Detection and study on the 187Os(n,α)184W reaction on the resonance neutrons

The paper reports on the results of the study on the α decay of highly-excited states of 188Os. The experiment was performed by the time-of-flight method and neutron beam from the IBR-30 booster. For the first time one has succeeded in measuring with using of a two-section ionization chamber with a grid α-widths of (6.8±1.0)x10-9 eV and (2.0±0.3)x10-9 eV for two resonances at E0=9.47eV and E0=12.7 eV, respectively. Average α-widths were found to be (17±10)x10-9 eV and (6.3±4.7)x10-9eV over two neutron energy intervals from 38 to 53 eV and from 53 to 150 eV, respectively. Experimental α-particle strength functions are compared to those calculated within the black nucleus model. 15 refs.; 3 figs.; 2 tabs