Photofission of 27 Al nucleus in the quasi-deuteron region of photonuclear absorption

Quasi-monochromatic photon beams of 108 MeV Compton-edge energy produced in the ROKK-1M facility at the storage ring VEPP-4M (BINP, Novosibirsk) and makrofol sheets as fission track detectors were used to measure the photofission yield of 27 Al. The fission yield was found to be .160 55 /b. From this result and previously measured 27 Al photofission yield at79 MeV end-point energy with the LADON apparatus, the trends of fission cross section and fissility have been obtained in the incident photon energy range 40-110 MeV. The present results and data for other intermediate-mass nuclei obtained with the same methodology indicate an increase of fissility with decreasing Z 2 =A as predicted by the liquid drop model for fissioning

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