Studies of micro time projection chambers using negative ion gas (NIμTPC) are conducted especially for direction-sensitive dark matter searches. A NIμTPC enables to measure the absolute position in the drift direction for self-triggering TPCs. This study provides a development of a NIμTPC using a micro pixel chamber (μ-PIC) with dedicated readout electronics, and an evaluation of the capability of three-dimensional absolute position reconstruction of nuclear recoil using a neutron source. The absolute track position was reconstructed throughout the drift volume with an efficiency of 70±5%. This work marks an important step for the NIμTPCs towards the practical use for directional dark matter searches.
@article{arxiv.2302.10725,
title = {First reconstruction of absolute three-dimensional position of nuclear recoils using a negative ion $\mu$-TPC for dark matter search experiments},
author = {Satoshi Higashino and Takuya Shimada and Tomonori Ikeda and Hirohisa Ishiura and Ryo Kubota and Ayaka Nakayama and Mizuno Ofuji and Kentaro Miuchi},
journal= {arXiv preprint arXiv:2302.10725},
year = {2023}
}