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Phys. Rev. Lett. 97, 242501 (2006) [4 pages]

Doubly Magic Nucleus 108270Hs162

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J. Dvorak1, W. Brüchle2, M. Chelnokov3, R. Dressler4, Ch. E. Düllmann5,6,*, K. Eberhardt7, V. Gorshkov3, E. Jäger2, R. Krücken1, A. Kuznetsov3, Y. Nagame8, F. Nebel1, Z. Novackova1, Z. Qin2,9, M. Schädel2, B. Schausten2, E. Schimpf2, A. Semchenkov1,2, P. Thörle7, A. Türler1, M. Wegrzecki10, B. Wierczinski1, A. Yakushev1, and A. Yeremin3
1Technische Universität München, D-85748 Garching, Germany
2Gesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, Germany
3Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation
4Paul Scherrer Institut, CH-5232 Villigen, Switzerland
5Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
6University of California, Berkeley, California 94720-1460, USA
7Universität Mainz, D-55128 Mainz, Germany
8Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1195, Japan
9Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China
10Institute of Electron Technology, PL-02-668 Warsaw, Poland

Received 19 April 2006; revised 9 August 2006; published 14 December 2006

See accompanying Physics Focus

Theoretical calculations predict 270Hs (Z=108, N=162) to be a doubly magic deformed nucleus, decaying mainly by α-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 α-particle emission with Qα=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.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.242501
DOI:
10.1103/PhysRevLett.97.242501
PACS:
27.90.+b, 21.10.Tg, 23.60.+e, 25.70.Gh

*Present address: Gesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, Germany.

 
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