Are there more than three types of neutrinos in nature ? Some experiments show that there should exist at least one more type, called sterile neutrinos. Using atmospheric neutrino data from the Super-Kamiokande experiment, the authors find new limits on the sterile neutrino oscillations.

http://www-sk.icrr.u-tokyo.ac.jp/sk/_pdf/articles/PhysRevD.91.052019.pdf

Limits on sterile neutrino mixing using atmospheric neutrinos in Super-Kamiokande

Gadolinium-loading of large water Cherenkov detectors is a prime method for the detection of the Diffuse Supernova Neutrino Background (DSNB). While the enhanced neutron tagging capability greatly reduces single-event backgrounds, correlated events mimicking the IBD coincidence signature remain a potentially harmful background. Neutral-Current (NC) interactions of atmospheric neutrinos potentially dominate the DSNB signal especially in the low-energy range of the observation window that reaches from about 12 to 30 MeV. 
The present paper investigates a novel method for the discrimination of this background. Convolutional Neural Networks (CNNs) offer the possibility for a direct analysis and classification of the PMT hit patterns of the prompt events. Based on the events generated in a simplified SuperKamiokande-like detector setup, we find that a trained CNN can maintain a signal efficiency of 96 % while reducing the residual NC background to 2 % of the original rate. Comparing to recent predictions of the DSNB signal and measurements of the NC background levels in Super-Kamiokande, the corresponding signal-to-background ratio is about 4:1, providing excellent conditions for a DSNB discovery.

CNNs for enhanced background discrimination in DSNB searches in large-scale water-Gd detectors

The R3B experiment investigates the structure of exotic nuclei far off stability in inverse kinematics. A major component is the e.m. calorimeter CALIFA. In this work, a benchmark experiment with included simulation package was developed using quasi-free (p,2p) reactions in direct kinematics. The concept was tested during an in-beam experiment in Krakow, Poland.

Development of a CALIFA demonstrator benchmark experiment using (p,2p) reactions in direct kinematics

Next generation nucleon decay and neutrino detectors using ring imaging water Cherenkov technique are discussed Focus is on the basic performance of the detectors, rich physics topics to be covered, and ongoing feasibility studies

Large Underground Water Cherenkov Detectors

We report the first measurement of the neutrino-oxygen neutral-current quasielastic (NCQE) cross section. It is obtained by observing nuclear deexcitation γ rays which follow neutrino-oxygen interactions at the Super-Kamiokande water Cherenkov detector. We use T2K data corresponding to 3.01×1020 protons on target. By selecting only events during the T2K beam window and with well-reconstructed vertices in the fiducial volume, the large background rate from natural radioactivity is dramatically reduced. We observe 43 events in the 4–30 MeV reconstructed energy window, compared with an expectation of 51.0, which includes an estimated 16.2 background events. The background is primarily nonquasielastic neutral-current interactions and has only 1.2 events from natural radioactivity. The flux-averaged NCQE cross section we measure is 1.55×10−38  cm2 with a 68% confidence interval of (1.22,2.20)×10−38  cm2 at a median neutrino energy of 630 MeV, compared with the theoretical prediction of 2.01×10−38  cm2.

pdf/measurement-of-the-neutrino-oxygen-neutral-current-28ykqhytfy.pdf

Measurement of the neutrino-oxygen neutral-current interaction cross section by observing nuclear deexcitation γ rays

De-excitation gamma-rays from the s-hole state in N-15 associated with proton decay in O-16

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De-excitation gamma-rays from the s-hole state in N-15 associated with proton decay in O-16