Towards saturation of the electron-capture delayed fission probability : The new isotopes 240Es and 236Bk
Konki, J., Khuyagbaatar, J., Uusitalo, J., Greenlees, P., Auranen, K., Badran, H., Block, M., Briselet, R., Cox, D. M., Dasgupta, M., Nitto, A. D., Düllman, C. E., Grahn, T., Hauschild, K., Herzan, A., Herzberg, R.-D., Heßberger, F. P., Hinde, D. J., Julin, R., . . . Yakusheva, V. (2017). Towards saturation of the electron-capture delayed fission probability : The new isotopes 240Es and 236Bk. Physics Letters B, 764, 265-270. https://doi.org/10.1016/j.physletb.2016.11.038
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Physics Letters BDate
2017Copyright
© 2016 the Authors. Published by Elsevier B.V. This is an open access article under the CC BY license. Funded by SCOAP3.
The new neutron-deficient nuclei 240Es and 236Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from 240Es produced in the fusion–evaporation reaction 209Bi(34S,3n)240Es. Half-lives of 6(2) sand 22+13−6swere obtained for 240Es and 236Bk, respectively. Two groups of αparticles with energies Eα=8.19(3) MeVand 8.09(3) MeVwere unambiguously assigned to 240Es. Electron-capture delayed fission branches with probabilities of 0.16(6)and 0.04(2)were measured for 240Es and 236Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.
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Except where otherwise noted, this item's license is described as © 2016 the Authors. Published by Elsevier B.V. This is an open access article under the CC BY license. Funded by SCOAP3.