The discovery of the important neutron-rich nucleus Ca402060 and seven others near the limits of nuclear stability is reported from the fragmentation of a 345 MeV/u Zn70 projectile beam on Be9 targets at the radioactive ion-beam factory of the RIKEN Nishina Center. The produced fragments were analyzed and unambiguously identified using the BigRIPS two-stage in-flight separator. The eight new neutron-rich nuclei discovered, P47, S49, Cl52, Ar54, K57, Ca59,60, and Sc62, are the most neutron-rich isotopes of the respective elements. In addition, one event consistent with K59 was registered. The results are compared with the drip lines predicted by a variety of mass models and it is found that the models in best agreement with the observed limits of existence in the explored region tend to predict the even-mass Ca isotopes to be bound out to at least Ca70.
ASJC Scopus subject areas
- Physics and Astronomy(all)