Directional dark matter search with nuclear emulsion

Takashi Asada,Y Aharonov,S Kabana,L Bravina

doi:10.1051/epjconf/201818202006

Takashi Asada, Y Aharonov + Show 2 more

Open Access

https://doi.org/10.1051/epjconf/201818202006

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Abstract

Direct dark matter searches are promising techniques to identify the nature of dark matter particles. The directional information is a distinctive directional property of the dark matter distribution against the cosmic background. The NEWSdm project is a unique experiment among several directional detection projects because of its solid-state detector. The expected signal of WIMP-induced nuclear recoil in such a detector is submicron scale. The high-resolution nuclear emulsion and the special readout method were developed for such extremely short tracks. Technologies for background identification and large-scale analysis are developing toward several kg scale experiment at Gran Sasso underground laboratory in the coming years

Highlights

Directional information for the dark matter search is attracting attention recently
Direct dark matter search experiments are aiming to detect a rare interaction of these particles and the target nucleus in the detector
The dark matter signal should be clearly distinguishable against the same amount of isotropic background if the nuclear emulsion is capable of detecting track length of EPJ Web of Conferences 182, 02006 (2018) ICNFP 2017

Summary

Introduction

Directional information for the dark matter search is attracting attention recently. The dark matter is considered to be distributed as a halo around the galaxy as indicated in the flat velocity curve of the galaxy. Direct dark matter search experiments are aiming to detect a rare interaction of these particles and the target nucleus in the detector. LUX [6] and PANDAXII [7] and XENON1T [8] already excluded this region In addition to this conflict, the largest scale experiments are approaching a background from solar neutrinos. Directional information of signal nuclei scattered by dark matter gathers interest for this reason. The Velocity distribution of the dark matter must be deflected by the revolution of the solar system. Solar neutrino from the sun has distinctly different velocity distribution These two signals can be identified by using directionality [9]. The angular distribution of recoiled nuclei should change if dark matter has inelastic interaction [3]. Directional information reveals dark matter properties in addition to identification

NEWSdm project

Detector crystal size NIT

Readout technology

Conclusion