Spin-isospin excitations in 13N have been studied by means of the (3He,t) and (3He,tp) reactions at a bombarding energy of E(3He)=450 MeV. The zero-degree (3He,t) spectrum is found to be similar to those from the (p,n) reactions at intermediate energies, suggesting a simple direct reaction mechanism at E(3He) =450 MeV. The Gamow-Teller (GT) states with Jπ=1/2- and 3/2 - have been strongly excited at θlab=0°. The angular distribution of cross sections for the 13C( 3He,t)13N reaction and the elastic 3He scattering off 13C were obtained at θlab=0° - 17° and at θlab=2° - 22°, respectively. The obtained experimental results were compared with calculations performed in distorted-wave Born approximation. Microscopic structures of the states in 13N have further been studied by observing decay protons in coincidence with high-energy tritons measured at θlab=0°. The branching ratios for proton decay from the GT states in 13N to the final low-lying T=0 states in 12C were obtained. The wave functions of the excited states in 13N are discussed on the basis of obtained experimental data and relevant theoretical calculations.
|Journal||Physical Review C - Nuclear Physics|
|Publication status||Published - 2004 Jun|
ASJC Scopus subject areas
- Nuclear and High Energy Physics