The continuum spectrum of hypernuclear trios

Physics Letters B

B. Bazak¹  M. Schäfer²  N. Barnea³  J. Mareš³ 

[1] Nuclear Physics Institute of the Czech Academy of Sciences, 25069 Řež, Czech Republic;Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Břehová 7, 11519 Prague 1, Czech Republic;The Racah Institute of Physics, The Hebrew University, Jerusalem 9190401, Israel;

关键词: Hypernuclei;    Effective field theory;    Hypertriton;    Λnn;    Resonance;   

DOI  :  

来源: DOAJ

【 摘 要 】

The spectrum of hypernuclear trios composed of a Λ baryon and two nucleons is the subject of an ongoing experimental campaign, aiming to study the interaction of the Λ particle with a neutron, and the 3-body Λ-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 Λnp Jπ=3/2+ channel, leading to cross-section enhancement near threshold. For the Λnn Jπ=1/2+ channel we predict a resonance state. Depending, however, on the value of the ΛN scattering length, the resonance pole moves from the physical to the unphysical complex energy sheet within the experimental bounds.

【 授权许可】

Unknown