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The onset of Lambda Lambda hypernuclear binding
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SYSNO ASEP 0509906 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The onset of Lambda Lambda hypernuclear binding Author(s) Contessi, L. (IL)
Schäfer, Martin (UJF-V) ORCID, RID
Barnea, N. (IL)
Gal, A. (IL)
Mareš, Jiří (UJF-V) RID, ORCIDNumber of authors 5 Article number 134893 Source Title Physics Letters. B. - : Elsevier - ISSN 0370-2693
Roč. 797, č. 10 (2019)Number of pages 5 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords Light Lambda Lambda hypernuclei ; LO (sic) pEFT ; SVM calculations Subject RIV BE - Theoretical Physics OECD category Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect) R&D Projects GA19-19640S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UJF-V - RVO:61389005 UT WOS 000488071200061 EID SCOPUS 85071555018 DOI 10.1016/j.physletb.2019.134893 Annotation Binding energies of light, A <= 6, Lambda Lambda hypernuclei are calculated using the stochastic variational method in a pionless effective field theory ((sic)pEFT) approach at leading order with the purpose of assessing critically the onset of binding in the strangeness S = -2 hadronic sector. The (sic)EFT input in this sector consists of (i) a Lambda Lambda contact term constrained by the Lambda Lambda scattering length a(Lambda Lambda), using a range of values compatible with Lambda Lambda correlations observed in relativistic heavy ion collisions, and (ii) a Lambda Lambda N contact term constrained by the only available A <= 6 Lambda Lambda hypernucler binding energy datum of He-6(Lambda Lambda). The recently debated neutral three-body and four-body systems (3)(Lambda Lambda)n and (4)(Lambda Lambda)n are found unbound by a wide margin. A relatively large value of vertical bar a(Lambda Lambda)vertical bar greater than or similar to 1.5 fm is needed to bind H-4(Lambda Lambda), thereby questioning its particle stability. In contrast, the particle stability of the A = 5 Lambda Lambda hypernuclear isodoublet H-5(Lambda Lambda)-He-5(Lambda Lambda) is robust, with Lambda separation energy of order 1 MeV. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2020 Electronic address https://doi.org/10.1016/j.physletb.2019.134893
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