Yifang Wang

Experimental Requirements to Determine the Neutrino Mass Hierarchy Using Reactor Neutrinos

This paper presents experimental requirements to determine the neutrino mass hierarchy using reactor neutrinos. The detector shall be located at a baseline around 58 km from the reactor(s) to measure the energy spectrum of electron antineutrinos ((nu)over bar(e)) precisely. By applying Fourier cosine and sine transforms to the L/E spectrum, features of the neutrino mass hierarchy can be extracted from the vertical bar Delta m(31)(2)vertical bar and vertical bar Delta m(32)(2)vertical bar oscillations. To determine the neutrino mass hierarchy above 90% probability, requirements to the baseline, the energy resolution, the energy scale uncertainty, the detector mass, and the event statistics are studied at different values of sin(2)(2 theta(13)).

Production of a gadolinium-loaded liquid scintillator for the Daya Bay reactor neutrino experiment

We report on the production and characterization of liquid scintillators for the detection of electron antineutrinos by the Daya Bay reactor neutrino experiment. A 185 tons of gadolinium-loaded (0.1% by mass) liquid scintillator (Gd-LS) and a 200 tons of unloaded liquid scintillator (LS) were successfully produced from a linear-alkylbenzene (LAB) solvent in 6 months. The scintillator properties, the production and purification systems, and the quality assurance and control (QA/QC) procedures are described

PMT waveform modeling at the Daya Bay experiment

Detailed measurements of Hamamatsu R5912 photomultiplier signals are presented, including the single photoelectron charge response, waveform shape, nonlinearity, saturation, overshoot, oscillation, prepulsing, and afterpulsing. The results were used to build a detailed model of the PMT signal characteristics over a wide range of light intensities. Including the PMT model in simulated Daya Bay particle interactions shows no significant systematic effects that are detrimental to the experimental sensitivity.

MOMENT: a muon-decay medium-baseline neutrino beam facility

Neutrino beam with about 300 MeV in energy, high-flux and medium baseline is considered a rational choice for measuring CP violation before the more powerful Neutrino Factory will be built. Following this concept, a unique neutrino beam facility based on muon-decayed neutrinos is proposed. The facility adopts a continuous-wave proton linac of 1.5 GeV and 10 mA as the proton driver, which can deliver an extremely high beam power of 15 MW. Instead of pion-decayed neutrinos, unprecedentedly intense muon-decayed neutrinos are used for better background discrimination. The schematic design for the facility is presented here, including the proton driver, the assembly of a mercury-jet target and capture superconducting solenoids, a pion/muon beam transport line, a long muon decay channel of about 600 m and the detector concept. The physics prospects and the technical challenges are also discussed.

Optimum long baseline for the next generation neutrino oscillation experiments

For high-energy long baseline neutrino oscillation experiments, we propose a figure of merit criterion to compare the statistical quality of experiments at various baseline lengths under the condition of identical detectors and a given neutrino beam. We take into account all possible experimental errors under general consideration. In this way, the figure of merit is closely related to the usual statistical criterion of number of sigmas. We use a realistic neutrino beam for an entry-level neutrino factory and a possible superbeam from a meson source and a 100 kt detector for the calculation. We consider in detail four baseline lengths\char22{}300 km, 700 km, 2100 km, and 3000 km in the neutrino energy range of 0.5\char21{}20 GeV for a 20 GeV entry-level neutrino factory and a 50 GeV superbeam. We find that the very long baselines of 2100 km and 3000 km are preferred for the neutrino factory according to the figure of merit criterion. Our results also show that, for a neutrino factory, lower primary muon energies such as 20 GeV are preferred rather than higher ones such as 30 or 50 GeV. For the superbeam, the combination of a long baseline such as 300 km and a very long baseline such as 2100 km will form a complete measurement of the oscillation parameters in addition to the

Rayleigh scattering of linear alkylbenzene in large liquid scintillator detectors

\mathrm{CP}

Fast light of CsI(Na) crystals

phase. To measure the

Physics potential of searching for

\mathrm{CP}

0\nu\beta\beta

phase in a superbeam, a larger detector (a factor 3 beyond what is considered in this paper) and/or a higher intensity beam will be needed to put some significant constraints on the size of the

decays in JUNO

\mathrm{CP}