TY - JOUR
T1 - Discovery of Ca 60 and Implications for the Stability of Ca 70
AU - Tarasov, O. B.
AU - Ahn, D. S.
AU - Bazin, D.
AU - Fukuda, N.
AU - Gade, A.
AU - Hausmann, M.
AU - Inabe, N.
AU - Ishikawa, S.
AU - Iwasa, N.
AU - Kawata, K.
AU - Komatsubara, T.
AU - Kubo, T.
AU - Kusaka, K.
AU - Morrissey, D. J.
AU - Ohtake, M.
AU - Otsu, H.
AU - Portillo, M.
AU - Sakakibara, T.
AU - Sakurai, H.
AU - Sato, H.
AU - Sherrill, B. M.
AU - Shimizu, Y.
AU - Stolz, A.
AU - Sumikama, T.
AU - Suzuki, H.
AU - Takeda, H.
AU - Thoennessen, M.
AU - Ueno, H.
AU - Yanagisawa, Y.
AU - Yoshida, K.
N1 - Funding Information:
The authors would like to acknowledge the operations staff of the RIBF for developing the intense beam necessary for this study. This work was supported by the U.S. National Science Foundation under Grant No. PHY-1565546. Discussions with Professors A. V. Afanasjev, B. A. Brown, E. V. Litvinova, W. Nazarewicz, and Dr. E. Olsen are very much appreciated.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/7/11
Y1 - 2018/7/11
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.121.022501
DO - 10.1103/PhysRevLett.121.022501
M3 - Article
C2 - 30085743
AN - SCOPUS:85049965141
VL - 121
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 2
M1 - 022501
ER -