New superheavy element isotopes: Pu242(Ca48,5n)128514

P. A. Ellison, K. E. Gregorich, J. S. Berryman, D. L. Bleuel, R. M. Clark, I. Dragojević, J. Dvorak, P. Fallon, C. Fineman-Sotomayor, J. M. Gates, O. R. Gothe, I. Y. Lee, W. D. Loveland, J. P. McLaughlin, S. Paschalis, M. Petri, J. Qian, L. Stavsetra, M. Wiedeking, H. Nitsche

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The new, neutron-deficient, superheavy element isotope 128514 was produced in Ca48 irradiations of Pu242 targets at a center-of-target beam energy of 256 MeV (E*=50MeV). The α decay of 128514 was followed by the sequential α decay of four daughter nuclides, Cn281, Ds277, Hs273, and Sg269. Rf265 was observed to decay by spontaneous fission. The measured α-decay Q values were compared with those from a macroscopic-microscopic nuclear mass model to give insight into superheavy element shell effects. The Pu242(Ca48,5n)128514 cross section was 0.6-0.5+0.9pb.

Original languageEnglish
Article number182701
JournalPhysical Review Letters
Issue number18
Publication statusPublished - 26 Oct 2010

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