New initiatives of in-beam spectroscopy at RIBF

The RI Beam Factory (RIBF) is a third-generation in-flight facility, designed and optimized for the RI beam production by uranium fission. High intensity beams available over a wide region of the nuclear chart creates great opportunities for in-beam reaction studies at the energies around 200 to 300 MeV/u. Furthermore, three spectrometers, namely ZeroDegree, Samurai and SHARAQ/OEDO each having specific advantages, give rise to a wider spectrum of reaction studies at the RIBF. The area of reaction studies has been advanced further by new initiatives since the last meeting at Hawaii. One is that the energy-degrading RI beamline OEDO has been set for full operation. OEDO decelerates RI beams in-flight down to about 10 MeV/u, thus providing the energy tunability to bolster the versatility of reactions, which is limited at original beam energies of the RIBF. Another initiative is the HiCARI campaign at ZeroDegree, which introduced tracking-type germanium detectors, for the first time, for in-beam gamma-ray spectroscopy at the RIBF. These initiatives not only provide fruitful scientific outcomes with the current RIBF, but also lay a foundation for in-beam reaction studies toward the upgraded RIBF, where the uranium beam intensity presently limited to 100 pnA will increase to 2,000 pnA.

In this talk, I will overview recent progresses and new scientific opportunities of in-beam reaction studies at the RIBF.