A Λnn three-body resonance

¹ Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Fukuoka, Japan
² Faculty of Applied Physics, Okayama University of Science, 1-1 Ridaicho, Okayama 700-0005, Japan
³ Research Center for Nuclear Physics, Osaka University, Ibaraki 567-0047, Osaka Japan

^a e-mail: kamada@mns.kyutech.ac.jp
^b e-mail: miyagawa@dap.ous.ac.jp
^c e-mail: yamagu@rcnp.osaka-u.ac.jp

Published online: 25 March 2016

Abstract

We solved the Faddeev equations in the Λnn system J^π = ½⁺, T = 1). There is no bound state but found a resonance state. Complex Energy Method helps to find the location of the resonance energy in the complex Riemann sheet. We obtained a resonance energy E = 0.25 − 0.40i MeV using the realistic NN and YN Nijmegen potential. As a preliminary result the recent Nijmegen YN potential (NSC97f) gives 0.60± 0.05 - (0.25 ± 0.05)i MeV. We discuss importance of an irreducible three-body force to make it bound.