FISSION OF HEAVY HYPERNUCLEI FORMED IN ANTIPROTON ANNIHILATION

Authors
ARMSTRONG TA BOCQUET JP ERICSSON G JOHANSSON T KROGULSKI T LEWIS RA MALEK F MAUREL M MONNAND E MOUGEY J NIFENECKER H PASSANEAU J PERRIN P POLIKANOV SM REYCAMPAGNOLLE M RISTORI C SMITH GA TIBELL G
Citation
Ta. Armstrong et al., FISSION OF HEAVY HYPERNUCLEI FORMED IN ANTIPROTON ANNIHILATION, Physical review. C. Nuclear physics, 47(5), 1993, pp. 1957-1969
Citations number
19
Categorie Soggetti
Physics, Nuclear
Journal title
Physical review. C. Nuclear physics → ACNP
ISSN journal
05562813
Volume
47
Issue
5
Year of publication
1993
Pages
1957 - 1969
Database
ISI
SICI code
0556-2813(1993)47:5<1957:FOHHFI>2.0.ZU;2-V
Abstract
Heavy hypernuclei are produced in the annihilation of antiprotons in U -238. The delayed fission of heavy hypernuclei and hypernuclei of fiss ion fragments are observed by using the recoil-distance method in comb ination with measurement of secondary electron multiplicity. The lifet ime of hypernuclei in the region of uranium is found to be (1.25 +/- 0 .15) x 10(-10) sec. It is observed that A hyperons predominantly stick to the heavier fission fragments. The yield of hypernuclei is found t o be (7.4 +/- 1.7) X 10(-3) per stopped antiproton. No coincidences wi th K+ were found. Statistical and systematic errors on the number of e vents expected do not rule out this possibility.