抄録
The (p, n) reaction on 55Mn was studied with the emphasis upon the investigation of the low-lying states of 55Fe. The angular distributions of each neutron groups corresponding to energy states of 55Fe lower than 0.93 MeV were measured at ten different proton energies in the energy range from 2.3 MeV to 2.8 MeV. New levels of 55Fe at 0.51 and 0.68 MeV reported by Kim at ORNL were not observed at least with so much intensities as he claimed. The Integrated cross section of each group corresponding to the low-lying states of 55Fe was analyzed by means of the statistical theory due to Hauser and Feshbach. As a Consequence, the spin and parity of 0.41 MeV level were assigned as 1⁄2−; 3⁄2− was excluded. This assignment is consistent with that suggested by Schiffer et al.. The measurement of The life of the first excited state at 041 MeV was tried as a testing of core-excitation model.
