报告题目：Hadron Physics Experiments with Photon Beams at LEPS and LEPS2

报 告 人：Masaru Yosoi (Osaka University，Spokesperson of LEPS)

报告时间：2015年6月9日（星期二）上午9：30-11：00

报告地点：张江办公楼109会议室

报告简介：

The Laser-Electron-Photon facility at SPring-8 (LEPS) is a unique and very successful facility with the cleanest photon beam in the world at multi-GeV energies. The photon beam produced by means of laser-induced backward Compton scattering (BCS) from 8 GeV electrons has rather flat energy distribution with small spreading angles, unlike the Bremsstrahlung beam which has huge low-energy photons. The beam polarization is also high and nearly 100% at the maximum energy. Polarization observables play an important role to elucidate the photo-production mechanism. The LEPS experiments have been carried out since 2000 mainly using the forward charged-particle spectrometer to search for the pentaquark, and to study the ?-meson production, hyperon photoproduction, etc. I will introduce the LEPS facility and present some results of the LEPS experiments.

A new project to construct the second beamline at SPring-8 (LEPS2) was started several years ago. The LEPS2 improves the intensity of the photon beam and expands the detector acceptance by adopting a large solenoid magnet, which was originally used in the BNL-E949 experiment. The first photon beam has successfully been produced at the LEPS2 beamline in January 2013 and we have started the first physics run from 2014. I will also present the brief view of the LEPS2 system and the current status.

报告人简介：

Masaru YOSOI， Research Center for Nuclear Physics, Osaka University. (Spokesperson of the LEPS/LEPS2)

Education

April 1977 – March 1981 Department of Physics, Faculty of Science, Kyoto University
April 1981 – March 1983 Department of Physics II, Graduate School of Science [Master Course], Kyoto University
April 1983 – March 1988 Department of Physics II, Graduate School of Science [Doctor Course], Kyoto University
Degree
March 2003 Doctor of Science (Kyoto University)
“Structures and fragmentations of the deep-hole state in 11B and 15N”
Professional Career
April 1986 – March 1988 Research Fellowship for Young Scientists, Japan Society for the Promotion of Science (JSPS)
April 1988 – March 1989 Research Assistant, Research Center for Nuclear Physics, Osaka University
April 1989 – March 1991 Research Associate, Department of Physics, Faculty of Science, Tokyo Institute of Technology
April 1991 – March 1995 Instructor, Faculty of Science, Kyoto University
April 1995 – March 1999 Instructor, Graduate School of Science, Kyoto University
April 1999 – March 2001 Research Associate, Research Center for Nuclear Physics, Osaka University
April 2001 – April 2005 Instructor, Graduate School of Science, Kyoto University
May 2005 – July 2013 Associate Professor, Research Center for Nuclear Physics, Osaka University
July 2013 – up to now Professor, Research Center for Nuclear Physics, Osaka University (Spokesperson of the LEPS/LEPS2)
Research Interests
Search for exotic states of hadrons/ Study of mesons in nuclei/ Polarization phenomena in nuclear and hadron physics/ Developments of new detector systems/ Production of high energy photon beam by Laser-Compton scattering