APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Tomohiro Yamaji (U Tokyo)
Title: Search for Axion Like Particles using Laue-case Conversion in a Single Crystal
Date: Fri, Mar 16, 2018, 15:30 - 16:30
Place: Seminar Room A
Abstract: An X-ray Light Shinning through a Wall (LSW) search for Axion Like Particles (ALPs) has been performed by using a Laue-case conversion within a crystal. Compared to prior LSW experiments using external magnetic fields, the Laue-case conversion has two advantages. Firstly, periodic electric fields within crystals are as high as 10^{11} V/m, which correspond to high magnetic fields of ∼ 10^{3} T. Secondly, the sensitive ALPs' mass can reach m_a = 10 keV by detuning an X-ray injection angle from the Bragg angle. The Laue-case conversion can provide an additional experimental scheme for the model-independent search for heavy ALPs. A LSW experiment using the conversion scheme is performed at a third-generation X-ray synchrotron radiation facility, BL19LXU beam line of SPring-8. A novel X ray-ALP conversion system is developed by using a silicon channel-cut crystal with two 600 µm-thick blades. X rays from the beam line are converted into ALPs by the first blade, and then converted ALPs are subsequently reconverted into detectable X rays by the second blade. No significant signals were observed, and the most stringent upper limit on sub-keV ALPs as a laboratorial search has been obtained.