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Phys. Rev. Lett. 100, 132503 (2008) [4 pages]

Observation of the 3n Evaporation Channel in the Complete Hot-Fusion Reaction 26Mg+248Cm Leading to the New Superheavy Nuclide 271Hs

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J. Dvorak1,*, W. Brüchle2, M. Chelnokov3, Ch. E. Düllmann2,4,5, Z. Dvorakova1,†, K. Eberhardt6, E. Jäger2, R. Krücken1, A. Kuznetsov3, Y. Nagame7, F. Nebel1, K. Nishio7, R. Perego1, Z. Qin2,8, M. Schädel2, B. Schausten2, E. Schimpf2, R. Schuber1, A. Semchenkov1,2, P. Thörle9, 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
4Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
5University of California, Berkeley, California 94720-1460, USA
6Universität Mainz, D-55128 Mainz, Germany
7Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
8Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China
9Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany
10Institute of Electron Technology, 02-668 Warsaw, Poland

Received 31 October 2007; published 3 April 2008

The analysis of a large body of heavy ion fusion reaction data with medium-heavy projectiles (6≤Z≤18) and actinide targets suggests a disappearance of the 3n exit channel with increasing atomic number of the projectile. Here, we report a measurement of the excitation function of the reaction 248Cm(26Mg,xn)274-xHs and the observation of the new nuclide 271Hs produced in the 3n evaporation channel at a beam energy well below the Bass fusion barrier with a cross section comparable to the maxima of the 4n and 5n channels. This indicates the possible discovery of new neutron-rich transactinide nuclei using relatively light heavy ion beams of the most neutron-rich stable isotopes and actinide targets.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.132503
DOI:
10.1103/PhysRevLett.100.132503
PACS:
27.90.+b, 21.10.Tg, 23.60.+e, 25.70.Gh

*Present address: Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

†Present address: University of California, Berkeley, CA 94720-1460, USA.

 
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