Author/Authors :
Ohgaki، نويسنده , , H and Noguchi، نويسنده , , T and Sugiyama، نويسنده , , S and Mikado، نويسنده , , T and Chiwaki، نويسنده , , M and Yamada، نويسنده , , K and Suzuki، نويسنده , , R and Sei، نويسنده , , N and Ohdaira، نويسنده , , T and Yamazaki، نويسنده , , T، نويسنده ,
Abstract :
Completely polarized gamma-rays can be generated by Compton backscattering of laser light. The energy of the polarized gamma-rays ranges from 1 to 10 MeV by using a Nd:YAG laser and the storage ring TERAS at Electrotechnical Laboratory. The energy spread of the gamma-rays varies from 1 to 4% according to its energy. The gamma-ray yield is measured to be 47.2 photons mA−1 W 1s−1. By using these polarized gamma-rays elastically scattered photons have been measured. The parity of the J = 1 level in 208Pb (EX = 5.514 MeV) was clearly determined to be negative and the parity of the J = 1 level in 11B (EX = 4.4451 MeV), on even-odd nucleus, was also measured to be negative. Further development in the SR-FEL will allow us to use ∼107 gamma-rays.
