Total α-widths of neutron resonances of 147Sm and 149Sm

An investigation of the (n, α) reaction on ¹⁴⁷Sm and ¹⁴⁹Sm isotopes was performed in the energy range from 0 up to 400 eV and to 100 eV, respectively, using a multisectional proportional chamber. Values for the total α-widths or their upper limits were obtained for about 90 resonances. A comparison has been drawn between the obtained average α-widths and those predicted by optical and cluster models. In the case of ¹⁴⁹Sm, for resonances with spin 4^? the total α-width distribution was observed to be much narrower than expected from statistical theory. We failed to find a correlation between neutron and total α-widths.