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Fission of heavy hypernuclei formed in antiproton annihilation

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.
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Contributor : Sylvie Flores <>
Submitted on : Tuesday, March 2, 1999 - 10:19:13 AM
Last modification on : Tuesday, January 26, 2021 - 2:40:09 PM

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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, American Physical Society, 1993, 47, pp.1957-1969. ⟨10.1103/PhysRevC.47.1957⟩. ⟨in2p3-00014389⟩

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