DREB2014 - Direct Reactions with Exotic Beams

The Modular Neutron Array (MoNA) in conjunction with the large-gap Sweeper magnet at the NSCL is an effective setup to explore neutron-unbound states. The recent addition of the Large-area multi-Institutional Scintillator Array (LISA) increased the efficiency and acceptance for the neutron detection. Neutron-unbound nuclei beyond the dripline as well as neutron unbound excited states of...

Unbound nuclei, at the border between bound nuclear systems and the continuum, offer a unique way to increase understanding of the nuclear interaction. Radioactive ion beams at high energies provide the possibility to create and study unbound nuclei using e.g. knock-out reactions. These reactions imply little interaction with the spectator part of the nucleus and are thus a versatile tool for...

Interpretation of the properties of unbound nuclei is one of the most important subjects in nuclear physics. In this paper we focus on 21C formed by the transfer reaction 20C(d,p)21C. In this reaction 21C (the n+20C system in fact) with various energy states, which can be the d3/2 resonance or nonresonant continuum states, are populated by the neutron transfer to 20C. We describe the...

Tetra-neutron systems in nuclei have attracted considerable attention since candidates of bound tetra-neutron system were reported[1]. While later theoretical paper using ab- initio calculations[2] suggest that bound tetra-neutron cannot exist, the possibility of the tetra-neutron system forming a resonance state is still an open and fascinating question. We performed missing-mass spectroscopy...