Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1838246 | Nuclear Physics A | 2009 | 42 Pages |
Abstract
An emulsion-counter hybrid experiment (KEK E176) was carried out to search for double strangeness systems such as double-Î hypernuclei and H-dibaryons. More than 10% of Îâ hyperons produced in the (Kâ, K+) reaction were brought to rest in the nuclear emulsion. We have obtained 98 candidate events of nuclear capture at rest of Îâ hyperons which are described in this report. Among those, four events were identified as sequential weak decay of double-Î hypernuclei. The binding energies of Îâ-(12C, 14N and 16O) states have been estimated for two events which emit twin single-Î hypernuclei back to back from the capture point. The Σâp 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 Îâ capture at rest have been studied.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
KEK E176 Collaboration KEK E176 Collaboration, S. Aoki, S.Y. Bahk, S.H. Chung, H. Funahashi, C.H. Hahn, M. Hanabata, T. Hara, S. Hirata, K. Hoshino, M. Ieiri, T. Iijima, K. Imai, Y. Itow, T. Jin-ya, M. Kazuno, C.O. Kim, J.Y. Kim, C.S. Yoon,