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Journal Articles Physical Review C Year : 1993

Fission of heavy hypernuclei formed in antiproton annihilation

T.A. Armstrong
  • Function : Author
G. Ericsson
  • Function : Author
T. Johansson
  • Function : Author
T. Krogulski
  • Function : Author
R.A. Lewis
  • Function : Author
M. Maurel
  • Function : Author
E. Monnand
  • Function : Author
J. Mougey
  • Function : Author
J. Passaneau
  • Function : Author
P. Perrin
  • Function : Author
S.M. Polikanov
  • Function : Author
C. Ristori
  • Function : Author
G.A. Smith
  • Function : Author
G. Tibell
  • Function : Author

Abstract

Heavy hypernuclei are produced in the annihilation of antiprotons in 238 U . The delayed fission of heavy hypernuclei and hypernuclei of fission fragments are observed by using the recoil-distance method in combination with measurement of secondary electron multiplicity. The lifetime of hypernuclei in the region of uranium is found to be (1.25±0.15)× 10 − 10 sec. It is observed that Λ hyperons predominantly stick to the heavier fission fragments. The yield of hypernuclei is found to be (7.4±1.7)× 10 − 3 per stopped antiproton. No coincidences with K + were found. Statistical and systematic errors on the number of events expected do not rule out this possibility.

Dates and versions

in2p3-00014389 , version 1 (02-03-1999)

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T.A. Armstrong, J.P. Bocquet, G. Ericsson, T. Johansson, T. Krogulski, et al.. Fission of heavy hypernuclei formed in antiproton annihilation. Physical Review C, 1993, 47, pp.1957-1969. ⟨10.1103/PhysRevC.47.1957⟩. ⟨in2p3-00014389⟩
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