β-delayed fission from 256Esm and the level scheme of 256Fm

Details β-delayed fission from 256Esm and the level scheme of 256Fm β-delayed fission from 256Esm and the level scheme of 256Fm

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phrvc..39.1866h&link_type=abstract

Physical Review C (Nuclear Physics), Volume 39, Issue 5, May 1989, pp.1866-1875

Physics

Nuclear Physics

33

Fission Reactions, Gamma Transitions And Level Energies, 220<=A, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The 7.6-h isotope 256Esm was produced from a 2.5-μg/cm2 target of 254Es by the (t,p) reaction. The reaction products were separated radiochemically, and the decay properties of 256Esm were determined via β-γ, γ-γ, and β-fission correlation techniques. From these measurements we were able to assign 57 γ rays to 26 levels in the daughter 256Fm. An isomeric level was observed at 1425 keV and assigned a spin and parity of 7-. This level has a t1/2 of (70+/-5) ns and we observed two β-delayed fissions with delay times in the proper time range to be associated with fission from this level. This gives a β-delayed fission probability of 2×10-5 for this level and a partial fission half-life of 0.8+8.8-0.7 ms at the 95% confidence level.

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