The Migdal effect associated with nuclear scattering is very important in the dark matter search. In order to experimentally verify the Migdal effect, we are proceeding MIRACLUE experiment: searching for Migdal effect by using poistion sensitive gaseous detectors. In this talk, we will report on the status of the experiment using xenon gas TPC.
Migdal effect refers to a rare process in which atomic ionization or excitation occurs when a nucleus suddenly moves. Since this process can produce an additional electronic signal, it is expected to improve the sensitivity to low-mass WIMPs (Weakly Interacting Massive Particles). However, Migdal effect induced by nuclear recoils has not yet been experimentally confirmed. The MIRACLUE...
The Migdal effect has attracted considerable attention in recent years due to its significant contribution to the sensitivity of sub-GeV dark matter detectors in theoretical calculations. This report will present our experiment that directly observes the Migdal effect using the gas micropixel detector designed by MARVEL group at a D-D neutron source. We will introduce the detector structure...
The Migdal In Galactic Dark mAtter expLoration (MIGDAL) was established in 2019 to experimentally verify, under optimal conditions, the theoretical prediction of the effect postulated by A. Migdal in 1939 and reformulated for dark matter searches by M. Ibe in 2017. The MIGDAL experiment aims to unambiguously observe and measure the Migdal effect across multiple elements relevant to dark...
This presentation focuses on the primary background processes inherent in the direct search for the Migdal effect using fast neutron beams with a low-pressure time projection chamber (TPC). We will discuss the simulation, characterisation, and rejection of three primary backgrounds that can mimic this signal. First is the challenge of neutron inelastic scattering on the detector target and...
Many dark matter experiments are exploiting the Migdal effect, a rare atomic process, to improve sensitivity to low-mass WIMP-like dark matter candidates. However, this process is yet to be directly observed in nuclear scattering. The MIGDAL experiment aims to make the first unambiguous measurement of the Migdal effect in nuclear scattering. A low-pressure optical Time Projection Chamber is...
The Migdal effect predicts the possible deposition of electron recoil energy in neutral particle-induced nuclear recoil interactions. This effect can lead to substantial gain of sensitivity to low-mass dark matter interactions in xenon-based dark matter experiments. A direct measurement of this effect in liquid xenon is highly desired to confirm its applicability to direct search experiments....
We present calculations of the Migdal effect using the Dirac-Hartree-Fock method without relying on the dipole approximation, enabling robust predictions at higher nuclear recoil velocities than previously accessible. We demonstrate that multiple ionisation may become significant for fast neutrons and derive semi-inclusive probabilities for processes producing one hard electron above a defined...
Directly detecting and characterizing the Migdal effect signature in gas time projection chambers (TPCs) remains challenging due to the overlapping nature of its electron recoil (ER) and nuclear recoil (NR) components. This talk will present two complementary machine learning frameworks developed and deployed within the MIGDAL collaboration that together enable real-time detection and...
