The continuum spectrum of hypernuclear trios

0533998 - ÚJF 2021 RIV NL eng J - Journal Article
Schäfer, Martin - Bazak, B. - Barnea, N. - Mareš, Jiří
The continuum spectrum of hypernuclear trios.
Physics Letters. B. Roč. 808, SEP (2020), č. článku 135614. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA ČR GA19-19640S
Institutional support: RVO:61389005
Keywords : hypernuclei * effective field theory * hypertriton
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impact factor: 4.771, year: 2020
Method of publishing: Open access
https://doi.org/10.1016/j.physletb.2020.135614

The spectrum of hypernuclear trios composed of a Lambda baryon and two nucleons is the subject of an ongoing experimental campaign, aiming to study the interaction of the Lambda particle with a neutron, and the 3-body Lambda-nucleon-nucleon force. In this manuscript we utilize baryonic effective field theory at leading order, constrained to reproduce the available low energy light hypernuclear data, to study the continuum spectrum of such hypernuclear trios. Using the complex scaling method and the inverse analytic continuation in the coupling constant method we find the existence of a virtual state in the Lambda np J(pi) = 3/2(+) channel, leading to cross-section enhancement near threshold. For the Lambda nn J(pi) = 1/2(+) channel we predict a resonance state. Depending, however, on the value of the Lambda N scattering length, the resonance pole moves from the physical to the unphysical complex energy sheet within the experimental bounds.
Permanent Link: http://hdl.handle.net/11104/0312220