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

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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} ... continued below

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Dullmann, Ch.E.; Schadel, M.; Yakushev, A.; Turler, A.; Eberhardt, K.; Kratz, J.V. et al. December 22, 2009.

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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.

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  • Journal Name: Physical Reviewer Letters; Journal Volume: 114; Journal Issue: 25; Related Information: Journal Publication Date: 6/21/2010

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  • Report No.: LBNL-4043E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1000049
  • Archival Resource Key: ark:/67531/metadc837443

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  • December 22, 2009

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  • May 19, 2016, 3:16 p.m.

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  • June 15, 2016, 9:33 p.m.

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Dullmann, Ch.E.; Schadel, M.; Yakushev, A.; Turler, A.; Eberhardt, K.; Kratz, J.V. et al. Production and decay of element 114: high cross sections and the new nucleus 277Hs, article, December 22, 2009; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc837443/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.