A windowless gas target for secondary beam production

A windowless gas target was developed for the production of secondary high-spin isomer beams (HSIB). An 16 O target in the compound form of CO2 gas was used to produce a 145 m Sm beam by using an 16 O ( 136 Xe , 7n) 145 m Sm reaction. The target gas pressure was kept constant at 50 Torr. A target thickness of about 1 mg/cm2 was achieved with a 10 cm target length. Gas was recirculated and the consumption was very little.