K. Hamada

Comprehensive track reconstruction tool "NETSCAN 2.0'' for the analysis of the OPERA Emulsion Cloud Chamber

NETSCAN is a track reconstruction algorithm used in Emulsion Cloud Chambers (ECC). NETSCAN and Emulsion Cloud Chambers were used in the DONUT experiment to detect Tau-neutrinos interactions. The algorithm has been revised in order to cope with the OPERA event analysis performed in Japan. A new version of NETSCAN was necessary to effectively analyze the most massive emulsion experiment in history with limited resources.

Measurement of low-energy neutrino cross-sections with the PEANUT experiment

The PEANUT experiment was designed to study the NuMi neutrino beam at Fermilab. The detector uses a hybrid technique, being made of nuclear emulsions and scintillator trackers. Emulsion films act as a micrometric tracking device and are interleaved with lead plates used as passive material. The detector is designed to precisely reconstruct the topology of neutrino interactions and hence to measure the different contributions to the cross section. We present here the full reconstruction and analysis of 147 neutrino interactions and the measurement of the quasi-elastic, resonance and deep-inelastic contributions to the total charged current cross section at the energies of the NuMi neutrino beam. This technique could be applied for beam monitoring in future neutrino facilities, and this paper shows its proof-of-principle.

Measurement of Cosmic Ray Nuclei with GRAINE2015

GRAINE(Gamma Ray Astro-Imager with Nuclear Emulsion) experiment consists of a balloon borne emulsion chamber and emulsion film shifting system launched on May 6, 2015 in Australia and its acceptance and flight duration is 3780m

The OPERA film: New nuclear emulsion for large-scale, high-precision experiments

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Time stamp technique using a nuclear emulsion multi-stage shifter for gamma-ray telescope

sr and 14 hours at 37 km above sea level, respectively. The main scientific goals of GRAINE2015 are the precise measurement of sub GeV gamma-rays from Vela pulsar, the measurement of charm particle production cross section at high altitude in the air and the study of cosmic ray nuclei compositions. The nuclear emulsion films used in GRAINE2015 will be able to measure cosmic ray nuclei from hydrogen nuclei to more than iron nuclei. The measurement of the chemical composition of cosmic ray nuclei in the MeV-TeV energy range will reveal new insights about the cosmic ray nuclei life in the our galaxy, from their origin to the propagation in the interstellar medium. The Cosmic ray nuclei absolute charge Z is measured along the trajectory in the GRAINE2015 emulsion films by using high speed emulsion track selector (HTS). This allows to scan the entire emulsion film within the zenith angle less than 63 degree. The charge measurement methods in HTS scan data are here explained, and their performance presented.