P01 : Sei Ban
Performance of the prototype detector of AXEL.

P02 : Wei Min Chan
Study of Ta-180m Decay by Ultra-low Background HPGe Detector

P03 : Takahiko Hachiya
Background Status of KamLAND-Zen 800

P04 : Takashi Iida
Development and performance evaluation of CaI2 scintillator crystal for dark matter search

P05 : Kohei Kamizawa
Liquid scintillator development for KamLAND2-Zen

P06 : Xiaolong Li
Development of Light Detector in CANDLES Scintillating Bolometer

P07 : Tsuyoshi Maeda
Study of Pulse Shape Discrimination circuit

P08 : Alejandro Mora
Geant4 Simmulation for Low Background Axion-WIMPs detection

P09 : Kiseki Nakamura
Simulation of electroluminescence process and background rejection in AXEL experiment

P10 : shuhei OBARA
New balloon installation for KamLAND-Zen 800

P11 : Tatsuki Ose
Development of Low Background Construction for Axion Search with SOI pixel Detector

P12 : Yutaka Shirahata
Development for Neutrino Directional Measurement in Liquid Scintillator

P13 : Masoumeh Shokati Mojdehi
Alpha Event Analysis for CANDLES

P14 : konosuke tetsuno
Development of bolometer for 48Ca neutrinoless double beta decay search

P15 : Atsuhiro Umemoto
NEWS ~Nuclear Emulsions for WIMP Search~

P16 : Thi Thu Trang Van
Development of new calibration method using 24Na source for CANDLES

P17 : Chan Fai Wong
The impact of reactor spectrum on the sensitivity of neutrino mass hierarchy identification

P18 : Ryota Yakabe
Direction-sensitive dark matter search with μ-TPC

P19 : Hisataka Yoshida
μ - e Conversion Search in COMET Experiment and See-Saw Scenarios

P01 : Sei Ban
Performance of the prototype detector of AXEL.
AXEL (A Xenon ElectroLuminescence detector) is a high pressure xenon gas Time Projection Chamber(TPC) being developed for neutrinoless double- beta decay search.We use proportional scintillation mode with a new electroluminescence(EL) light detection scheme to achieve very high energy resolution with a large detector: our target is 0.5%FWHM at 2458keV i.e. Q-value of 0nbb decay of 136 Xe. The detector also has a capability of tracking to reduce background. The project is in a R&D phase. We’ve constructed a prototype chamber with 10 L and up to 10 bar Xe gas. This prototype has φ10 cm × 9cm sensitive volume and 8×8 readout channel. We evaluated the performance of AXEL prototype detector. I will report the results with 10 bar pressured xenon gas and 22Na gamma-ray source (511 keV).

P02 : Wei Min Chan
Study of Ta-180m Decay by Ultra-low Background HPGe Detector
Among all isotopes, Ta-180m is the only isomer existing and the rarest stable nuclide in the solar system. The nucleosynthetic history of this isomer has remained an unsolved puzzle and its half-life is not determined until now. The purpose of this research is to detect the Ta-180m decay by utilized HPGe detector of CANDLES Collaboration at Kamioka Underground Observatory. In particular, we aim to accomplish ultra-low background condition by optimize the external shields, remove impurity of tantalum sample, and develop pulse shape discrimination for coaxial HPGe detector. Physics runs of 306 days and 58 days has been accumulated from the Phase I and Phase II tantalum measurement. The experiment set up, pulse shape analysis and result of Ta-180m study will be presented.

P03 : Takahiko Hachiya
Background Status of KamLAND-Zen 800
KamLAND-Zen 800 is an experiment which searches for neutrino-less double-beta-decay using 750 kg of enriched Xe by dissolving Xe into liquid scintillator. In August of 2016, installation of 25 micro-meter-thick-nylon-vessel (mini-balloon) which holds Xe-dissolved liquid scintillator (Xe-LS) was performed. KamLAND-Zen 400, former smaller-size experiment, faced background-event from beta-decay of 214Bi, which occurred around film of mini-balloon. Therefore, mini-balloon of KamLAND-Zen 800 was constructed in cleaner way as compared to that of KamLAND-Zen 400 aiming reduction of 214Bi-background. In this poster, I report background status of KamLAND-Zen 800 using data acquired from Xe-non-dissolved period.

P04 : Takashi Iida
Development and performance evaluation of CaI2 scintillator crystal for dark matter search
Detection of dark matter would reveal the history of formation of large-scale structure in the universe. Inorganic scintillator detector, such as NaI scintillator, is one of the major techniques for direct dark matter detection. We have been developing calcium iodide (CaI2) scintillator which has more than twice larger light yield compared with NaI scintillator for the purpose of future dark matter experiment. Although CaI2 has very good properties as a scintillator, it is not commonly used due to its deliquescence and cleavability. In May 2016, we have grown a one inch size CaI2 crystal using Bridgman crystallization furnace in Institute for Materials Research, Tohoku University. In this presentation, we discuss a result of performance evaluation for CaI2 scintillator.

