Spin-Dependent WIMP Limits from a Bubble Chamber
Spin-Dependent WIMP Limits from a Bubble Chamber
复制标题
气泡室中自旋相关的 WIMP 限制
作者：
E. Behnke;J. Collar;P. Cooper;K. Crum;M. Crisler;M. Hu;I. Levine;D. Nakazawa;H. Nguyen;B. Odom;E. Ramberg;J. Rasmussen;N. Riley;A. Sonnenschein;M. Szydagis;R. Tschirhart
气泡室是几十年来用于加速器实验中粒子探测的主要技术，最终随着其他技术的出现而被淘汰。我们在这里报告这些设备的新应用。我们操作一个超净，室温气泡室含有1.5公斤的过热CF3I，一个目标最敏感的自旋相关和独立的弱相互作用大质量粒子（WIMP）耦合。一个极端的固有的不敏感性的背景，通常限制直接搜索暗物质的测量在这个设备的操作条件下，导致低能量核反冲的检测像那些预期的WIMP。在我们的实验中提取了自旋相关的WIMP质子散射截面的改进限制，排除了这种类型的耦合作为最近粒子暗物质探测的可能解释。
Bubble chambers were the dominant technology used for particle detection in accelerator experiments for several decades, eventually falling into disuse with the advent of other techniques. We report here on a new application for these devices. We operated an ultraclean, room-temperature bubble chamber containing 1.5 kilograms of superheated CF3I, a target maximally sensitive to spin-dependent and -independent weakly interacting massive particle (WIMP) couplings. An extreme intrinsic insensitivity to the backgrounds that commonly limit direct searches for dark matter was measured in this device under operating conditions leading to the detection of low-energy nuclear recoils like those expected from WIMPs. Improved limits on the spin-dependent WIMP-proton scattering cross section were extracted during our experiments, excluding this type of coupling as a possible explanation for a recent claim of particle dark-matter detection.