Precision measurement of the neutrino velocity with the ICARUS detector in the CNGS beam
M. Antonello, B. Baibussinov, F. Boffelli, P. Benetti, E. Calligarich, N. Canci, S. Centro, A. Cesana, K. Cieslik, D. B. Cline, A. G. Cocco, A. Dabrowska, D. De… 展开作者
M. Antonello, B. Baibussinov, F. Boffelli, P. Benetti, E. Calligarich, N. Canci, S. Centro, A. Cesana, K. Cieslik, D. B. Cline, A. G. Cocco, A. Dabrowska, D. Dequal, A. Dermenev, R. Dolfini, C. Farnese, A. Fava, A. Ferrari, G. Fiorillo, D. Gibin, S. Gninenko, A. Guglielmi, M. Haranczyk, J. Holeczek, A. Ivashkin, J. Kisiel, I. Kochanek, J. Lagoda, S. Mania, A. Menegolli, G. Meng, C. Montanari, S. Otwinowski, A. Piazzoli, P. Picchi, F. Pietropaolo, P. Plonski, A. Rappoldi, G. L. Raselli, M. Rossella, C. Rubbia, P. Sala, E. Scantamburlo, A. Scaramelli, E. Segreto, F. Sergiampietri, D. Stefan, J. Stepaniak, R. Sulej, M. Szarska, M. Terrani, F. Varanini, S. Ventura, C. Vignoli, H. Wang, X. Yang, A. Zalewska, A. Zani, K. Zaremba, P. Álvarez Sanchez, L. Biagi, R. Barzaghi, B. Betti, C. De Gaetani, J. D. González Cobas, D. Passoni, L. Pinto, J. Serrano, P. Spinnato, M. G. Visconti, T. Wlostowski
During May 2012, the CERN-CNGS neutrino beam has been operated for two weeks for a total of 1.8 10^17 pot in bunched mode, with a 3 ns narrow width proton beam bunches, separated by 100 ns. This tightly bunched beam structure allows a very accurate time of flight measurement of neutrinos from CERN to LNGS on an event-by-event basis. Both the ICARUS-T600 PMT-DAQ and the CERN-LNGS timing synchronization have been substantially improved for this campaign, taking ad-vantage of additional independent GPS receivers, both at CERN and LNGS as well as of the deployment of the "White Rabbit" protocol both at CERN and LNGS. The ICARUS-T600 detector has collected 25 beam-associated events; the corresponding time of flight has been accurately evaluated, using all different time synchronization paths. The measured neutrino time of flight is compatible with the arrival of all events with speed equivalent to the one of light: the difference between the expected value based on the speed of light and the measured value is tof_c - tof_nu = (0.10 \pm 0.67stat. \pm 2.39syst.) ns. This result is in agreement with the value previously reported by the ICARUS collaboration, tof_c - tof_nu = (0.3 \pm 4.9stat. \pm 9.0syst.) ns, but with improved statistical and systematic errors.
