用MURMUR实验探测中子-隐中子跃迁
Probing neutron-hidden neutron transitions with the MURMUR experiment
摘要：
MURMUR是一个新的穿墙中子实验，旨在限制膜世界场景或镜像物质模型中允许的中子/隐藏中子跃迁。核反应堆可以作为一个隐藏的中子源，这样中子就可以穿过一个隐藏的世界或扇区。隐藏的中子可以传播出核芯，远远超出生物屏蔽。然而，隐藏的中子可以与普通物质发生微弱的相互作用，这使得在低噪声测量的背景下检测它们成为可能。在目前的工作中，新颖性在于更好的背景辨别和使用大量的材料-这里是铅-能够增强隐藏的中子再生为可见的中子，以提高检测。输入的这个新的设置进行了研究，使用建模和实验，由于目前进行的测试与实验在BR 2研究核反应堆（SCK $\cdot$ CEN，摩尔，比利时）。由于在BR 2周期02/2019 A期间进行的测量，得出了中子交换概率p的新限值：95% CL下的$p < 4.0 \ \times 10^{-10}$。这个约束比2015年在ILL进行的穿壁中子实验的约束更好，尽管BR 2产生隐藏中子的效率降低了7.4倍，从而提高了使用再生材料进行这种实验的兴趣。
英文摘要：
MURMUR is a new passing-through-walls neutron experiment designed to constrain neutron/hidden neutron transitions allowed in the context of braneworld scenarios or mirror matter models. A nuclear reactor can act as a hidden neutron source, such that neutrons travel through a hidden world or sector. Hidden neutrons can propagate out of the nuclear core and far beyond the biological shielding. However, hidden neutrons can weakly interact with usual matter, making possible for their detection in the context of low-noise measurements. In the present work, the novelty rests on a better background discrimination and the use of a mass of a material - here lead - able to enhance regeneration of hidden neutrons into visible ones to improve detection. The input of this new setup is studied using both modelizations and experiments, thanks to tests currently performed with the experiment at the BR2 research nuclear reactor (SCK$\cdot$CEN, Mol, Belgium). A new limit on the neutron swapping probability p has been derived thanks to the measurements taken during the BR2 Cycle 02/2019A: $p < 4.0 \ \times 10^{-10}$ at 95% CL. This constraint is better than the bound from the previous passing-through-wall neutron experiment made at ILL in 2015, despite BR2 is less efficient to generate hidden neutrons by a factor 7.4, thus raising the interest of such experiment using regenerating materials.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
