Possible neutron and proton halo structure in the isobaric analog states of A=12 nuclei

摘要: The differential cross sections of the $^{11}\mathrm{B}(^{3}\mathrm{He},d)^{12}\mathrm{C}$ reaction leading to formation ${0}^{+}$ ground state and 15.11-MeV 1 ${}^{+}$, 16.57-MeV ${2}^{\ensuremath{-}}$, 17.23-MeV ${1}^{\ensuremath{-}}$ excited states $^{12}\mathrm{C}$ are measured at ${E}_{\text{lab}}=25$ MeV. analysis data is carried out within coupled-reaction-channels method for direct proton transfer bound unbound states. rms radii last in all studied determined. A comparison $^{12}\mathrm{B}, ^{12}\mathrm{C}$, $^{12}\mathrm{N}$ nuclei isobaric analog (IASs) with isospin $T=1$ determined by different methods allows us arrive a conclusion that these ${E}_{x}=2.62, 17.23,$ $1.80$ MeV, respectively, possess one-nucleon (neutron or proton) halo structure. enlarged large probability neutron be outside range interaction potential also found ${2}^{\ensuremath{-}}$ ${E}_{x}=1.67, 16.57,$ $1.19$ respectively. These IASs can regarded as candidates halo.