S. Mikado

Study of hadron interactions in a lead–emulsion target

Topological and kinematical characteristics of hadron interactions have been studied using a lead-emulsion target exposed to 2, 4 and 10 GeV/c hadron beams. A total length of 60 m

Automatic track recognition for large-angle minimum ionizing particles in nuclear emulsions

\pi^-

First neutrino event detection with nuclear emulsion at J-PARC neutrino beamline

tracks was followed using a high speed automated emulsion scanning system. A total of 318 hadron interaction vertices and their secondary charged particle tracks were reconstructed. Measurement results of interaction lengths, charged particle multiplicity, emission angles and momenta of secondary charged particles are compared with a Monte Carlo simulation and appear to be consistent. Nuclear fragments emitted from interaction vertices were also detected by a newly developed emulsion scanning system with wide-angle acceptance. Their emission angle distributions are in good agreement with the simulated distributions. Probabilities of an event being associated with at least one fragment track are found to be greater than 50% for beam momentum

A Test Experiment to Develop a Neutrino Detector with Emulsions for Neutrino-Nucleus Cross Section Measurements at J-PARC

P > 4

First demonstration of an emulsion multi-stage shifter for accelerator neutrino experiments in J-PARC T60

GeV/c and are well reproduced by the simulation. These experimental results validate estimation of the background due to hadron interactions in the sample of

Selective boron delivery by intra-arterial injection of BSH-WOW emulsion in hepatic cancer model for neutron capture therapy

\tau

Automatic scanning of nuclear emulsions with wide-angle acceptance for nuclear fragment detection

decay candidates in the OPERA

Application of neutron capture autoradiography to Boron Delivery seeking techniques for selective accumulation of boron compounds to tumor with intra-arterial administration of boron entrapped water-in-oil-in-water emulsion

\nu_{\mu} \to \nu_{\tau}

A thin emulsion spectrometer using a compact permanent magnet

oscillation experiment.

A new method to correct deformations in emulsion using a precise photomask

We previously developed an automatic track scanning system which enables the detection of large-angle nuclear fragments in the nuclear emulsion films of the OPERA experiment. As a next step, we have investigated this systems track recognition capability for large-angle minimum ionizing particles (1.0 ≤ |tan θ| ≤ 3.5). This paper shows that, for such tracks, the system has a detection efficiency of 95% or higher and reports the achieved angular accuracy of the automatically recognized tracks. This technology is of general purpose and will likely contribute not only to various analyses in the OPERA experiment, but also to future experiments, e.g. on low-energy neutrino and hadron interactions, or to future research on cosmic rays using nuclear emulsions carried by balloons.