Production and Decay of Element 114: High Cross Sections and the New Nucleus (277)Hs

Ch. E. Duellmann*, M. Schaedel, A. Yakushev, A. Tuerler, K. Eberhardt, J. V. Kratz, D. Ackermann, L. -L. Andersson, M. Block, W. Bruechle, J. Dvorak, H. G. Essel, P. A. Ellison, J. Even, J. M. Gates, A. Gorshkov, R. Graeger, K. E. Gregorich, W. Hartmann, R. -D. HerzbergF. P. Hessberger, D. Hild, A. Huebner, E. Jaeger, J. Khuyagbaatar, B. Kindler, J. Krier, N. Kurz, S. Lahiri, D. Liebe, B. Lommel, M. Maiti, H. Nitsche, J. P. Omtvedt, E. Parr, D. Rudolph, J. Runke, B. Schausten, E. Schimpf, A. Semchenkov, J. Steiner, P. Thoerle-Pospiech, J. Uusitalo, M. Wegrzecki, N. Wiehl

*Corresponding author voor dit werk

Onderzoeksoutput: ArticleAcademicpeer review

231 Citaten (Scopus)

Samenvatting

The fusion-evaporation reaction Pu-244(Ca-48, 3-4n)(288,289)114 was studied at the new gas-filled recoil separator TASCA. Thirteen correlated decay chains were observed and assigned to the production and decay of (288, 289)114. At a compound nucleus excitation energy of E* = 39.8-43.9 MeV, the 4n evaporation channel cross section was 9.8(-3.1)(+3.9) pb. At E* = 36.1-39.5 MeV, that of the 3n evaporation channel was 8.0-(+7.4)(4.5) pb. In one of the 3n evaporation channel decay chains, a previously unobserved alpha branch in (281)Ds was observed ( probability to be of random origin from background: 0.1%). This alpha decay populated the new nucleus (277)Hs, which decayed by spontaneous fission after a lifetime of 4.5 ms.

Originele taal-2English
Artikelnummer252701
Aantal pagina's5
TijdschriftPhysical Review Letters
Volume104
Nummer van het tijdschrift25
DOI's
StatusPublished - 21-jun.-2010
Extern gepubliceerdJa

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