Development of a cryogenic gas target for intense RI beam production at CRIB

摘要

Nuclear reactions of astrophysical interest, especially those under high-temperature and high-density conditions, require high-intensity low-energy radioactive ion beams, because the cross-sections are very small for the direct method study. Production of high-intensity radioactive ion beams is, therefore, one of the key developments for RI beam facilities.rnWe report the development of a new cryogenic RI beam production gas target, along with its characteristics and performance. Some of its advantages are the increased stability against high-current primary beams and the increased thickness due to the cooling by liquid nitrogen.rnThe target is being tested with heavy-ion beams. Measures by energy loss of the beam indicate that a thickness of about 2.4mg/cm~2 of H_2 gas has been attained and a secondary beam of ~7Be~(4+) at 4.0 MeV/w of more than 2 × 10~8 pps was produced.