A new isotope of curium and its decay properties: 251Cm

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Abstract

The nuclide 251Cm (t12 = 16.8 ± 0.2 min) was produced by neutron capture from 250Cm with an approximate cross section of 80 barns. In the decay of 251Cm, we measured the energies and intensities of 12 γ-rays from which we constructed a level scheme for 251Bk and assigned configurations for six single-particle states in 251Bk and for the ground state of 251Cm (12)+. The levels of 251Bk fed by 251Cm β-decay are compared with those of 249Bk fed by 249Cm β-decay. We also compare our measured Qβ value of 1.42 MeV for 251Cm with previous closed-cycle estimates.

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This work was performed under the auspices of the U.S. Energy Research and Development Administration, under contract No. W-7405-Eng-48.

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