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

Düllmann, Ch. E.; Schädel, M.; Yakushev, A.; Türler, A.; Eberhardt, K.; Kratz, J. V.; Ackermann, D.; Andersson, L. -L.; Block, M. and Brüchle, W., et al. (2010) In Physical Review Letters 104(25).
Abstract
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.
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Physical Review Letters
volume
104
issue
25
publisher
American Physical Society
external identifiers
  • wos:000279037400001
  • scopus:77953775504
ISSN
1079-7114
DOI
10.1103/PhysRevLett.104.252701
language
English
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yes
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f65c219f-f4c8-46cf-81d8-4c7411d6f85d (old id 1629889)
date added to LUP
2010-07-22 09:12:43
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@article{f65c219f-f4c8-46cf-81d8-4c7411d6f85d,
  abstract     = {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.},
  articleno    = {252701},
  author       = {Düllmann, Ch. E. and Schädel, M. and Yakushev, A. and Türler, A. and Eberhardt, K. and Kratz, J. V. and Ackermann, D. and Andersson, L. -L. and Block, M. and Brüchle, W. and Dvorak, J. and Essel, H. G. and Ellison, P. A. and Even, J. and Gates, J. M. and Gorshkov, A. and Graeger, R. and Gregorich, K. E. and Hartmann, W. and Herzberg, R. -D. and Heßberger, F. P. and Hild, D. and Huebner, A. and Jäger, E. and Khuyagbaatar, J. and Kindler, B. and Krier, J. and Kurz, N. and Lahiri, S. and Liebe, D. and Lommel, B. and Maiti, M. and Nitsche, H. and Omtvedt, J. P. and Parr, E. and Rudolph, Dirk and Runke, J. and Schausten, B. and Schimpf, E. and Semchenkov, A. and Steiner, J. and Thörle-Pospiech, P. and Uusitalo, J. and Wegrzecki, M. and Wiehl, N.},
  issn         = {1079-7114},
  language     = {eng},
  number       = {25},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Production and Decay of Element 114: High Cross Sections and the New Nucleus 277Hs},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.104.252701},
  volume       = {104},
  year         = {2010},
}