First Beam Observation and Near Future Plans at SPring-8 LEPS2 Experiments

TL;DR

The paper reports the successful production of the first photon beam at SPring-8 LEPS2, highlighting the upgraded beam intensity and the setup of advanced detectors for future nuclear physics experiments.

Contribution

It introduces the new LEPS2 beamline at SPring-8, detailing the first beam observation and the planned experimental apparatus for future research.

Findings

First photon beam produced at LEPS2

Setup of BGOegg calorimeter and charged particle spectrometer

Plans for physics programs including eta'-bound nuclei searches

Abstract

The first photon beam was successfully produced by laser Compton backscattering at the LEPS2 beamline, which was newly constructed at SPring-8 for the purpose to increase the beam intensity one order of magnitude more than that of the LEPS experiments and to achieve the large acceptance coverage with high resolution detectors. The BGOegg electromagnetic calorimeter with associated detectors are being set up at the LEPS2 experimental building for the physics programs, including the searches for $\eta$'-bound nuclei and highly excited baryon resonances. In parallel to the BGOegg experiments, the LEPS2 charged particle spectrometer will be prepared inside the 1 Tesla solenoidal magnet, transported from the BNL-E949 experiment.