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The R&D for a new type of liquid xenon (LXe) detector is ongoing to searchfor the neutrinoless double-beta decay ($0\nu2\beta$). As a result of theKamLAND-Zen experiment, it is very important to realize the all active regiondetector for the energy deposition of the radiation. Newly developed additionalBG reduction techniques will improve the sensitivity of $0\nu2\beta$ search inthe future. Our detector concept is LXe stored in a new type of plasticscintillator vessel. The wavelength of LXe scintillation light is shifted tovisible light from 175nm (VUV) on the inner surface of the vessel. Therefore,the LXe scintillation light can be detected by photon sensors which are faraway from the $0\nu2\beta$ target nuclei. The pulse shape difference betweenLXe and plastic scintillator is used for the additional BG reduction. In thefuture, $^{8}$B solar neutrino events will be one of the dominant BGs in$0\nu2\beta$ search. To reduce the $^{8}$B solar neutrino BG, the directionalinformation of the Cherenkov light might be useful. The status of LXe detectorR&D to improve the sensitivity of $0\nu2\beta$ search is reported.

Liquid Xenon detector R&D for $0\nu2\beta$ search (KamXP)