The study of the neutron dripline has been of major interest for nuclear Physics during the last
decades. As the isotopes come closer to this limit of existence, new exotic phenomena arise (such as
halo nuclei) and the nuclear structure evolves dramatically with the appearance of new magic
numbers. The study of the neutron drip line was so far limited to very light nuclei (up to Beryllium)
but the advent of the RIKEN beams in early 2010 open the path for spectroscopy of heavier nuclei.
In this context the SAMURAI DayOne campaign, performed in 2012, has provided valuable data to
investigate the isotopes of Boron, Carbon, Nitrogen and Oxygen located before and after the
neutron dripline. In the present work, we present an invariant mass study of boron and carbon very
neutron rich isotopes using complementary neutron and proton knock-out probes. We will first
describe the experimental setup and introduce the analysis techniques. The results will be discussed
with comparison with theoretical expectations to propose interpretation. The talk will be concluded
by the prospects for new experiments and future developments.