1. IE browser is NOT supported anymore. Please use Chrome, Firefox or Edge instead.
2. If you are a new user, please register to get an Indico account through https://login.ihep.ac.cn/registIndico.jsp. Any questions, please email us at helpdesk@ihep.ac.cn or call 88236855.
3. If you need to create a conference in the "Conferences, Workshops and Events" zone, please email us at helpdesk@ihep.ac.cn.
4. The max file size allowed for upload is 50 Mb.

The Potential to Probe Solar Neutrino Physics with LiCl Water Solution

Aug 10, 2022, 8:30 AM
Oral report 粒子物理实验技术 Parallel Session III (5):Particle Detector Technology


Dr Zhe Wang (Tsinghua University) 文辉 邵 (清华大学)


Lithium chloride water solution is a good option for solar neutrino detection. The $\nu_{e}$ charged-current (CC) interaction cross-section on ${}^{7}\mathrm{Li}$ is evaluated with new B(GT) experimental measurements. The total CC interaction cross-section weighted by the solar ${}^{8}\mathrm{B}$ electron neutrino spectrum is $3.759\times10^{−42}~\mathrm{cm}^{2}$, which is about $60$ times that of the neutrino-electron elastic scattering process. The final state effective kinetic energy after the CC interaction on ${}^{7}\mathrm{Li}$ directly reflects the neutrino energy, which stands in sharp contrast to the plateau structure of recoil electrons of the elastic scattering. With the high solubility of LiCl of $74.5 ~\mathrm{g}/100 ~\mathrm{g}$ water at $10{}^{\circ}\mathrm{C}$ and the high natural abundance of $92.41\%$, the molarity of ${}^{7}\mathrm{Li}$ in water can reach $11 \mathrm{mol/L}$ for safe operation at room temperature. The CC event rate of $\nu_{e}$ on ${}^{7}\mathrm{Li}$ in the LiCl water solution is comparable to that of neutrino-electron elastic scattering. In addition, the $\nu_{e}$ CC interaction with the contained ${}^{37}\mathrm{Cl}$ also contributes a few percent of the total CC event rate. The contained ${}^{35}\mathrm{Cl}$ and ${}^{6}\mathrm{Li}$ also make a delay-coincidence detection for electron antineutrinos possible. The recrystallization method is found to be applicable for LiCl sample purification. The measured attenuation length of $11\pm1$ m at $430 \mathrm{nm}$ shows that the LiCl solution is practicable for a $10\mathrm{-m}$ diameter detector for solar neutrino detection. Clear advantages are found in studying the upturn effect of solar neutrino oscillation, light sterile neutrinos, and Earth matter effect. The sensitivities in discovering solar neutrino upturn and light sterile neutrinos are shown. More details of the work can be found in arxiv:$2203.01860$.

Primary authors

Dr Zhe Wang (Tsinghua University) 文辉 邵 (清华大学)

Presentation materials