Abstract
A measurement of the neutron-induced fission cross section of 230Th has been made in the neutron energy range 625 keV to 1.4 MeV with a neutron energy resolution of 5 keV. At selected energies near a prominent resonance at 715 keV, the angular distribution of fission products with respect to the neutron beam has been measured with neutron energy resolution of about 18 keV. The results are interpreted in terms of a β-vibration in the secondary minimum of the fission potential barrier and allow a direct estimate of the effective moment of inertia of the 231Th nucleus in its shape isomeric state as well as other spectroscopic information on the nuclear levels associated with this shape.
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