Isospin triplet A=14: search for states with enhanced radii

This is the authors' abstract. We don't add key points for this paper.

This article is devoted to study of isobar-analogue states 1 − in triplet A=14: 14 C- 14 N- 14 O. Previously signs of neutron halo in the 1 − , 6.09 MeV state of 14 C were obtained by two independent groups. In this article we propose to study neighbouring nuclei 14 N and 14 O using the Modified diffraction model (MDM) method and the method of Asymptotic normalization coefficients (ANC). Methods were applied to experimental differential cross sections of 14 C(α,α) 14 C scattering and reactions 13 C( 3 He,d) 14 N and 14 N( 3 He,t) 14 O. MDM and ANC gave practically similar within errors radii for the studied 1 − states: the 6.09 MeV state in 14 C – 2.7±0.1 fm, the 8.06 MeV state in 14 N – 2.7 ± 0.1 fm, the 5.17 MeV state in 14 O – 2.6 ± 0.2 fm. Moreover, the signs of proton halo in the 1 − state of 14 N were obtained for the first time.