[en] SmFe_9_._3_+_xSi_0_._2B_0_._1 (x=0, 0.5, 1.0) ribbons and their nitrides were prepared by melt-spinning, followed by annealing and subsequent nitriding. The structure and magnetic properties have been investigated by means of powder X-ray diffraction, vibrating sample magnetometer and Mossbauer spectroscopy. Rietveld analysis shows that the augment of Fe content gives rise to an increase of the c/a ratio and cell volume. The increasing amount of Fe atoms occupying the 2e sites results in the change of initial structure. It is indicated that the isomer shift of 3g and 6l atom remains quasi-constant while the 2e atom shows a noticeable increase with the increase of iron content, which further conforms the preferential occupation of excessive Fe atoms at this site. Consistent with Tc, the mean hyperfine field 〈B_h_f〉 has the highest value of 25.7 T when x=0.5. The hyperfine fields at different Fe sites follow the order H2e>H3g>H6l. The highest curie temperature of 477.68 K and the hyperfine field of 25.7 T in the as-quenched ribbons were obtained when x=0.5. Meanwhile, the highest magnetic properties of H_c_j=4.31 kOe, (BH)_m=3.5 MGOe in the nitride powders were found. - Highlights: • Rietveld analysis shows that the augment of Fe content gives rise to an increase of the c/a ratio and cell volume. • The isomer shift of 2e atom shows a noticeable increase according to Fe content, which corroborates the preferential occupation of excessive Fe atoms at this site. • The hyperfine fields at various Fe sites follow the order H2e>H3g>H6l, which corresponds closely with the number of iron near neighbor of each site.

[en] The existence of CP-violation in the leptonic sector is one of the most important issues for modern science. Neutrino physics is a key to the solution of this problem. JUNO (under construction) is the near future of neutrino physics. However CP-violation is not a priority for the current scientific program. We estimate the capability of ${\delta }_{\mathrm{CP}}$ measurement, assuming a combination of the JUNO detector and a superconductive cyclotron as the antineutrino source. This method of measuring CP-violation is an alternative to conventional beam experiments. A significance level of 3σ can be reached for 22% of the ${\delta }_{\mathrm{CP}}$ range. The accuracy of measurement lies between $8^{\mathrm{o}}$ and ${22}^{\mathrm{o}}$. It is shown that the dominant influence on the result is the uncertainty in the mixing angle ${\mathrm{\Theta }}_{23}$.

[en] Neutrino-antineutrino conversion is an important new physics process. The observation of this phenomenon could indicate total lepton number violation and potential CPT-violation. Searching for the appearance of electron antineutrinos from solar neutrinos from ${}_8\mathrm{B}$ decay allows us to hunt for this rare process, although it can also be explained by other mechanisms or hypotheses. This analysis examines the capabilities of observing neutrino-antineutrino transition from ${}_8\mathrm{B}$ unoscillated solar neutrinos using different liquid scintillator detector configurations. High energy reactor neutrinos and atmospheric neutrinos are the two dominant background sources. Large volume liquid scintillator detectors with deep underground shielding, placed far away from reactors and with capabilities of pulse shaped discrimination will significantly increase the search sensitivity. It is demonstrated that for the next generation of large liquid scintillator detectors being planned or under construction, the sensitivity to the average probability of neutrino-antineutrino transitions can reach ${10}^{-6}$, which is an order of magnitude better than the current best experimental limits.

[en] The existence of sterile neutrino is an open question in neutrino physics up to now. The method of neutrino oscillometry provides a powerful tool to test the common 3 + 1 sterile neutrino hypothesis, i.e. three active flavors and one sterile flavor. There are several antineutrino sources which can be used for this method. One of them is the well known isotope chain of ${}^{144}$Ce–${}^{144}$Pr with initial activity around 50–100 kCi. It has compact size and might be installed either outside or inside the detector. Another one is the short-lived isotope ${}^8$Li, which can be produced in nuclear reaction of a proton beam hitting a beryllium target. The lithium source has only the out-of-detector option due to its large size. The proposed Jinping water-based liquid scintillator detector will be used as a detection volume. Above experimental setups will allow us to cover the current best fit values of oscillation parameters with 90% C.L. At the same time, it is sensitive to the region of the Neutrino-4 result.