Abstract
An emulsion-counter hybrid experiment (KEK E176) was carried out to search for double strangeness systems such as double-Λ hypernuclei and H-dibaryons. More than 10% of Ξ- hyperons produced in the (K-, K+) reaction were brought to rest in the nuclear emulsion. We have obtained 98 candidate events of nuclear capture at rest of Ξ- hyperons which are described in this report. Among those, four events were identified as sequential weak decay of double-Λ hypernuclei. The binding energies of Ξ--(12C, 14N and 16O) states have been estimated for two events which emit twin single-Λ hypernuclei back to back from the capture point. The Σ- p decay vertex of an H-dibaryon was searched for near the capture point and no evidence was observed. Upper limits for the branching ratio of H emission are 5-10% for a lifetime less than 0.1 ns at the 90% confidence level. The trapping probabilities of single and double strangeness to a nuclear fragment following Ξ- capture at rest have been studied.
Original language | English |
---|---|
Pages (from-to) | 191-232 |
Number of pages | 42 |
Journal | Nuclear Physics A |
Volume | 828 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - 2009 Sep 15 |
Externally published | Yes |
Keywords
- C
- Hybrid emulsion experiment
- N
- Nuclear reactions
- O(Ξ, X)
- binding energies
- deduced
- double-Λ and twin-Λ hypernuclei production
- measured
- particle tracks following hypernucleus production
- subsequent decay
- Ξ capture at rest
ASJC Scopus subject areas
- Nuclear and High Energy Physics