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., . . . Yakusheva, V. (2017). Towards saturation of the electron-capture delayed fission probability : The new isotopes 240Es and 236Bk. Physics Letters B, 764, 265-270. doi:10.1016/j.physletb.2016.11.038
Published inPhysics Letters B
Ward, A. |
© 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.