Population of 0+ excited states in reactions with transmission of two nucleons

Properties of 0+ excited states, generated by the pair and quadrupole-quadrupole interactions in some isotopes of the rare-earth region, are studied. The excitation energies for 0+ states, E (0)- and E (2)-transitions, Rasmussen parameter X and cross sections for two nucleon transfer reactions are calculeted taking into account the mixing of excited states with different values. The contribution of mixing excited states underestimates the values of the calculated physical quantities.

Multi-nucleon transfer reactions at ion catcher facilities - a new way to produce and study heavy neutron-rich nuclei

The production of very neutron-rich nuclides heavier than fission fragments is an ongoing experimental challenge. Multi-nucleon transfer reactions (MNT) have been suggested as a method to produce these nuclides. By thermalizing the reaction products in gas-filled stopping cells, we can deliver them as cooled high-quality beams to decay, laser and mass spectrometry experiments. High precision mass spectrometry will allow for the first time to universally and unambiguously identify the atomic and proton numbers of the ions produced in MNT reactions. In this way their ground and isomeric state properties can be studied in high-precision measurements. In experiments at IGISOL, Finland and at FRS Ion Catcher, Germany, we have done and will perform broadband measurements of the reaction products, with the aim to improve the understanding of the reaction mechanism and to determine the properties of the ground and isomeric states of the produced nuclides. First results and preparations for upcoming experiments are presented.