GALS – setup for production and study of heavy neutron rich nuclei

Abstract

Abstract. The present limits of the upper part of the nuclear map are very close to stability while the unexplored area of heavy neutron-rich nuclides along the neutron closed shell N = 126 below 208 Pb is extremely important for nuclear astrophysics investigations and, in particular, for the understanding of the r-process of astrophysical nucleosynthesis. This area of the nuclear map can be reached neither in fusion-fission reactions nor in fragmentation processes widely used nowadays for the production of exotic nuclei. A new way was recently proposed for the production of these nuclei via low-energy multi-nucleon transfer reactions. The estimated yields of neutron-rich nuclei are found to be significantly high in such reactions and several tens of new nuclides can be produced, for example, in the near-barrier collision of 136 Xe with 208 Pb. A new setup is proposed to produce and study heavy neutron-rich nuclei located along the neutron closed shell N=126.

Study of the population of neutron-rich heavy nuclei in the A~200 mass region via multinucleon transfer reactions

“…The large acceptance of these spectrometers and the high resolving power of their detection systems gave a boost to this kind of studies. Different groups have recently started with or proposed measurements, focused on the determination of the heavy partner yield, in connection with the preparatory phases of facilities, such as KISS (KEK Iso-EPJ Web of Conferences 163, 00017 (2017) DOI: 10.1051/epjconf/201716300017 FUSION17 tope Separator System) [6] at the Radiactive Isotope Beam Factory (RIBF) in RIKEN and GALS (Gas cell and Laser ion Separation) at the Joint Institute for Nuclear Research in Dubna [7], aiming to the study of β-decay spectroscopy of neutron-rich heavy nuclei in the A∼200 and N∼126 region populated via MNT. This information can be obtained either through γ-particle coincidence experiments [8], gating the light partner identified with high-resolution tracking spectrometers and measuring the yields of heavy partners via the associated γ-rays spectra Doppler corrected for the heavy partner, or via integral measurements of delayed β-γ coincidences [9].…”