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Phys. Rev. C 79, 037602 (2009) [4 pages]

Cross section limits for the 248Cm(25Mg,4n-5n)268,269Hs reactions

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J. Dvorak1,*, W. Brüchle2, Ch. E. Düllmann2, Z. Dvorakova1,†, K. Eberhardt3, R. Eichler4, E. Jäger2, Y. Nagame5, Z. Qin6, M. Schädel2, B. Schausten2, E. Schimpf2, R. Schuber1, A. Semchenkov1,2,‡, P. Thörle3, A. Türler1, M. Wegrzecki7, and A. Yakushev1
1Technische Universität München, D-85748 Garching, Germany
2GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
3Universität Mainz, D-55128 Mainz, Germany
4Paul Scherrer Institut, CH-5232 Villigen, Switzerland
5Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
6Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
7Institute of Electron Technology, PL-02-668 Warsaw, Poland

Received 3 December 2008; published 23 March 2009

We report on an attempt to produce and detect 268Hs and 269Hs in the nuclear fusion reaction 25Mg+248Cm using the gas phase chemistry apparatus COMPACT. No decay chains attributable to the decay of hassium isotopes were observed during the course of this experiment. From the nonobservation of 269Hs we derive a cross section limit of 0.4 pb (63% confidence limit) for the reaction 248Cm(25Mg,4n)269Hs at a center-of-target beam energy of 140 MeV. The evaluated cross section limit for the 248Cm(25Mg,5n)268Hs reaction depends on the assumed half-life of unknown 268Hs. Current systematics of the half-lives for even-even Hs isotopes suggests a value of 0.5 s, resulting in a cross section limit of 1.3 pb.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.79.037602
DOI:
10.1103/PhysRevC.79.037602
PACS:
27.90.+b, 21.10.Tg, 23.60.+e, 25.70.Gh

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

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

‡Present address: Fysisk institutt, 0316 Oslo, Norway.

 
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