A Long Baseline Neutrino Oscillation Experiment Using J-PARC Neutrino Beam and Hyper-Kamiokande

Document submitted to 18th J-PARC PAC meeting in May 2014. 50 pages, 41 figuresDocument submitted to 18th J-PARC PAC meeting in May 2014. 50 pages, 41 figuresDocument submitted to 18th J-PARC PAC meeting in May 2014. 50 pages, 41 figuresHyper-Kamiokande will be a next generation underground water Cherenkov detector with a total (fiducial) mass of 0.99 (0.56) million metric tons, approximately 20 (25) times larger than that of Super-Kamiokande. One of the main goals of Hyper-Kamiokande is the study of $CP$ asymmetry in the lepton sector using accelerator neutrino and anti-neutrino beams. In this document, the physics potential of a long baseline neutrino experiment using the Hyper-Kamiokande detector and a neutrino beam from the J-PARC proton synchrotron is presented. The analysis has been updated from the previous Letter of Intent [K. Abe et al., arXiv:1109.3262 [hep-ex]], based on the experience gained from the ongoing T2K experiment. With a total exposure of 7.5 MW $\times$ 10$^7$ sec integrated proton beam power (corresponding to $1.56\times10^{22}$ protons on target with a 30 GeV proton beam) to a $2.5$-degree off-axis neutrino beam produced by the J-PARC proton synchrotron, it is expected that the $CP$ phase $\delta_{CP}$ can be determined to better than 19 degrees for all possible values of $\delta_{CP}$, and $CP$ violation can be established with a statistical significance of more than $3\,\sigma$ ($5\,\sigma$) for $76$ ($58$) of the $\delta_{CP}$ parameter space

Influence of Radiation Damage on the Performance

The influence of radiation damage on energy resolution, linearity and uniformity of an electromagnetic lead/scintillator calorimeter was studied experimentally with 1--6 GeV electrons. Plastic scintillators and wavelength shifter bars were irradiated uniformly with # rays. Both were identical with those of the ZEUS uranium calorimeter. The attenuation length of the scintillators was determined from bench tests of single scintillator tiles and from beam tests of the whole calorimeter. After exposure to a dose of 10 kGy the attenuation length of the scintillators decreased by a factor of 2. The experimental results show that the irradiation of the nearly 2 m long wavelength shifter bars a#ects the calorimeter much more than the damage of the scintillators which were only 19 cm long. Damaged and undamaged sections of the calorimeter were scanned with a moving radioactive # source ( Co). The results demonstrate that the Co monitor system is a very precise tool to detect radiation damage in a sampling calorimeter

Stable isotope composition of water in desert plants.

A survey of the stable isotope content of tissue waters of plants from the Negev desert was conducted. Large differences were observed in the extent of enrichment of the heavy isotopes in leaf water relative to local precipitation among different plants. This is apparently caused by the species-dependent stratagems adopted by the plants to cope with water stress, primarily by differences in the depth of water uptake in the soil and through the timing of stomatal openings during the daily cycle. Salt stressed plants showed extreme variability in the isotopic composition of leaf-water. The results show that plants with adaptation to arid conditions can avoid the transpiration regime, which would lead to the strong isotopic enrichment in their leaf water expected under arid conditions. This has implications for the use of stable isotopes in plants as indicators of either plant ecophysiology or paleoclimate

PRODUCTION IN Pb-Pb AND p-Pb INTERACTIONS AT 158 A

The WA85, WA94 and WA97 experiments at the CERN OMEGA spectrometer have studied the production of strange and multistrange particles in both nucleus-nucleus and protonnucleus reactions as a possible signature of a quark-gluon plasma phase. Recent results from WA97 on , \Xi and\Omega production in Pb-Pb and p-Pb collisions at 158 A GeV/c are presented. The enhancement of strange baryon production, observed when going from proton to nucleus initiated reactions, will be discussed. 1 Introduction In collisions of heavy nuclei at relativistic energy the nuclear matter is compressed and significantly excited. In such extreme conditions novel physical phenomena can arise and it is believed that the quarks confined in hadrons can dissolve forming a macroscopic space time region filled with free quarks and gluons: the quark gluon plasma state of matter (QGP). One of the sensitive signatures for the phase transition to a QGP state is the enhanced yield of strange particles in nucleus-nucleus ..