Relativistic hypernuclei: old problems and new prospects

0110226 - UJF-V 20043294 RIV CZ eng J - Journal Article
Majling, Lubomír - Lukstins, J. - Parfenov, AN. - Chren, D. - Solar, M. - Sopko, B.
Relativistic hypernuclei: old problems and new prospects.
[Relativistická hyperjádra: staré problémy a nové perspektivy.]
Czechoslovak Journal of Physics. Roč. 53, č. 8 (2003), s. 667-677. ISSN 0011-4626
R&D Projects: GA ČR GA202/02/0930; GA AV ČR KSK1048102
Keywords : quantum wave -guides * Schrödinger-operators * Dirichlet
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 0.263, year: 2003

The first experiments with relativistic hypernuclei (Bowen; Khorozov and Lukstins) were done many years ago. They demonstrated not only that such extremely difficult experiments are manageable but also their great advantage, a possibility of observing and studying independently the production and weak decay of hypernuclei: the points of the production and decay of relativistic hypernuclei are separated by tens of centimeters instead of some microns in classical experiments. At the same time these first experiments revealed a huge problem with selection of the proper trigger. Recently we proposed to explore a unique feature of the Be-9 nucleus: after removing a neutron from its ground state several groups of alpha-particles appear from different excited states of a residual nucleus Be-8. Detection of the correlated pair of alpha-particles produced in a vacuum volume at a distance of some 40 cm from target is an unambiguous signal of nonmesonic decay of hypernucleus Be-10(Lambda) (-->alpha+alpha+n+n) or B-10(Lambda) (-->alpha+alpha+n+p). In this particular case it is possible to take exclusive decay rates (on different excited states of Be-8*). This open a way for a phenomenological analysis of matrix elements of the four-baryon weak interaction.

První experimenty s produkcí relativistických hyperjader byly provedeny před mnoha lety. Dokázaly, že takové velice náročné experimenty jsou realizovatelné a, pokud se vybere vhodný trigger, mohou poskytnout velice zajímavé informace. Nedávno jsme navrhli využít jedinečné vlastnosti jádra 9Be: při oddělení neutronu vzniká několik stavů jádra , které se okamžitě rozpadají na dvě částice alfa. Naskýtá se výjimečná příležitost určit všechny potřebné maticové elementy čtyř baryonové slabé interakce (LN ® NN). Experiment byl zařazen do programu pro nový urychlovač Nuklotron v SÚJV Dubna.
Permanent Link: http://hdl.handle.net/11104/0000283