Discovery of Ca 60 and Implications for the Stability of Ca 70

O. B. Tarasov, D. S. Ahn, D. Bazin, N. Fukuda, A. Gade, M. Hausmann, N. Inabe, S. Ishikawa, N. Iwasa, K. Kawata, T. Komatsubara, T. Kubo, K. Kusaka, D. J. Morrissey, M. Ohtake, H. Otsu, M. Portillo, T. Sakakibara, H. Sakurai, H. SatoB. M. Sherrill, Y. Shimizu, A. Stolz, T. Sumikama, H. Suzuki, H. Takeda, M. Thoennessen, H. Ueno, Y. Yanagisawa, K. Yoshida

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60 Citations (Scopus)


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.

Original languageEnglish
Article number022501
JournalPhysical review letters
Issue number2
Publication statusPublished - 2018 Jul 11

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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