P05 : Kohei Kamizawa
Liquid scintillator development for KamLAND2-Zen
KamLAND2-Zen is upgrade experiment of KamLAND-Zen that is search for neutrinoless double beta-decay with 136Xe. In KamLAND2-Zen experiment , we aim at the improvement of the energy resolution by the light yield increase . For the light yield increase , we research and develop the light collecting mirror and High QE PMT , new brighter liquid scintillator . By giving these development on a detector , we expect that improve energy resolution for 2nu background reduction . After achievement of this energy resolution , we increase Xe to 1ton and aim at the effective mass sensitivity goal ~ 20 meV by 5-years observation . For the practical use by KamLAND2-Zen , I study the optical purification of new liquid scintillator using the activated charcoal.

P06 : Xiaolong Li
Development of Light Detector in CANDLES Scintillating Bolometer
CANDLES is developing scintillating bolometer using CaF2(pure) crystals for the search of neutrino-less double beta decay and dark matter. The first development phase is being carried out at the ground laboratory in Osaka University, Japan. The scintillating bolometer consists of heat detector using CaF2 crystal to measure the energy of radiation particle, and light detector using high purity Ge wafer to reject background with ratio of light signal to heat signal. Temperature rise of Ge wafer from the scintillation of CaF2 crystal is measured by NTD Ge thermistor at 10 mK. The light collection is improved by an anti-reflective SiO2 layer and a 4π PTFE reflector. In the poster, design of the light detector and thermodynamic simulation results of the scintillating bolometer are reported.

P07 : Tsuyoshi Maeda
Study of Pulse Shape Discrimination circuit
CANDLES try to measure neutrino mass at the world's best sensitivity. The detector has the structure that sank a large quantity of CaF2 crystals to a liquid scintillator. These are surrounded by PMTs and operated by a Trigger・DAQ system which can gather signals from all crystals. In this poster, we will present our new trigger system which is suitable for the current and future CANDLES detector.

P08 : Alejandro Mora
Geant4 Simmulation for Low Background Axion-WIMPs detection
Current status of a Geant 4 simmulation to improve the low background shielding for dark matter and Axion detection experiments. The Axion detection is done using the M1 transition of 57Fe isotope in the sun; the detector is set up inside a shielded cavity, and cooled to a temperature of 188 K; an air cleaner and a cosmic rays event counter are also included. The WIMP detection is done thorugh direct interaction of the WIMP particles with the detector material. The detector is the XRPIX, a pixel SoI detector.

P09 : Kiseki Nakamura
Simulation of electroluminescence process and background rejection in AXEL experiment
AXEL (A Xenon ElectroLuminescence detector) group is developing a time projection chamber filled with high pressure xenon gas. The detector can potentially achieve high energy resolution, large target mass and strong background rejection power by tracking. We are developing a new readout scheme where light-emitting region is divided to cells and emitted lights are detected by MPPCs cell by cell. After the development of the small prototype detector, we construct the large prototype detector in order to study detector performance at Q-value (2.5MeV). We will report on the simulation study to optimize detector as the following two point. One is to obtain good background rejection power using tracking, and the other is to obtain sufficient EL photons estimated by electric field calculation.

P10 : shuhei OBARA
New balloon installation for KamLAND-Zen 800
Neutrinoless double beta decay search experiment "KamLAND-Zen" is going to next phase "KamLAND-Zen 800" with 750 kg 136Xe. For less radioactivities on mini-balloon and larger radius, we started to constructed new mini-balloon before 1 or more year. At August, we finally installed new mini-balloon in the KamLAND detector, and filled with liquid scintillator without xenon. Xenon loaded liquid scintillator will be installed soon. In this presentation, new mini-balloon construction, installation, and current status will be reported.

P11 : Tatsuki Ose
Development of Low Background Construction for Axion Search with SOI pixel Detector
We search the solar hadronic axion using M1 transition of 57Fe isotope. The detectable signal is 14.4 keV X-ray and we use the XRPIX, which is Silicon On Insulator (SOI) pixel detector. Since the interaction between axion and iron is very rare, ultra-low background facility is needed in this experiment. We study our equipment and shielding from the environmental radioactivity. The setup is made as simple as possible. Our experiment is on earth and the detector is cooled to -85 ℃ in a cryostat in atmospheric pressure. To suppress external radioactivity, we prepare shield, air cleaner and cosmic ray veto counter. Shielding material and thickness optimization were done by CdTe detector offering simple setup and sufficient performance. We present the recent progress of the experiment.

P12 : Yutaka Shirahata
Development for Neutrino Directional Measurement in Liquid Scintillator
Liquid scintillator (LS) detectors have a good sensitivity to low energy anti-neutrino. However, LS detectors aren't sensitive to the direction. Directional sensitive LS detector will contribute to better understanding of the Earth’s interior in kton scale detector. Anti-neutrinos are detected by inverse beta decay and tagged by delayed coincidence method. Although emitted neutron retains directional information of anti-neutrino, current LS cannot identify the neutron capture point before directional information is lost. Li-loaded LS has the ability to shorten the capture range because of large neutron capture cross section of 6Li. The optical discrimination of energy deposit point by imaging device is also required. In my poster, development status of detectors will be reported.

