Production and decay of element 114: high cross sections and the new nucleus 277Hs

The fusion-evaporation reaction {sup 244}Pu({sup 48}Ca,3-4n){sup 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 {sup 288,289}114. At a compound nucleus excitation energy of E* = 39.8-43....

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Published in:Physical review letters 2009-12, Vol.114 (25)
Main Authors: Dullmann, Ch.E., Schadel, M., Yakushev, A., Turler, A., Eberhardt, K., Kratz, J.V., Ackermann, D., Andersson, L.-L., Block, M., Bruchle, W., Dvorak, J., Essel, H.G., Ellison, P.A., Even, J., Gates, J.M., Gorshkov, A., Graeger, R., Gregorich, K.E., Hartmann, W., Herzberg, R.-D., Hessberger, F.P., Hild, D., Hubner, A., Jager, E., Khuyagbaatar, J., Kindler, B., Krier, J., Kurz, N., Lahiri, S., Liebe, D., Lommel, B., Maiti, M., Nitsche, H., Omtvedt, J.P., Parr, E., Rudolph, D., Runke, J., Schausten, B., Schimpf, E., Semchenkov, A., Steiner, J., Thorle-Pospiech, P., Uusitalo, J., Wegrzecki, M., Wiehl, N.
Format: Article
Language:English
Subjects:
73
CHAINS
CROSS SECTIONS
DECAY
ELEMENT 114
EVAPORATION
EXCITATION
LIFETIME
ORIGIN
PROBABILITY
PRODUCTION
SPONTANEOUS FISSION
Superheavy Elements Transactinides Element 114 Fusion Reaction Recoil Separator
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Summary:The fusion-evaporation reaction {sup 244}Pu({sup 48}Ca,3-4n){sup 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 {sup 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{sub -3.1}{sup +3.9} pb. At E* = 36.1-39.5 MeV, that of the 3n evaporation channel was 8.0{sub -4.5}{sup +7.4} pb. In one of the 3n evaporation channel decay chains, a previously unobserved {alpha} branch in {sup 281}Ds was observed (probability to be of random origin from background: 0.1%). This {alpha} decay populated the new nucleus {sup 277}Hs, which decayed by spontaneous fission after a lifetime of 4.5 ms.
ISSN:0031-9007
1079-7114