Measurement of the velocity of neutrinos from the CNGS beam with the Large Volume Detector
本文报道了在Gran Sasso实验室用大体积探测器(LVD)在CNGS基线(732 km)上测量~17 GeV μ子中微子的飞行时间。CERN-SPS加速器已于2012年5月10日至5月24日运行,具有紧密聚束结构,可以在逐个事件的基础上精确测量中微子的速度。LVD已经探测到了48个中微子事件,与光束有关,具有很高的绝对时间精度。这些事件允许建立中微子速度和光速之间的差异的以下限制:-3.8 x 10-6 <(v-c)/c < 3.1 x 10-6(在99% C. L.)。该值比以前的直接测量值低一个数量级。
First search for sterile neutrino oscillation leading to $ν_μ$ disappearance in the Booster Neutrino Beam at ICARUS
University of Houston(休斯顿大学);Tufts University(塔夫茨大学);Centro de Investigacion y de Estudios Avanzados del IPN (Cinvestav)(墨西哥国立自治大学高级研究中心);University of Rochester(罗切斯特大学);University of Texas at Arlington(德克萨斯大学阿灵顿分校);INFN Sezione di Padova and University(意大利国家核物理研究所帕多瓦分部及帕多瓦大学);Fermi National Accelerator Laboratory(费米国家加速器实验室);INFN Sezione di Catania and University(意大利国家核物理研究所卡塔尼亚分部及卡塔尼亚大学);INFN Sezione di Milano Bicocca and University(意大利国家核物理研究所米兰比科卡分部及米兰比科卡大学);Colorado State University(科罗拉多州立大学);INFN Sezione di Bologna and University(意大利国家核物理研究所博洛尼亚分部及博洛尼亚大学);Indian Institute of Science(印度科学学院)
CERN中微子到Gran Sasso(CNGS)项目旨在在CERN产生高能宽带$ν_μ$光束,并将其发送到732公里外的INFN Gran Sasso国家实验室(LNGS)。它的主要目标是通过中微子味振荡观察$ν_τ$的外观。该束于2006年8月开始运行约12天:向目标输送了总量为$7.6~10^{17}$的质子。LVD探测器安装在LNGS的A厅,主要用于超新星中微子的研究,在整个CNGS运行期间一直处于满负荷工作状态。共检测到569个事件与射束溢出时间一致。这与蒙特卡洛模拟的预期事件数量非常一致。
Operation and performance of the ICARUS-T600 cryogenic plant at Gran Sasso underground Laboratory
ICARUS T600液氩时间投影室是新一代的第一个大质量电子探测器,它能够将旧泡室的成像能力与出色的量热能量测量相结合。2001年在帕维亚进行了三个月的地面示范运行后,T600低温工厂在可靠性和安全性方面进行了重大修改,考虑到其在地下环境中的长期运行。T600探测器于2010年春季在INFN Gran Sasso实验室的B厅启动,在那里不间断地运行了大约三年,将暴露于欧洲核子研究中心的数据带到Gran Sasso长基线中微子束和宇宙射线。本文详细介绍了T600低温装置以及在液态氩填充结束后不久成功运行探测器的调试程序。讨论了长期地下运行期间的总体电厂性能和稳定性。最后,退役程序,进行了约6个月后,CNGS中微子束操作结束,报告。
Latest results of the OPERA experiment on nu-tau appearance in the CNGS neutrino beam
OPERA是一个长基线实验,旨在搜索外观模式中的$ν_μ\toν_τ$振荡。它位于INFN Gran Sasso实验室(LNGS),并从2008年到2012年使用来自CERN的CNGS中微子束获取数据。在2015年发现$ν_τ$出现后,由于具有$5.1σ$显著性,选择$ν_τ$候选者的标准已经扩展,并且多变量方法已经用于事件识别。以这种方式,改善了振荡参数和$ν_τ$性质的测量中的统计不确定性。报告结果。
Measurement of muon (anti-)neutrino charged-current quasielastic-like cross section using off-axis NuMI beam at ICARUS
University of Houston(休斯顿大学);Tufts University(塔夫茨大学);Centro de Investigacion y de Estudios Avanzados del IPN (Cinvestav)(墨西哥国家高级研究中心);University of Rochester(罗切斯特大学);University of Texas at Arlington(阿灵顿得克萨斯大学);INFN Sezione di Padova and University(帕多瓦大学意大利核物理研究所分部);Fermi National Accelerator Laboratory(费米国家加速器实验室);Indian Institute of Science(印度科学学院);INFN Sezione di Catania and University(卡塔尼亚大学意大利核物理研究所分部);INFN Sezione di Milano Bicocca and University(米兰比可卡大学意大利核物理研究所分部);Colorado State University(科罗拉多州立大学);INFN Sezione di Bologna and University(博洛尼亚大学意大利核物理研究所分部)