Performance of the EDELWEISS-III experiment for direct dark matter searches
Performance of the EDELWEISS-III experiment for direct dark matter searches
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DOI：
10.1088/1748-0221/12/08/p08010
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发表时间：
2017-06
影响因子：
1.3
通讯作者：
E. Armengaud;Q. Arnaud;C. Augier;A. Benoit;L. Berg'e;T. Bergmann;J. Billard;T. Boissière;G. Brès;A. Broniatowski;V. Brudanin;P. Camus;A. Cazes;M. Chapellier;F. Charlieux;M. D. J'esus;L. Dumoulin;K. Eitel;D. Filosofov;N. Foerster;Nicolas Fourches;G. Garde;J. Gascon;A. Giuliani;M. Grollier;M. Gros;L. Hehn;S. Herv'e;G. Heuermann;V. Humbert;Y. Jin;A. Juillard;C. K'ef'elian;M. Kleifges;V. Kozlov;H. Kraus;V. Kudryavtsev;H. Le-Sueur;J. Lin;R. Maisonobe;M. Mancuso;S. Marnieros;A. Menshikov;X. Navick;C. Nones;E. Olivieri;P. Pari;B. Paul;D. Poda;E. Queguiner;M. Robinson;H. Rodenas;S. Rozov;V. Sanglard;B. Schmidt;S. Scorza;B. Siebenborn;D. Tcherniakhovski;L. Vagneron;M. Weber;E. Yakushev;X. Zhang;A. Zolotarova
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文献类型：
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作者：
E. Armengaud;Q. Arnaud;C. Augier;A. Benoit;L. Berg'e;T. Bergmann;J. Billard;T. Boissière;G. Brès;A. Broniatowski;V. Brudanin;P. Camus;A. Cazes;M. Chapellier;F. Charlieux;M. D. J'esus;L. Dumoulin;K. Eitel;D. Filosofov;N. Foerster;Nicolas Fourches;G. Garde;J. Gascon;A. Giuliani;M. Grollier;M. Gros;L. Hehn;S. Herv'e;G. Heuermann;V. Humbert;Y. Jin;A. Juillard;C. K'ef'elian;M. Kleifges;V. Kozlov;H. Kraus;V. Kudryavtsev;H. Le-Sueur;J. Lin;R. Maisonobe;M. Mancuso;S. Marnieros;A. Menshikov;X. Navick;C. Nones;E. Olivieri;P. Pari;B. Paul;D. Poda;E. Queguiner;M. Robinson;H. Rodenas;S. Rozov;V. Sanglard;B. Schmidt;S. Scorza;B. Siebenborn;D. Tcherniakhovski;L. Vagneron;M. Weber;E. Yakushev;X. Zhang;A. Zolotarova
我们提出的测量结果表明，EDELWEISS-III阵列的低温锗探测器直接暗物质搜索的效率。描述了实验装置和FID（全数字化）检测器阵列，以及背景抑制中热和电离信号的双重测量的效率。对于用于符合研究的整套24个FID探测器，基准电离能的基线分辨率主要低于0.7 keVee（FHWM），而热能的基线分辨率主要低于1.5 keVee（FWHM）。用AmBe源测量了FID设计对核反冲的响应以及很好的鉴别能力。在90% C. L时，Rsurf的表面β和α衰变抑制能力< 4 × 10−5/α。已经用210 Pb源测定，用133 Ba源的γ校准证明了对体γ射线事件的排斥，导致在90% C. L.时Rγ −mis− ε < 2.5 × 10−6。在探测器阵列中测得的天然放射性的当前水平以单个γ本底率表示。用65 Zn和68，71 Ge的宇宙成因活化法测量了FID探测器的基准体积分数，其加权平均值为（74.6 ± 0.4）%。文中还讨论了探测器响应的稳定性和均匀性。因此，升级后的EDELWEISS-III探测器的分辨率、阈值和背景水平非常适合在大质量范围内直接搜索WIMP暗物质。
We present the results of measurements demonstrating the efficiency of the EDELWEISS-III array of cryogenic germanium detectors for direct dark matter searches. The experimental setup and the FID (Fully Inter-Digitized) detector array is described, as well as the efficiency of the double measurement of heat and ionization signals in background rejection. For the whole set of 24 FID detectors used for coincidence studies, the baseline resolutions for the fiducial ionization energy are mainly below 0.7 keVee (FHWM) whereas the baseline resolutions for heat energies are mainly below 1.5 keVee (FWHM). The response to nuclear recoils as well as the very good discrimination capability of the FID design has been measured with an AmBe source. The surface β- and α-decay rejection power of Rsurf < 4 × 10−5 per α at 90% C.L. has been determined with a 210Pb source, the rejection of bulk γ-ray events has been demonstrated using γ-calibrations with 133Ba sources leading to a value of Rγ −mis−fid < 2.5 × 10−6 at 90% C.L.. The current levels of natural radioactivity measured in the detector array are shown as the rate of single γ background. The fiducial volume fraction of the FID detectors has been measured to a weighted average value of (74.6 ± 0.4)% using the cosmogenic activation of the 65Zn and 68,71Ge isotopes. The stability and uniformity of the detector response is also discussed. The achieved resolutions, thresholds and background levels of the upgraded EDELWEISS-III detectors in their setup are thus well suited to the direct search of WIMP dark matter over a large mass range.