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Discovery of Ca60 and Implications For the Stability of Ca70

O. B. Tarasov et al.
Phys. Rev. Lett. 121, 022501 – Published 11 July 2018

Abstract

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 345MeV/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.

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  • Received 7 May 2018
  • Revised 11 June 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.022501

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 121, Iss. 2 — 13 July 2018

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