of continuous operation. Five nuclear recoil candidates are observed above 20 keV, while the estimated background is 3.0 events. The result is interpreted in terms of limits on the cross-section of spin-independent interactions of WIMPs and nucleons. A cross-section of 4.4×10−8pb is excluded at 90%CL for a WIMP mass of 85 GeV. New constraints are also set on models where the WIMP-nucleon scattering is inelastic.