P13 : Masoumeh Shokati Mojdehi
Alpha Event Analysis for CANDLES
CANDLES detector consists of 62 PMTs with light guide and 96 CaF2 crystals in 6 layers which are different in position, quenching factor and radioactivity. Between different types of events which can be detected by this detector there are alpha events that emitted from U-series and Ac-series within each CaF2 scintillation crystals. Hence the alpha event analysis could play a significant role in indicating the performance of the detector and impurities within each crystals. In addition the alpha event list is utilized for PSD analysis which is one of the important tools to analyze background of particles detector. For this purpose we have analyzed alpha event for data which was taken from new configuration of the CANDLES by using identification method for 214Po and 215Po alpha events.

P14 : konosuke tetsuno
Development of bolometer for 48Ca neutrinoless double beta decay search
CANDLES is a project to search for 0νββ of 48Ca with CaF2 scintillators. The CANDLES detector is currently running with 300kg CaF2 crystals in the Kamioka Underground Observatory, Japan. In 0νββ search, it is very important to develop the high energy resolution detector especially to avoid inevitable 2νββ background events. Therefore, we plan to use the CaF2 bolometer which is able to achieve excellent energy resolution by detect heat signal. We aim to achieve 0.5% (FWHM) energy resolution at the Q-value using neutron transmutation doped germanium thermistors. At present, we are developing a small bolometer with several hundred grams of CaF2 crystals in the surface laboratory. In this poster, the current status of development and future strategy of our bolometer will be reported.

P15 : Atsuhiro Umemoto
NEWS ~Nuclear Emulsions for WIMP Search~
NEWS is a directional dark matter search experiment by using nuclear emulsion. Until now, we have understood the detector characteristic about the detection efficiency and angular resolution of signal track and also improve the method for noise reduction. And we start the first underground measurement in September 2016 at LNGS laboratory in Italy. In this poster, I will show them and a future planning.

P16 : Thi Thu Trang Van
Development of new calibration method using 24Na source for CANDLES
The CANDLES experiment at the Kamioka underground observatory is a project to research for the neutrinoless double beta (0νββ) decay of 48Ca. The Q-value of 48Ca is the highest (4.27MeV) among all ββ decay nuclei. Naturally, we can expect small background in the region of interest. A precise energy calibration at Q-value of 48Ca is crucial for the identification of candidate 0νββ events. We have been using an 88Y radioactive source that emits two γ-rays (0.89MeV and 1.84MeV) to calibrate energy. However, the calibration can be improved by a new calibration γ-ray source with higher γ-ray energies. A new energy calibration system of the radioactive source 24Na by neutron activation which emits two higher γ-rays (1.37MeV and 2.75MeV) is being developed.

P17 : Chan Fai Wong
The impact of reactor spectrum on the sensitivity of neutrino mass hierarchy identification
Up to now, the reactor neutrino flux is not precisely determined yet. Generally speaking, the uncertainty of reactor flux would cause problems to reactor neutrino experiment. The previous calculation of beta decay spectrum estimates that the uncertainties of electron anti-neutrino flux would be around a few percent. However, recently, there are studies suggest that the uncertainties may have been underestimated.

P18 : Ryota Yakabe
Direction-sensitive dark matter search with μ-TPC
NEWAGE is a direction-sensitive direct dark matter search experiment with μ-TPC. The μ-TPC is a three dimensional gaseous tracking detector using μ-PIC as two dimensional detector which has orthogonally-formed readout strips with a pitch of 400 μm. Our goals are detection of dark matter–nucleus scattering signal within μ-TPC and investigation of the characteristics of the kinematics of dark matter in the Galaxy. Our direction-sensitive dark matter search has been performed in Kamioka underground laboratory. In this talk , I will present the latest our result of direct dark matter search and our future plan.

P19 : Hisataka Yoshida
μ - e Conversion Search in COMET Experiment and See-Saw Scenarios
COMET is an experiment to search for (neutrinoless) μ - e conversion, which is Charged Lepton Flavor Violating (CLFV) process, will be performed at J-PARC in near future. The COMET aims to reach the sensitivity of 10^-17 as branching ratio of μ - e conversion, where the CLFV processes are effective in various beyond the Standard Models, such as SUSY and See-Saw mechanism. The search might provide something valuable for the See-Saw mechanisms, also neutrino mass scale and hierarchy similar to search for neutrinoless double beta decay(DBD). An unique model called "inverse seesaw" predicts the enhance effects on the processes of neutrinoless DBD and μ - e conversion. The poster presents an overview and status of COMET experiment and theoretical prediction for μ - e conversion with some See-Saw scenarios.