Magnetic bubble chambers and sub-GeV dark matter direct detection
Magnetic bubble chambers and sub-GeV dark matter direct detection
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DOI：
10.1103/physrevd.95.095001
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发表时间：
2017-05-02
影响因子：
5
通讯作者：
Rajendran, Surjeet
中科院分区：
文献类型：
--
作者：
Bunting, Philip C.;Gratta, Giorgio;Rajendran, Surjeet
我们提出了单分子磁性晶体的一种新应用：它们作为“磁泡室”用于直接探测亚gev暗物质。这些宏观晶体中的自旋有效地充当独立的纳米级磁铁。当与外部磁场反对准时，它们形成亚稳态，在足够低的温度下，弛豫时间可以很长。存储在该系统中的塞曼能量可以通过局部加热释放，例如由暗物质的散射或吸收引起，导致自旋雪崩（或“磁爆燃”），放大初始热沉积的影响，使检测成为可能。就像传统气泡室中的温度和压力一样，温度和外部磁场为单分子磁性晶体设定了检测阈值。我们讨论了暗物质探测的探测器概念，并提出了改进背景的方法。如果研制成功，这种探测器概念可以在meV-eV质量范围内搜索隐藏的光子暗物质，其灵敏度超过当前界限几个数量级。
We propose a new application of single molecule magnet crystals: their use as "magnetic bubble chambers" for the direct detection of sub-GeV dark matter. The spins in these macroscopic crystals effectively act as independent nanoscale magnets. When antialigned with an external magnetic field they form metastable states with a relaxation time that can be very long at sufficiently low temperatures. The Zeeman energy stored in this system can be released through localized heating, caused for example by the scattering or absorption of dark matter, resulting in a spin avalanche (or "magnetic deflagration") that amplifies the effects of the initial heat deposit, enabling detection. Much like the temperature and pressure in a conventional bubble chamber, the temperature and external magnetic field set the detection threshold for a single molecule magnet crystal. We discuss this detector concept for dark matter detection and propose ways to ameliorate backgrounds. If successfully developed, this detector concept can search for hidden photon dark matter in the meV-eV mass range with sensitivities exceeding current bounds by several orders of magnitude.