Dvorak J, Brüchle W, Chelnokov M, Dressler R, Düllmann CE, Eberhardt K, Gorshkov V, Jäger E, Krücken R, Kuznetsov A, Nagame Y, Nebel F, Novackova Z, Qin Z, Schädel M, Schausten B, Schimpf E, Semchenkov A, Thörle P, Türler A, Wegrzecki M, Wierczinski B, Yakushev A, Yeremin A. Doubly magic nucleus (108)(270)Hs162.
Phys Rev Lett 2006;
97:242501. [PMID:
17280272 DOI:
10.1103/physrevlett.97.242501]
[Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2006] [Revised: 08/09/2006] [Indexed: 05/13/2023]
Abstract
Theoretical calculations predict 270Hs (Z=108, N=162) to be a doubly magic deformed nucleus, decaying mainly by alpha-particle emission. In this work, based on a rapid chemical isolation of Hs isotopes produced in the 26Mg+248Cm reaction, we observed 15 genetically linked nuclear decay chains. Four chains were attributed to the new nuclide 270Hs, which decays by alpha-particle emission with Qalpha=9.02+/-0.03 MeV to 266Sg which undergoes spontaneous fission with a half-life of 444(-148)(+444) ms. A production cross section of about 3 pb was measured for 270Hs. Thus, 270Hs is the first nucleus for which experimental nuclear decay properties have become available for comparison with theoretical predictions of the N=162 shell stability.
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