Abstract
The role of 2p-shell admixture in the ground-state wave function of 13C is studied in the case of reactions such as 13C(e,e) 13C, 13 C(π +, π 0) 13 N g.s. , and 13C(p,n) 13N g.s.. A comparison is made between microscopic ground-state wave functions elaborated in the (0+2) h ̷ ω basis and the phenomenological 1p-shell model. The best agreement with the data for electromagnetic form factors, cross sections, and asymmetries is achieved using a combination of the microscopic and the phenomenological description. At low pion energies a large suppression of differential cross section is observed for the 13 C(π +, π 0) 13 N g.s. reaction when 2ħω configurations are taken into account.
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