Production and Decay of Element 114: High Cross Sections and the New Nucleus Hs277

Ch. E. Düllmann et al.
Phys. Rev. Lett. 104, 252701 – Published 21 June 2010

Abstract

The fusion-evaporation reaction Pu244(Ca48,34n)114288,289 was studied at the new gas-filled recoil separator TASCA. Thirteen correlated decay chains were observed and assigned to the production and decay of 114288,289. At a compound nucleus excitation energy of E*=39.843.9MeV, the 4n evaporation channel cross section was 9.83.1+3.9pb. At E*=36.139.5MeV, that of the 3n evaporation channel was 8.04.5+7.4pb. In one of the 3n evaporation channel decay chains, a previously unobserved α branch in Ds281 was observed (probability to be of random origin from background: 0.1%). This α decay populated the new nucleus Hs277, which decayed by spontaneous fission after a lifetime of 4.5 ms.

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  • Received 22 December 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.252701

©2010 American Physical Society

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Vol. 104, Iss. 25 — 25 June 2010

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