Angular distributions of photofission fragments of 238U in the region of the isomer shelf
Zhuchko V.E., Ignatyuk A.V., Ostapenko Yu.B., Smirenkin G.N., Soldatov A.S., Tsipenyuk Yu.M.
It is established experimentally that the photofission of 238U in the region of the isomer shelf is isotropic. This proves that the shelf in the cross section of the 238U photofission is due to spontaneous fission of the shape isomer, which corresponds to the ground state of the second well.