Abstract
Production and decay of the isotopes of Hs were studied in the 226Ra+48Ca reaction at beam energies Elab=229, 234, and 241 MeV. At the Elab=234 MeV energy, the maximum of the 4n-evaporation channel of the reaction, six identical α-SF decay chains of the nucleus 270Hs were detected corresponding to a cross section of σ4n=16−7+13 pb. At the other 48Ca energies, no Hs isotopes were observed. Nuclei of 270Hs undergo α decay with a Qα=9.15±0.08 MeV and the half-life of the daughter spontaneous fission (SF) isotope 266Sg is 0.28−0.08+0.19 s, in good agreement with the data previously observed in the 248Cm(26Mg,4n)270Hs reaction. The partial α-decay half-life of 270Hs was measured for the first time: Tα=7.6−2.2+4.9 s. For the spontaneous fission, we determined a lower limit TSF⩾10 s. Decay properties of 270Hs corroborate theoretical predictions of its relatively high stability caused by the effect of the deformed shells at Z=108 and N=162.Received 28 September 2012DOI:https://doi.org/10.1103/PhysRevC.87.034605©2013 American Physical Society
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