S. Kuwasaki

TL;DR: In this article, the total cross sections were measured for coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV for the first time.

Abstract: The second GeV bremsstrahlung photon beamline has been constructed for meson photo-production experiments at Research Center for Electron Photon Science, Tohoku University, where a 1200 MeV electron synchrotron called STretcher Booster (STB) has been in operation primarily for Quark Nuclear Physics. An internal radiator is employed to produce the bremsstrahlung photon beam out of circulating electrons in the STB ring. A photon tagging system is placed inside one of the bending magnets of the ring. The tagged energy of the photon beam ranges from 740 to 1150 MeV for 1200 MeV operation of the STB synchrotron. The details of the tagging system and the characteristics of the photon beam are described.

TL;DR: In this article, the authors show strong evidence for the existence of an isovector dibaryon resonance with a mass of 2.14 ± 0.01 GeV / c 2, which is consistent with the theoretically predicted D 12 state, and also with the energy dependence of the πd partial-wave amplitude P 2 3 for the γ d → π ± d and π + d → p p reactions.

TL;DR: An electromagnetic calorimeter complex, FOREST, was constructed for meson photoproduction experiments at the Research Center for Electron Photon Science, Tohoku University.

TL;DR: In this paper, a performance test has been made for an electro-magnetic calorimeter prototype comprised four identical BSO crystals arranged in a 2×2 matrix by utilizing a positron beam in the energy range from 100 to 800 MeV.