Study of multi-nucleon transfer reactions at the JAEA tandem accelerator facility

Katsuhisa Nishio (Japan Atomic Energy Agency)

Multi-nucleon transfer (MNT) reaction attracts interest in nuclear physics community as it can produce neutron-rich heavy and superheavy nuclei. On the other hand, the reaction process is not well understood, making it difficult to find the optimal target-projectile combination and reaction energy. In order to create a reliable theoretical model, it is important to obtain experimental data in detail. We have started to measure cross sections of evaporation residues (ERs) produced in MNT reactions using the recoil mass separator, JAEA-RMS. Taking advantage of a feature that JAEA-RMS can easily rotate around the target chamber, we can separate ERs at finite recoil angles. We established the on-line alpha-decay measurement at the focal plane detector to identify produced nuclides, and their cross sections were measured as a function of recoil angle. In the studied reaction 30Si+209Bi, it is found that isomeric state with higher spins is produced with larger cross sections than low-spin ground state.