PoS - Proceedings of Science
Volume 441 - XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP2023) - Neutrino Physics and Astrophysics
A New Method for Detecting Charged-Current Neutrino Interactions on $^{136}$Xe in KamLAND-Zen: Implications for Solar Neutrino Measurements and Fermionic Dark Matter Searches
K. Tachibana*  on behalf of the KamLAND-Zen Collaboration
Full text: pdf
Pre-published on: January 26, 2024
Published on: March 22, 2024
A $\mathrm{^{136}Xe}$ nuclei capture electron neutrinos through charged-current (CC) interaction.
This lead to a excited state of $\mathrm{^{136}{Cs}: \nu_e + \mathrm{^{136}Xe} \rightarrow e^- +\mathrm{^{136}Cs} ~(1^+)}$.
This reaction can be used for low energy solar neutrino measurements and MeV scale mass fermionic dark matter searches.
The recent observation of low-lying isomeric states in $\mathrm{^{136}Cs~(1^+)}$ with lifetimes on the order of 100 ns implies that the CC interaction can be identified by a delayed-coincidence measurement in liquid scintillator detector.
This technique involves detecting a prompt signal consisting of the electron and most of the de-excitation $\gamma$-rays, followed by a delayed signal consisting of the remaining de-excitation $\gamma$-rays with energies below 140 keV.
KamLAND-Zen is an experiment designed to search for neutrinoless double-beta decay of $\mathrm{^{136}Xe}$.
KamLAND-Zen uses organic liquid scintillators dissolving 750 kg of xenon (91% enriched in $\mathrm{^{136}Xe}$) and has the world's largest exposure to the CC reaction.
We conducted a feasibility study of identifying the CC interaction in KamLAND-Zen.
DOI: https://doi.org/10.22323/1.441.0288
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