Abstract
A total half-life of 100·5±0·2 days and an alpha-to-spontaneous-fission decay ratio of 475±10 have been measured for 257Fm by counting in ionization chambers. Thermal-neutron fission cross sections for 257Fm (2950±160 b) and its daughter, 253Cf (1300±240 b), have been measured in a thermal-neutron column using mica as a fission-fragment track recorder.
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